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Finite difference time domain method forward simulation of complex geoelectricity ground penetrating radar model 认领 引用 被引量：7
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作者 DAI Qian-wei FENG De-shan HE Ji-shan 《Journal of Central South University of Technology》 2005年第4期478-482,共5页
The ground penetrating radar(GPR)forward simulation all aims at the singular and regular models,such as sandwich model,round cavity,square cavity,and so on,which are comparably simple.But as to the forward of curl int... The ground penetrating radar(GPR)forward simulation all aims at the singular and regular models,such as sandwich model,round cavity,square cavity,and so on,which are comparably simple.But as to the forward of curl interface underground or“v”figure complex model,it is difficult to realize.So it is important to forward the complex geoelectricity model.This paper takes two Maxwell’s vorticity equations as departure point,makes use of the principles of Yee’s space grid model theory and the basic principle finite difference time domain method,and deduces a GPR forward system of equation of two dimensional spaces.The Mur super absorbed boundary condition is adopted to solve the super strong reflection on the interceptive boundary when there is the forward simulation.And a self-made program is used to process forward simulation to two typical geoelectricity model. 展开更多
关键词 ground penetrating radar finite difference time domain method forward simulation ideal frequency dispersion relationship
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Numerical Solutions of Finite Well in Two Dimensions Using the Finite Difference Time Domain Method 认领 引用
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作者 Huwaida K.Elgweri Amal Hamed Mohamed Mansor 《Journal of Physical Science and Application》 2022年第1期12-18,共7页
The higher excited states for two dimensional finite rectangular well potential are calculated numerically,by solving the Schrödinger equation using the finite difference time domain method.Although,this method i... The higher excited states for two dimensional finite rectangular well potential are calculated numerically,by solving the Schrödinger equation using the finite difference time domain method.Although,this method is suitable to calculate the ground state of the quantum systems,it has been improved to calculate the higher excited states directly.The improvement is based on modifying the iterative process involved in this method to include two procedures.The first is known as cooling steps and the second is known as a heating step.By determining the required length of the cooling iteration steps using suitable excitation energy estimate,and repeating these two procedures using suitable initial guess function for sufficient times.This modified iteration will lead automatically to the desired excited state.In the two dimensional finite rectangular well potential problem both of the suitable excitation energy and the suitable initial guess wave function are calculated analytically using the separation of variables technique. 展开更多
关键词 Finite difference time domain method diffusion equation separation of variables method finite well potential Schrödinger equation
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Finite-difference time-domain studies of low-frequency stop band in superconductor-dielectric superlattice 认领 引用 被引量：1
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作者 王身云 刘少斌 Le-Wei Joshua Li 《Chinese Physics B》 SCIE EI CAS 2010年第8期374-378,共5页
The transmission coefficients of electromagnetic （EM） waves due to a superconductor-dielectric superlattice are numerically calculated. Shift operator finite difference time domain （SO-FDTD） method is used in the ... The transmission coefficients of electromagnetic （EM） waves due to a superconductor-dielectric superlattice are numerically calculated. Shift operator finite difference time domain （SO-FDTD） method is used in the analysis. By using the SO-FDTD method, the transmission spectrum is obtained and its characteristics are investigated for different thicknesses of superconductor layers and dielectric layers, from which a stop band starting from zero frequency can be apparently observed. The relation between this low-frequency stop band and relative temperature, and also the London penetration depth at a superconductor temperature of zero degree are discussed, separately. The low-frequency stop band properties of superconductor-dielectric superlattice thus are well disclosed. 展开更多
关键词 shift operator finite difference time domain method superconductor superconductor- dielectric superlattice high-pass filter
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Spectral Multipole Resonances of Super Elliptic Gold Nanoparticles in the Visible and Near-Infrared Spectral Ranges 认领 引用
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作者 Linkang Wang Bowei Xie +2 位作者 Zhiqiang Liu Lijing Yi Mu Du 《Frontiers in Heat and Mass Transfer》 EI CAS 2026年第2期196-206,共11页
