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A Simple Analytic Approximation for the Refracted Field at Gaussian Beam Incidence upon a Boundary of Absorbing Medium 认领 引用
1
作者 Vladimir M. Serdyuk Joseph A. Titovitsky 《Journal of Electromagnetic Analysis and Applications》 2010年第11期640-648,共9页
An approximate analytic model is presented to describe spatial structure of refracted electromagnetic field arising at oblique incidence of a Gaussian beam on a plane boundary of an absorbing homogeneous medium. The a... An approximate analytic model is presented to describe spatial structure of refracted electromagnetic field arising at oblique incidence of a Gaussian beam on a plane boundary of an absorbing homogeneous medium. The analytic solution is obtained by asymptotic approximation of a Fourier field integral under the condition of great beam width in comparison with a wavelength (the geometrical-optics approximation). This model can be used also for approximate simulation of refracted field in the cases of beam incidence near the critical angle on transparent or absorbing (amplifying) refracting medium, if one artificially introduces the additional absorption (amplification), whose value is proportional to the ratio of the wavelength and the effective beam width. It is shown that the analytic model reflects the general features of refracted field at total internal reflection. 展开更多
关键词 Gaussian Beam Refraction Absorbing Medium Total Internal Reflection
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Intraocular pressure prediction method combining finite element simulations and multi-layer perceptron neural network 认领 引用
2
作者 Shi Yan Xiaocheng Hu +2 位作者 Xiaohui Song Ke Yao Shaoxing Qu 《Acta Mechanica Sinica》 SCIE EI CAS CSCD 2026年第4期1-14,共14页
Intraocular pressure(IOP)is a key parameter to diagnose glaucoma disease and assess the treatment effect of cornea after refractive surgery.Current refractive surgeries inevitably change the configuration of the corne... Intraocular pressure(IOP)is a key parameter to diagnose glaucoma disease and assess the treatment effect of cornea after refractive surgery.Current refractive surgeries inevitably change the configuration of the cornea,making it difficult to measure IOP accurately using conventional methods.The prediction method proposed in this article can accurately measure the IOP after refractive surgery.In this study,firstly,the finite element models of cornea free of IOP depicted by various vertex height,thickness,and radius are established,and the deformation of the cornea under different IOP is predicted.Based on the dataset obtained from the numerical simulations and the multi-layer perceptron neural network algorithm,two prediction models for the vertex height and thickness of the cornea free of IOP and for the configuration under IOP are developed,and a prediction method for IOP is then proposed by combining the two models.Following the similar way,two prediction models respectively for the parameters of the presumptive initial configuration of the cornea to undergo refractive surgery and for those of the cornea after surgery are constructed,and a prediction method for IOP of cornea after the surgery is presented.The validity of the prediction methods for regular IOP and that after refractive surgery is demonstrated using the clinical data from some volunteers.The proposed methods provide an efficient prediction method for regular IOP and that after refractive surgery. 展开更多
关键词 Intraocular pressure Prediction method Refractive surgery Numerical simulations Multi-layer perceptron network
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A novel high-precision refractive index measurement scheme based on entangled coherent states and parity detection 认领 引用
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作者 HAO Li-li SONG Fu +2 位作者 LIU Xiao-yan YANG Xiao-hao WANG Qiang 《中国光学（中英文）》 EI CAS CSCD 北大核心 2026年第4期983-991,共9页
Traditional intensity-based refractive index measurement methods are constrained by the classical diffraction limit and the shot noise limit,which severely restricts the improvement of measurement precision.To address... Traditional intensity-based refractive index measurement methods are constrained by the classical diffraction limit and the shot noise limit,which severely restricts the improvement of measurement precision.To address this issue,a novel quantum measurement scheme integrating entangled coherent states(ECS)and parity detection(PD)is proposed.Taking advantage of the non-classical correlation of quantum entanglement,the scheme constructs a dual-mode entangled coherent state light source and realizes high-fidelity signal demodulation through a customized parity detection system.Theoretical derivation and numerical simulation results demonstrate that the measurement resolution of the proposed scheme breaks through the Rayleigh limit,achieving a■-fold improvement compared with the traditional coherent state measurement method in the full loss range.In lossless scenarios and cases with loss rates below 10%,the sensitivity surpasses the shot noise limit.Finally,the experimental challenges are also elaborated in detail.This quantum measurement architecture provides a new technical pathway for precision optical detection,biosensing,and other fields,exhibiting significant practical value and broad application prospects. 展开更多
关键词 refractive index measurements entangled coherent states parity detection super-resolution ultra-sensitivity
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Postoperative effective lens position and refraction changes with three different types of intraocular lens 认领 引用
4
作者 Xi-Xia Ding Lin-Feng Xiang +5 位作者 Wen-Tao Tong Dan-Dan Wang Hong-FangZhang Ping-Jun Chang Fu-Man Yang Yun-E Zhao 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2026年第2期260-265,共6页
AIM:To evaluate and compare alterations in the effective lens position(ELP)and refractive outcomes among three distinct intraocular lens(IOL)types.METHODS:Patients with cataracts were enrolled and allocated to 3 group... AIM:To evaluate and compare alterations in the effective lens position(ELP)and refractive outcomes among three distinct intraocular lens(IOL)types.METHODS:Patients with cataracts were enrolled and allocated to 3 groups:Group A(implanted with the SN6CWS),Group B(implanted with the MI60),and Group C(implanted with the Aspira-aA).ELP measurements were obtained with swept-source optical coherence tomography(SS-OCT)at 1d,1wk,1mo,and 3mo postoperatively.Subjective refraction assessments were conducted at 1wk,1mo,and 3mo following surgery.RESULTS:The study included 189 eyes of 150 cataract patients(66 males).There were 77 eyes in Group A,55 eyes in Group B,and 57 eyes in Group C.The root mean square of the ELP(ELPRMS)within the initial 3mo was significantly lower for Group A than for Groups B and C.Refractive changes within Group A were not significant across the time points of 1wk,1mo,and 3mo.Conversely,both Group B and Group C demonstrated statistically significant shifts toward hyperopia from 1wk to 3mo postsurgery.CONCLUSION:Among the three IOLs examined,the SN6CWS IOL showes the greatest stability during the first 3mo postoperatively.Between 1wk and 3mo after surgery,notable hyperopic shifts are evident in eyes implanted with the MI60 and Aspira-aA IOLs,whereas refractive outcomes remain relatively constant in eyes implanted with SN6CWS IOLs. 展开更多
关键词 effective lens position refraction intraocular lens swept-source optical coherence tomography
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Size and light scattering enhancement of sea spray aerosol via condensing fatty acid vapor 认领 引用
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作者 Minglan Xu Narcisse Tsona Tchinda +1 位作者 Siyang Li Lin Du 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第7期693-702,共10页
Once sea spray aerosol(SSA)particles are emitted into the atmosphere,they tend to interact with organic compounds and form a certain amount of organic coating on their surfaces.Here,laboratory measurements were perfor... Once sea spray aerosol(SSA)particles are emitted into the atmosphere,they tend to interact with organic compounds and form a certain amount of organic coating on their surfaces.Here,laboratory measurements were performed to investigate property changes between uncoated and coated SSA particles to assess the effect of organic coating on the surface chemistry and optical properties of nascent SSA.Stearic acid,oleic acid and mixed fatty acid were used as a proxy for coating materials and applied to aerosols produced by SSA generator.We found that the geometric mean diameter of SSA particles increased with increasing concentration of the fatty acid vapor due to higher heating temperatures,suggesting the formation of thicker coatings.Characterization by Fourier transform infrared spectroscopy and transmission electron microscope demonstrated that the SSA surface was coated with an organic coating of fatty acids,which gave the SSA a core–shell morphology.Furthermore,optical measurements by photo-acoustic extinctiometer at 375 nm revealed significantly enhanced light scattering efficiency and complex refractive index from fatty acid-coated SSA particles.The current results suggest that the fatty acid coating changes the diameter and surface composition of SSA particles,which may further impact their optical properties.It is therefore necessary to accurately characterize the overall properties of SSA particles carrying organic coatings due to condensing fatty acid vapor to reveal their overall impact on climate. 展开更多
关键词 Sea spray aerosol Organic coating Fatty acid Light scattering Complex refractive index
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High-sensitivity terahertz sensor based on four-nested ring metasurface absorber 认领 引用
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作者 WU Huijia HAO Yafeng +6 位作者 ZHU Pu MA Fupeng HUANG Yujie NIU Wenyu LI Shiqi SANG Luxiao LI Tengteng 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2026年第2期297-306,共10页