The Local Surface Plasma Resonance(LSPR)of spherical metal particles is typically only observed within the visible spectrum.This inherent property renders modulation through alterations in radius or material challengi... The Local Surface Plasma Resonance(LSPR)of spherical metal particles is typically only observed within the visible spectrum.This inherent property renders modulation through alterations in radius or material challenging,significantly constraining its practical applications.In this work,we propose a super-elliptic gold nanoparticle model that allows for the continuous modulation of particle geometry from spherical to star-like shapes using a single roundness parameter(e).Unlike conventional nanorods or discrete nanostars,this geometry provides a unified framework to investigate the evolution of multipole resonances.The radiation characteristics of super elliptic gold nanoparticles in the range of 0.3~2.5μm were calculated by using the Finite Difference Time Domain method.The present study investigates the effects of the particle roundness parameter and particle size on the LSPR response.The results demonstrated that an augmentation in the particle roundness parameter resulted in a substantial enhancement of the absorption efficiency of the particles.Concurrently,a discernible red shift in the LSPR peaks was observed within the visible light spectrum.A greater prevalence of LSPR peaks was observed in the visible and near infrared band for the super elliptical gold nanoparticles with large roundness parameter.Super-elliptical particles have been observed to exhibit multiple plasmonic absorption peaks,in contrast to the more typical behaviour of conventional noble metal particles,which typically exhibit only one or two such peaks.The effect of the roundness parameter on the local surface plasma resonance response of nanoparticles of varying sizes is consistent.The super elliptic gold nanoparticles have potential applications in the fields of solar heating,radiative cooling,biomedical and photocatalysis. 展开更多
关键词 Super elliptic nanoparticles finite difference time domain method local surface plasma resonance
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A wavelet multiscale method for inversion of Maxwell equations 认领 引用 被引量：1
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作者 丁亮 韩波 刘家琦 《Applied Mathematics and Mechanics(English Edition)》 SCIE EI 2009年第8期1035-1044,共10页
This paper is concerned with estimation of electrical conductivity in Maxwell equations. The primary difficulty lies in the presence of numerous local minima in the objective functional. A wavelet multiscale method is... This paper is concerned with estimation of electrical conductivity in Maxwell equations. The primary difficulty lies in the presence of numerous local minima in the objective functional. A wavelet multiscale method is introduced and applied to the inversion of Maxwell equations. The inverse problem is decomposed into multiple scales with wavelet transform, and hence the original problem is reformulated to a set of sub-inverse problems corresponding to different scales, which can be solved successively according to the size of scale from the shortest to the longest. The stable and fast regularized Gauss-Newton method is applied to each scale. Numerical results show that the proposed method is effective, especially in terms of wide convergence, computational efficiency and precision. 展开更多
关键词 Maxwell equations wavelet Gauss-Newton method finite difference time multiscale method inversion regularized domain method
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High Precision Time Domain Forward Modeling for Crosshole Electromagnetic Tomography 认领 引用 被引量：2
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作者 林树海 赵立英 《Journal of China University of Geosciences》 2007年第4期320-325,共6页
To improve the resolution of crosshole electromagnetic tomography, high precision of forward modeling is necessary. A pseudo-spectral time domain （PSTD） forward modeling was used to simulate electromagnetic wave pro... To improve the resolution of crosshole electromagnetic tomography, high precision of forward modeling is necessary. A pseudo-spectral time domain （PSTD） forward modeling was used to simulate electromagnetic wave propagation between two boreholes. The PSTD algorithm is based on the finite difference time domain （FDTD） method and uses the fast Fourier transform （FFT） algorithm for spatial derivatives in Maxwell＇s equations. Besides having the strongpoint of the FDTD method, the calculation precision of the PSTD algorithm is higher than that of the FDTD method under the same calculation condition. The forward modeling using the PSTD method will play an important role in enhancing the resolution of crosshole electromagnetic tomography. 展开更多
关键词 finite difference time domain method pseudo.spectral time domain algorithm forward modeling tomography.