Terahertz(THz)waves exhibit distinctive advantages for biomedical sensing,while metasurface technology offers an effective route toward high-performance THz sensors.A high-sensitivity THz metasurface absorber sensor f... Terahertz(THz)waves exhibit distinctive advantages for biomedical sensing,while metasurface technology offers an effective route toward high-performance THz sensors.A high-sensitivity THz metasurface absorber sensor for biological sample detection is proposed and numerically investigated.The sensor adopts a metal-insulator-metal(MIM)configuration,in which four centrosymmetrically arranged split metal rings form a multimode resonator.Copper is employed as the metallic layer,and PTFE is selected as the dielectric spacer.The electromagnetic response of the sensor is analyzed using CST Microwave Studio based on the FIT.Simulation results demonstrate that the proposed sensor supports two independent near-perfect absorption resonances at 3.1564 THz and 3.724 THz,with peak absorption rates of 99.75%and 99.84%,respectively.Owing to the strong localized field enhancement and multimode coupling effects,the resonant frequencies exhibit pronounced sensitivity to variations in the surrounding refractive index.Within the typical refractive-index range of biomedical samples,the maximum sensitivity reaches 241 GHz/RIU,accompanied by a maximum figure of merit(FOM)of 8.02.In addition,the absorption performance remains above 99%for polarization angles from 0°to 90°,with negligible resonance shift,indicating excellent polarization insensitivity.Benefiting from the use of low-dielectric-constant materials,the proposed sensor showed good material compatibility and portability.These results suggested that the designed metasurface absorber provided a promising platform for high-sensitivity terahertz biosensing applications. 展开更多
关键词 metal-insulator-metal(MIM)configuration dual-band resonance refractive index sensing polarization insensitivity biomedical detection equivalent circuit model
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Comparative study of black carbon mixing state characterization:Evaluating Only-SP2 and CPMA-SP2 techniques for enhanced accuracy 认领 引用
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作者 Zhengyu Li Yan Peng +2 位作者 Yong Cheng Xiaofeng Huang Lingyan He 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2026年第3期568-575,共8页
Black carbon(BC)mixed with non-BC components strongly absorbs visible light and leads to uncertainty in assessing the absorption enhancement(Eabs)and thus radiative forcing.Traditional Single-Particle Soot Photomet... Black carbon(BC)mixed with non-BC components strongly absorbs visible light and leads to uncertainty in assessing the absorption enhancement(Eabs)and thus radiative forcing.Traditional Single-Particle Soot Photometer(SP2)combined with the leading-edge only fitting(the only-SP2 method)derives BC’s mixing states through Mie scattering calculations.However,errors exist in retrieved optical diameter(Dopt)and MRdue to the assumption of the ideal spherical core-shell structure and the selection of the calculation parameters like density and refractive index(RI)of the components.Here,we employed a custom-developed tandem CPMA-SP2 system,which classifies fixed-mass BC to characterize the mixing state,then compared with the only-SP2 method in quantifying the mixing state and Eabs.The field measurements show that the SP2 demonstrates variability in assessing the mixing state of BC in different aging states.The thickly-coated particles with small core approaching the internally mixed state are more sensitive to the change of calculated RI.The Doptdecreases with the RI increasing,indicating that this method accurately measures both Doptand Eabswhen a reasonable refractive index is selected for calculation.However,for thinly-coated particles with moderate or large core,this method results in significant deviations in the computed Eabs(errors up to 15%).These deviations may be caused by the various shapes of BC and systematic errors.Our results provide valuable insights into the accuracy of the SP2-retrieved Doptand MRbased on Mie calculations and highlight the importance of employing advanced techniques for further assessment of BC’s mixing state. 展开更多
关键词 Black carbon Mixing state Single-Particle Soot Photometer Refractive index Absorption enhancement
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Total score of the computer vision syndrome questionnaire predicts refractive errors and binocular vision anomalies 认领 引用
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作者 Mosaad Alhassan Tasneem Samman +5 位作者 Hatoun Badukhen Muhamad Alrashed Balsam Alabdulkader Essam Almutleb Tahani Alqahtani Ali Almustanyir 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2026年第1期90-96,共7页
AIM:To evaluate the efficacy of the total computer vision syndrome questionnaire(CVS-Q)score as a predictive tool for identifying individuals with symptomatic binocular vision anomalies and refractive errors.METHODS:A... AIM:To evaluate the efficacy of the total computer vision syndrome questionnaire(CVS-Q)score as a predictive tool for identifying individuals with symptomatic binocular vision anomalies and refractive errors.METHODS:A total of 141 healthy computer users underwent comprehensive clinical visual function assessments,including evaluations of refractive errors,accommodation(amplitude of accommodation,positive relative accommodation,negative relative accommodation,accommodative accuracy,and accommodative facility),and vergence(phoria,positive and negative fusional vergence,near point of convergence,and vergence facility).Total CVS-Q scores were recorded to explore potential associations between symptom scores and the aforementioned clinical visual function parameters.RESULTS:The cohort included 54 males(38.3%)with a mean age of 23.9±0.58y and 87 age-matched females(61.7%)with a mean age of 23.9±0.53y.The multiple regression model was statistically significant[R²=0.60,F=13.28,degrees of freedom(DF=17122,P<0.001].This indicates that 60%of the variance in total CVS-Q scores(reflecting reported symptoms)could be explained by four clinical measurements:amplitude of accommodation,positive relative accommodation,exophoria at distance and near,and positive fusional vergence at near.CONCLUSION:The total CVS-Q score is a valid and reliable tool for predicting the presence of various nonstrabismic binocular vision anomalies and refractive errors in symptomatic computer users. 展开更多
关键词 computer vision syndrome refractive errors accommodation vergence binocular vision symptoms
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Digital light processing 3D printing of ceramics for W-band gradient refractive index metalens 认领 引用
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作者 Wuzhao Li Siqian Wu +2 位作者 Jin Chen Rong Wang Qi Ge 《International Journal of Extreme Manufacturing》 SCIE EI CAS CSCD 2026年第1期601-616,共16页
Gradient refractive index(GRIN)metalenses are increasingly valued in high-frequency communication due to their exceptional radiation performance.Ceramics with high dielectric constants and low dielectric losses are id... Gradient refractive index(GRIN)metalenses are increasingly valued in high-frequency communication due to their exceptional radiation performance.Ceramics with high dielectric constants and low dielectric losses are ideal candidates for GRIN metalenses.Digital light processing(DLP)3D printing provides a feasible and efficient approach for manufacturing ceramic GRIN metalenses.However,the scattering of ultraviolet(UV)light by ceramic particles in the slurry reduces the printing accuracy of DLP technology,making it difficult to achieve the intricate structural features required for GRIN metalenses in high-frequency communication.In this work,we propose an approach to improve printing accuracy by optimizing the ceramic slurry composition and implementing a dimensional compensation design strategy.Utilizing geometric optics and the S-parameter inversion method,we design a GRIN metalens consisting of two distinct types of subwavelength unit cells(Y-shaped and circular hole geometries)with a minimum feature size of 160μm.Through a refined slurry formulation and precise design parameter compensation,high-fidelity ceramic GRIN metalenses are successfully fabricated.The fabricated metalens exhibits a maximum gain enhancement of 18.4 dBi and a deflection angle of±30°over a bandwidth of 37.84% in the W-band(75-110 GHz).The highly directional far-field beam radiation and efficient beam steering capabilities highlight the potential of ceramic GRIN metalenses for applications in satellite communications,radar systems,and other high-frequency technologies. 展开更多
关键词 3D printing ceramics digital light processing gradient refractive index metalens
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Highly sensitive,multi-stage,and mid-infrared refractive index sensor based on photonic spin Hall effect 认领 引用
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作者 Jiaye Ding Chenglong Wang +2 位作者 Shengli Liu Peng Dong Jie Cheng 《Chinese Physics B》 SCIE EI CAS CSCD 2026年第1期432-438,共7页
Surface polaritons,as surface electromagnetic waves propagating along the surface of a medium,have played a crucial role in enhancing photonic spin Hall effect(PSHE)and developing highly sensitive refractive index(RI)... Surface polaritons,as surface electromagnetic waves propagating along the surface of a medium,have played a crucial role in enhancing photonic spin Hall effect(PSHE)and developing highly sensitive refractive index(RI)sensors.Among them,the traditional surface plasmon polariton(SPP)based on noble metals limits its application beyond the near-infrared(IR)regime due to the large negative permittivity and optical losses.In this contribution,we theoretically proposed a highly sensitive PSHE sensor with the structure of Ge prism-SiC-Si:InAs-sensing medium,by taking advantage of the hybrid surface plasmon phonon polariton(SPPhP)in mid-IR regime.Here,heavily Si-doped InAs(Si:InAs)and SiC excite the SPP and surface phonon polariton(SPhP),and the hybrid SPPhP is realized in this system.More importantly,the designed PSHE sensor based on this SPPhP mechanism achieves the multi-stage RI measurements from 1.00025-1.00225 to 1.70025-1.70225,and the maximal intensity sensitivity and angle sensitivity can be up to 9.4×104μm/RIU and245°/RIU,respectively.These findings provide a new pathway for the enhancement of PSHE in mid-IR regime,and offer new opportunities to develop highly sensitive RI sensors in multi-scenario applications,such as harmful gas monitoring and biosensing. 展开更多
关键词 refractive index(RI)sensor photonic spin Hall effect mid-IR multi-stage
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Epidemiological investigative report on ocular morbidity in children in rural Kenya 认领 引用
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作者 Marlene E.Long Lily A.Nyamai +3 位作者 Marina Marinkovic Nanda Horeweg Brian W.Fleck Martine J.Jager 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2026年第1期115-122,共8页