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A novel method for calculating broadband electrical performance of high-speed aircraft radome under thermo-mechanical-electrical coupling 认领 引用 被引量：4
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作者 Jianmin JI Jianhua REN +4 位作者 Xunya JIANG Wei WANG Huilong YU Kai YIN Bo CHEN 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2024年第9期463-474,共12页
The electrical performance of radomes on high-speed aircraft can be influenced by the thermal and mechanical loads produced during high-speed flight,which can affect the detection dis-tance and accuracy of the guidanc... The electrical performance of radomes on high-speed aircraft can be influenced by the thermal and mechanical loads produced during high-speed flight,which can affect the detection dis-tance and accuracy of the guidance system.This paper presents a new method that uses the Finite Difference Time Domain(FDTD)method to calculate the electrical performance of radomes under Thermo-Mechanical-Electrical(TME)coupling.This method can accurately characterize the effects of material dielectric temperature drift and structural deformation on the electrical performance of the radome under flight conditions,enabling high-precision full-wave calculations of the broadband electrical performance of the radome.The method initiates by utilizing a Finite Element Grid Model(FE-GM)of the radome to sequentially acquire the radome's response temperature field and structural deformation field through thermal and mechanical simulations.Subsequently,spatial mapping techniques are developed to accurately incorporate the dielectric temperature drift and structural deformation of the radome into its Yee grid Electromagnetic(EM)simulation model.A verification case was designed to test the proposed method,and the results confirmed its high computational accuracy.Additionally,the effectiveness and necessity of the method were further demonstrated by analyzing the electrical performance of a fused silica ceramic radome used on a high-speed aircraft. 展开更多
关键词 High-speed aircraft Radomes Thermo-Mechanical-Electrical(TME)coupling Finite Difference Time Domain(FDTD)method Spatial mapping
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Design of the sample cell in near-field surface-enhanced Raman scattering by finite difference time domain method 认领 引用 被引量：2
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作者 李亚琴 简国树 吴世法 《Chinese Optics Letters》 EI CAS 2006年第11期671-674,共4页
The rational design of the sample cell may improve the sensitivity of surface-enhanced Raman scattering （SERS） detection in a high degree. Finite difference time domain （FDTD） simulations of the configuration of A... The rational design of the sample cell may improve the sensitivity of surface-enhanced Raman scattering （SERS） detection in a high degree. Finite difference time domain （FDTD） simulations of the configuration of Ag film-Ag particles illuminated by plane wave and evanescent wave are performed to provide physical insight for design of the sample cell. Numerical solutions indicate that the sample cell can provide more ＂hot spots＂ and the massive field intensity enhancement occurs in these ＂hot spots＂. More information on the nanometer character of the sample can be got because of gradient-field Raman （GFR） of evanescent wave. OCIS codes： 290.5860, 240.0310, 240.6680, 999.9999 （surface-enhanced Raman scattering）. 展开更多
关键词 Design of the sample cell in near-field surface-enhanced Raman scattering by finite difference time domain method Ag SERS time
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基于WVD/ATDM的铝合金板孔损伤位置与区域识别 认领 引用
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作者 徐建新 宋旭东 武耀罡 《中国民航大学学报》 CAS 2022年第1期53-59,共7页
为识别铝合金板孔损伤位置及区域,以Lamb波为研究基础,提出基于魏格纳-威利分布(WVD,WignerVille distribution)和到达时间差值法(ATDM,arrival time difference method)的损伤识别技术。首先,采集实验铝合金板健康和有损模型的Lamb信号... 为识别铝合金板孔损伤位置及区域,以Lamb波为研究基础,提出基于魏格纳-威利分布(WVD,WignerVille distribution)和到达时间差值法(ATDM,arrival time difference method)的损伤识别技术。首先,采集实验铝合金板健康和有损模型的Lamb信号,对其差值信号进行WVD分析,准确提取损伤反射信号到达时间;其次,通过ATDM建立各传感器间的距离差值关系,确定孔损伤位置中心并预测最大损伤半径,从而实现对孔损伤关键指标的识别;最后,通过数值模拟进一步验证该方法,结果表明,基于WVD/ATDM的损伤识别技术不仅能准确识别出孔损伤位置,而且能够有效地识别损伤区域面积。 展开更多
关键词 铝合金板 Lamb波 WVD(Wigner-Ville distribution)/ATDM(arrival time difference method)方法 孔损伤 位置识别 区域识别
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A high quality factor photonic crystal channel-drop filter with a linear gradient microcavity 认领 引用 被引量：2
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作者 李传起 范庆斌 +3 位作者 陆叶 罗德俊 孔一卜 张东闯 《Optoelectronics Letters》 EI 2015年第3期174-178,共5页
We design a channel-drop filter(CDF)with a linear gradient microcavity in a two-dimensional(2D)photonic crystal(PC).The model of three-port CDF with reflector is used to achieve high quality factor(Q-factor)and 100%ch... We design a channel-drop filter(CDF)with a linear gradient microcavity in a two-dimensional(2D)photonic crystal(PC).The model of three-port CDF with reflector is used to achieve high quality factor(Q-factor)and 100%channel-drop efficiency.The research indicates that adjusting the distance between reference plane and reflector can simultaneously influence the Q-factor due to coupling to a bus waveguide and the phase retardation occurring in the round trip between a microcavity and a reflector.The calculation results of 2D finite-difference time-domain(FDTD)method show that the designed filter can achieve the drop efficiency of 96.7%and ultra-high Q-factor with an ultra-small modal volume. 展开更多