AIM:To ascertain the pattern of ocular morbidity in a population of primary school children in rural Kenya as it is a prerequisite for planning effective preventive and therapeutic strategies.METHODS:A cross-sectional... AIM:To ascertain the pattern of ocular morbidity in a population of primary school children in rural Kenya as it is a prerequisite for planning effective preventive and therapeutic strategies.METHODS:A cross-sectional survey of ocular symptoms and clinical eye examinations were performed in a sample of 35 rural primary schools in the semi-arid region of Kajiado West sub-county in S.W.Kenya,amongst a seminomadic tribe(Maasai).Students in Grades 1-8 were included.Visual acuity was measured using the Snellen“tumbling E”chart at 6 m.Children with symptoms of refractive error underwent non-cycloplegic refraction.RESULTS:A total of 2036 children(1084 males)between the ages of 4-20y were examined.Conjunctival actinic changes were present in 22%(442/2036).Nine cases were seen with a potential squamous carcinoma.No overt classical ocular signs of vitamin A deficiency were noted,although 181(8.9%)children complained of nyctalopia.Three hundred thirty-six(16.5%)children had a visual acuity worse than 6/12 in either eye,were unable to read N10 near text at 40 cm or had symptoms suggestive of refractive error.Refractive data led to an estimate of hyperopia of+1.00 D or more in 3.9%and of myopia of-0.50 D or more in either eye in 3.0%of the study population.CONCLUSION:Solar exposure-and dust-related conjunctival pathology is common.As this may develop into potentially sight-or even life-threatening conditions,it warrants further study,and preventive strategies may be needed.Complaints of nyctalopia were common and could suggest vitamin A deficiency.The prevalence of refractive errors is low in this rural African population. 展开更多
关键词 ocular morbidity epidemiological investigation actinic conjunctival changes refractive error rural Kenyan children
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Impact of different treatment approaches on longterm refractive and visual outcomes in retinopathy of prematurity 认领 引用
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作者 Osman Kizilay Ahmad Kunbaz +2 位作者 Ozge Pinar Akarsu Acar Murat Gunay Gokhan Celik 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2026年第6期1107-1116,共10页
AIM:To evaluate the long-term refractive and visual outcomes in infants with retinopathy of prematurity(ROP)treated with intravitreal bevacizumab(IVB),laser photocoagulation(LPC),or combined IVB+LPC therapy,and to ass... AIM:To evaluate the long-term refractive and visual outcomes in infants with retinopathy of prematurity(ROP)treated with intravitreal bevacizumab(IVB),laser photocoagulation(LPC),or combined IVB+LPC therapy,and to assess disease severity on refractive development over five years.METHODS:This retrospective cohort study analyzed data from infants diagnosed with ROP between 2013 and 2018.Patients were categorized into four groups:IVB(n=44),LPC(n=41),IVB+LPC(n=17),and regressed ROP(RROP,n=50).A subgroup analysis was performed for Type 1 ROP and aggressive ROP(AROP).Primary outcomes included spherical equivalent(SE),astigmatism,and visual acuity(logMAR),measured at 6-month intervals up to 60mo.RESULTS:The study included 152 patients(76 females).The mean birth weight was 1256.1±555.6 g,and the mean week of birth was 29.1±2.9wk.RROP infants had the highest SE,closest to emmetropia.The IVB+LPC group showed the most significant myopic shift compared to other groups(P<0.05).In Type 1 ROP,SE was lower in the IVB+LPC group initially,but by 60mo,the difference was not significant.Astigmatism was higher in the LPC group at later time points(36–60mo).However,no differences in visual acuity were observed at the final follow-up among treatment groups.CONCLUSION:Refractive outcomes vary more in Type 1 ROP than AROP.IVB+LPC results in greater myopia;LPC is associated with increased astigmatism.Individualized refractive follow-up is essential,particularly for Type 1 ROP. 展开更多
关键词 retinopathy of prematurity refractive error regressed retinopathy of prematurity intravitreal bevacizumab laser photocoagulation
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Bilingual evaluation of large language models for patient education in refractive surgery 认领 引用
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作者 Tsung-Hsien Tsai Chin-Ling Tsai +2 位作者 Jui-Hung Hsu Ching-Hsi Hsiao Hung-Chi Chen 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2026年第6期1019-1027,共9页
AIM:To evaluate the ability of six advanced large language models(LLMs)—in providing accurate,comprehensive,and readable patient education on corneal refractive surgeries[laser in-situ keratomileusis(LASIK),keratoref... AIM:To evaluate the ability of six advanced large language models(LLMs)—in providing accurate,comprehensive,and readable patient education on corneal refractive surgeries[laser in-situ keratomileusis(LASIK),keratorefractive lenticule extraction(KLEx),and photorefractive keratectomy(PRK)]in both English and Chinese.METHODS:This is a cross-sectional,comparative study.Twenty-six questions,compiled from authoritative ophthalmologic sources and covering four domains(procedure basics and eligibility;safety,risks and longterm stability;recovery and postoperative experience;and practical concerns),were administered in both English and Chinese via fresh chat sessions with each LLM,respectively.Five performance metrics were evaluated:accuracy,comprehensiveness,word count,readability,and reproducibility,using appropriate statistical tests.RESULTS:OpenAI o1 and DeepSeek-R1 consistently achieved the highest accuracy and most comprehensive responses,significantly outperforming ChatGPT-4o,Gemini Advanced,Claude Sonnet,and Tongyi Qwen(Friedman P<0.001).Although overall accuracy and comprehensiveness were similar across languages,Chinese responses were significantly longer.Readability varied among the models,with Claude Sonnet generally producing the most readable English texts.Reproducibility analysis revealed moderate consistency,reflecting inherent variability in outputs to identical prompts.CONCLUSION:Reasoning-augmented LLMs,particularly OpenAI o1 and DeepSeek-R1,demonstrate superior performance in delivering bilingual patient education for corneal refractive surgery,with high accuracy and comprehensiveness.However,variations in response length,readability,and reproducibility indicate that further refinement is necessary before these tools can be reliably integrated into clinical practice. 展开更多
关键词 large language models refractive surgery patient education
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A plethora of optical solitons and other exact solutions for NLSE with Kudryashov's refractive index using improved modified extended tanh function method 认领 引用
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作者 Islam Samir Hamdy M.Ahmed Mohammad Mirzazadeh 《Applied Mathematics(A Journal of Chinese Universities)》 SCIE CSCD 2026年第2期328-339,共12页
The nonlinear Schrödinger’s equation(NLSE)with Kudryashov’s refractive index which describes the wave dynamics through optical fibers is investigated.The literature review of the previous works are introduced t... The nonlinear Schrödinger’s equation(NLSE)with Kudryashov’s refractive index which describes the wave dynamics through optical fibers is investigated.The literature review of the previous works are introduced to exhibit the motivation and the importance of this work.In addition,the integration technique of the improved modified extended tanh function scheme is applied on the investigated model to derive various and novel solutions.These solutions are bright,dark and singular solitons.In addition,Weierstrass elliptic,singular periodic,exponential and rational type solutions are derived.It needs to be noted that this governing model can be useful for description of physical processes in nonlinear optics and also the results revealed for the equation are new and originally reported in the present work for the first time.Moreover,the graphical representations of some solutions are depicted to show the powerful and the characteristics of them. 展开更多
关键词 optical solitons NLSE Kudryashov's form refractive index
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Photonic chip material refractive index extraction with a single photonic crystal micro-ring resonator 认领 引用
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作者 Yong Hu Jiaxin Gu +3 位作者 Yan Zhang Qingyang Du Chenhui Li Shaoliang Yu 《Advanced Photonics Nexus》 CSCD 2026年第3期111-117,共7页
As co-packaged optics(CPO)integrates photonic chips and electronic dies together,accurate and non-destructive post-fabrication characterization of waveguide parameters—width,thickness,and the refractive indices of bo... As co-packaged optics(CPO)integrates photonic chips and electronic dies together,accurate and non-destructive post-fabrication characterization of waveguide parameters—width,thickness,and the refractive indices of both core and cladding—becomes critical,because even minute index deviations are amplified in dense interconnects and directly impair the signal integrity and energy efficiency of CPO modules.We take the material refractive index as an example and demonstrate an effective approach for non-destructive parameter extraction of the as-fabricated optical waveguide with a single photonic crystal ring resonator.By lifting the degeneracy of the symmetric and anti-symmetric resonant peak,this single structure suffices to determine the core and clad indices rapidly with high precision.We successfully applied the extracted parameter of the refractive indices to validate the optical transmission of the indexesensitive wavelength division multiplexer device.Our approach has provided a facile solution for postfabrication device parameter evaluation and is readily extendable to geometric parameters. 展开更多
关键词 refractive index measurement photonic crystal micro-ring integrated photonics
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Integrative analytical and statistical framework for optimization of multiplex qPCR detection of TGFBI mutations in refractive surgery candidates 认领 引用
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作者 Yunfeng GU Liping MAO +7 位作者 Xiaoling LI Kangxuan SUN Qiuruo JIANG Wenhui WU Yangyang SHEN Shihao CHEN Meiqin ZHENG Yi XU 《Journal of Zhejiang University-SCIENCE B》 SCIE CAS CSCD 2026年第6期645-655,I0019-I0026,共11页
Refractive surgery can unmask or accelerate transforming growth factor-β-induced(TGFBI)-related corneal dystrophies that are undetectable by routine slit-lamp examination,creating a clear need for a rapid,standardize... Refractive surgery can unmask or accelerate transforming growth factor-β-induced(TGFBI)-related corneal dystrophies that are undetectable by routine slit-lamp examination,creating a clear need for a rapid,standardized,preoperative genetic screening.We developed a multiplex,allele-specific real-time quantitative polymerase chain reaction(qPCR)panel targeting five high-frequency TGFBI hotspots(R124C/L/H,R555W/Q)and built a statistics-driven analytical framework to optimize assay decisions.Receiver operating characteristic(ROC)analysis defined locus-specific cycle threshold(CT)cut-offs that were harmonized to a single decision threshold(CT=36)to simplify deployment.Analytical sensitivity was established by Probit modeling of serial two-fold dilutions,and confirmed by≥20 replicates per level.In a 158-sample validation set(38 mutation-positive;120 negative),qPCR agreed perfectly with Sanger sequencing(Cohen’s kappa coefficient(κ)=1.0).Probit analysis yielded locus-specific limit of detection(LoD)values ranging from 0.035 to 0.200 ng/μL;at 0.200 ng/μL,the detection rate was over 95%.Repeatability and intermediate precision were high(CT coefficient of variation(CV)0.34%-1.21%).No cross-reactivity was observed against non-target TGFBI variants or other ophthalmic genes,and interference from blood,oral florainse,or toothpaste produced small,bounded shifts(approximately−7.8%to+2.8%).Calibration with serial dilutions demonstrated linear CT-log(copy)relationships suitable for routine quality control.Prospective screening of 10055 refractive surgery candidates identified six TGFBI carriers(0.06%)harboring R124H(including one homozygote),R124L,R124C,or R555W mutation,all confirmed by Sanger sequencing.This study established a clinically applicable,statistically optimized multiplex qPCR platform that integrated ROC-derived cut-offs and Probit-defined LoD with rigorous evaluations of precision,specificity,and robustness,enabling large-scale population implementation.Positive screening results guide clinical decision-making through a standardized post-screening workflow,and the targeted hotspot screening strategy serves as a cost-effective first-tier high-throughput approach for preoperative risk assessment.The framework provides a transparent,reproducible path to standardize preoperative TGFBI screening and reduce iatrogenic risk in refractive surgery candidates. 展开更多
关键词 Multiplex real-time quantitative polymerase chain reaction(qPCR) Transforming growth factor-β-induced(TGFBI)mutation Preoperative genetic screening Probit regression analysis Refractive surgery
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High-sensitivity dual-polarization four-channel SPR refractive index sensor with wide detection range and high linearity based on PCF 认领 引用
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作者 Nan CUI Honggang PAN +3 位作者 Ailing ZHANG Zihong ZHAO Zhipan CHEN Bo ZHANG 《Optoelectronics Letters》 EI 2026年第2期71-76,共6页
In this paper,we propose and numerically characterize the optical characteristics of a high-sensitivity dual-polarization four-channel surface plasmon resonance(SPR)refractive index sensor with wide detection range an... In this paper,we propose and numerically characterize the optical characteristics of a high-sensitivity dual-polarization four-channel surface plasmon resonance(SPR)refractive index sensor with wide detection range and high linearity based on photonic crystal fiber(PCF).Four light transmission channels are constructed by using big air holes.The small rectangular air hole in the center of the fiber core is used to add asymmetry.We use gold plasma material to achieve better sensing performance.A thin film of TiO2 is placed on the PCF surface,which assists gold in the adhesion on PCF.The maximum wavelength sensitivity of the sensor can reach 20000 nm/RIU in both x and y polarization modes.While the maximum wavelength resolution of the sensor is 5×10-6 RIU.The average wavelength sensitivity reached 15900 nm/RIU and 15800 nm/RIU in x and y polarization modes.The sensor features R2=0.9969/R2=0.9966 high linear performance in x and y polarization modes and the maximum figure of merit(FOM)values of 509.13 RIU-1/489.63 RIU-1 in x and y polarization modes.Besides,the sensor's detection range is 1.26–1.36,which is a wide refractive index detection range. 展开更多
关键词 gold plasma material big air holesthe fiber core light transmission channels surface plasmon resonance spr refractive characterize optical characteristics thin film ti air hole
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Fiber-optic microstructured sensors based on abrupt field patterns: theory, fabrication, and applications 认领 引用
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作者 Yuxuan Yi Wanlai Zhu +4 位作者 Zao Yi Zigang Zhou Shubo Cheng Majid Niaz Akhtar Sohail Ahmad 《Opto-Electronic Science》 CAS 2026年第1期13-31,共19页
Fiber-optic sensing technology has the advantages of passivity, anti-electromagnetic interference, longdistancemeasurement, high sensitivity and high accuracy, small size, and adaptability to harsh environments such a... Fiber-optic sensing technology has the advantages of passivity, anti-electromagnetic interference, longdistancemeasurement, high sensitivity and high accuracy, small size, and adaptability to harsh environments such ashigh-vacuum, high-pressure, and strong magnetic fields compared with the traditional electrical sensing technology.However, with the increasing application requirements, how to further improve the sensitivity of fiber-optic sensors,extend the detection limit and improve the maintenance-free capability has become one of the core issues of thecurrent research. This paper reviews the principle, preparation, and application of fiber-optic microstructured sensingbased on abrupt field type. It specifically outlines the development and applications of micro-nano optical fibers,photonic crystal optical fibers, optical fiber gratings and structured optical fibers, and lists the main preparationmethods of two types of micro-nano optical fibers from the basic theory of optical fiber microstructured sensordevices. 展开更多
关键词 fiber-optic microstructure sensing sudden field-type fiber-optic microstructure devices fiber-optic refractive index sensors micro-and nanofibers Wiener fiber preparation
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Visual outcomes of implantable Collamer lens and laserassisted in situ keratomileusis for all levels of myopia 认领 引用
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作者 Tsetsegjargal Baasanjav Davaalkham Dambadarjaa +1 位作者 Baasankhuu Jamyanjav Uranchimeg Davaatseren 《International Journal of Ophthalmology(English edition)》 SCIE CAS 2026年第6期1124-1131,共8页
AIM:To compare the clinical outcomes of the current V4c model of the myopic implantable Collamer lens(ICL)with those of laser in situ keratomileusis(LASIK)for the correction of myopia ranging from−2.0 to−18.0 diopters... AIM:To compare the clinical outcomes of the current V4c model of the myopic implantable Collamer lens(ICL)with those of laser in situ keratomileusis(LASIK)for the correction of myopia ranging from−2.0 to−18.0 diopters(D).METHODS:This prospective,non-randomized study enrolled participants who underwent either LASIK or implantation of the ICL V4c at Bolor Melmii Eye Hospital.In the LASIK group,participants received Intralase LASIK(I-LASIK)using the Intralase FS-200 femtosecond laser and the MEL-80 excimer laser.Each group comprised the same number of participants and eyes(38 participants,73 eyes).RESULTS:A total of 146 eyes from 76 participants were analyzed.Among the LASIK group,76.3%were female,with a mean age at surgery of 29.76±5.95y(range,20–43y).In the ICL group,92.1%were female,with a mean age of 31.59±8.32y(range,20–49y).Preoperative best-corrected visual acuity(BCVA)did not differ significantly between the LASIK and ICL groups(P=0.68).Postoperatively,the ICL group consistently demonstrated better BCVA(20/20 or better)at all follow-up points,with statistically significant differences observed at 1d(56.2%vs 30.1%,P=0.003)and 3mo(54.8%vs 32.9%,P=0.012).The mean BCVA improvement also favored the ICL group for up to 6mo postoperatively.A higher proportion of eyes in the ICL group achieved uncorrected distance visual acuity(UDVA)of 20/20 or better at 1mo(50.7%vs 41.1%,P=0.319)and 6mo(57.5%vs 43.8%,P=0.136),although these differences were not statistically significant.Predictability was comparable between the groups,except at 6mo,where fewer ICL-treated eyes were within±0.5 D of the intended correction(49.3%vs 64.4%,P=0.094).Nevertheless,both groups achieved identical outcomes within±1.0 D(90.4%,P=1.000).Between 1 and 6mo,78.1%of eyes in the ICL group showed a change in spherical equivalent refraction of no more than 0.5 D,compared to 65.8%in the LASIK group.Refraction stability,defined as a change of less than 1.0 D,remained good in both groups throughout all followup periods.CONCLUSION:Both LASIK and ICL implantation leads to significant improvements in visual outcomes,with early postoperative gains observed in both groups.However,the ICL group demonstrates greater long-term improvement in BCVA compared to the LASIK group,particularly among participants with higher degrees of myopia.Visual outcomes in both groups stabilized by 6mo postoperatively. 展开更多
关键词 laser in situ keratomileusis implantable Collamer lens best corrected visual acuity manifest refractive spherical equivalent
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Safety and efficacy of keratorefractive surgery in diabetes mellitus:A clinical review 认领 引用
20
作者 Ranjan Kumar Behera Parul Chawla Gupta +1 位作者 Arvind Kumar Morya Srishti Khullar 《World Journal of Clinical Cases》 2026年第4期1-11,共11页
Keratorefractive surgery is typically performed to correct refractive errors,resulting in good postoperative outcomes.Certain conditions,such as autoimmune diseases,metabolic diseases like diabetes mellitus(DM),and th... Keratorefractive surgery is typically performed to correct refractive errors,resulting in good postoperative outcomes.Certain conditions,such as autoimmune diseases,metabolic diseases like diabetes mellitus(DM),and the use of some drugs,may be absolutely or relatively contraindicated for refractive surgery.DM is a multisystemic disorder affecting various organs and can result in retinopathy,nephropathy,and neuropathy.Persistent hyperglycemia leads to various pathophysiological changes that can alter the biomechanical profile and the wound healing process of the cornea.Proper patient counselling,optimizing blood glucose levels,and frequent follow-up visits to monitor and manage potential complications,such as dry eye,non-healing epithelial defects,and neurotrophic keratitis,are essential for refractive surgeons.Laser-assisted in situ keratomileusis is preferred over photorefractive keratectomy due to its faster healing process.Cataract surgery in people with diabetes warrants various preoperative,intraoperative,and postoperative considerations for the best visual outcomes.This review focuses on the current evidence pertaining to various structural and functional corneal changes occurring in diabetics and their impact on keratorefractive procedures,thus providing a unified,clinically oriented framework to guide refractive surgeons in risk stratification,procedure selection,and postoperative management in patients with DM. 展开更多
关键词 Diabetes mellitus Refractive surgery Diabetic keratopathy Photorefractive keratectomy Advanced glycation end products
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