关键词 Drops Finite difference time domain method Microcavities Photonic crystals Power inductors Q factor measurement Reflection
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Study on a novel photonic crystal temperature sensor 认领 引用 被引量：1
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作者 傅海威 赵辉 +3 位作者 乔学光 李岩 赵大壮 雍振 《Optoelectronics Letters》 EI 2011年第6期419-422,共4页
In this paper, a model of photonic crystal temperature sensor based on crystal microcavity in a straight photonic crystal waveguide is proposed. The transmission characteristics of light in the sensor under different ... In this paper, a model of photonic crystal temperature sensor based on crystal microcavity in a straight photonic crystal waveguide is proposed. The transmission characteristics of light in the sensor under different temperatures are simulated by using finite-difference time-domain (FDTD) method. The thermal expansion and thermal-optic effects of silicon are taken into account. The results show that the resonant wavelength of microcavity increases linearly as the temperature rising. The wavelength shift along with temperature is 6.6 pm /℃. 展开更多
关键词 Finite difference time domain method Light transmission Microcavities Temperature sensors Thermal expansion Time domain analysis
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Design of ultra-compact wavelength splitter based on lithium niobate nanowire optical waveguides 认领 引用 被引量：4
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作者 陈明 刘子晨 《Optoelectronics Letters》 EI 2012年第1期17-20,共4页
A wavelength splitter with ultra-compact and simple structure is proposed and analyzed by using both plane wave expansion （PWE） method and finite difference time domain （FDTD） method. The device is based on direct... A wavelength splitter with ultra-compact and simple structure is proposed and analyzed by using both plane wave expansion （PWE） method and finite difference time domain （FDTD） method. The device is based on directional coupling between two parallel lithium niobate （LiNbO3, LN） nanowire optical waveguides. The wavelength splitter with a coupling region length of 5 um can separate 1.3 um and 1.55 um wavelengths for corresponding outputs with transmittance higher than 97%. 展开更多
关键词 Finite difference time domain method Nanowires
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Optimizing bowtie structure parameters for specific incident light 认领 引用 被引量：1
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作者 王乔 吴世法 +1 位作者 李旭峰 王晓钢 《Chinese Physics B》 SCIE EI CAS 2010年第11期588-592,共5页
We investigate optical properties of a bowtie-shaped aperture using the finite difference time domain method to optimize its geometric parameters for specific incident lights. The influence of the parameters on local ... We investigate optical properties of a bowtie-shaped aperture using the finite difference time domain method to optimize its geometric parameters for specific incident lights. The influence of the parameters on local field enhancement and resonant wavelength in the visible frequency range is numerically analysed. It is found that the major resonance of the spectrum is exponentially depended on the bowtie angle but independent of the whole aperture size. The simulation also demonstrates that increasing the aperture size raises the local field intensity on the exit plane due to an enlarged interaction area between the light and the metal medium. And the near-field spot size is closely related to the gap. Based on these results, the design rules of the bowtie structure can be optimized for specific wavelengths excited. 展开更多
关键词 bowtie aperture localized surface plasmons finite difference time domain method
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Modeling transmittance through submicron silver slit arrays 认领 引用 被引量：1
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作者 王爱华 蔡九菊 陈玉彬 《Journal of Central South University》 SCIE EI CAS 2012年第8期2107-2114,共8页
Mid-infrared transmittance of submicron silver slit arrays was numerically studied with the finite difference time domain method. The slit width varies from 50 nm to 300 nm and a square feature may attach at either or... Mid-infrared transmittance of submicron silver slit arrays was numerically studied with the finite difference time domain method. The slit width varies from 50 nm to 300 nm and a square feature may attach at either or both slit sides. Although the side length of features is one or two orders of magnitude shorter than the wavelength, the attached nanoscale features can modify the transmittance significantly. The transmittance was also further investigated in detail by looking into the electromagnetic fields and Poynting vectors of selected slit geometries. The investigation results show that such change can be attributed to the cavity resonance effect inside the slit arrays. The work is of great importance to the wavelength-selective devices design in optical devices and thermal application fields. 展开更多
关键词 finite difference time domain method transmittance silver slit array cavity resonance effect
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Numerical investigation of the enhanced unidirectional surface plasmon polaritons generator 认领 引用 被引量：1
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作者 张志东 王红艳 +1 位作者 张中月 王辉 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第1期432-436,共5页
A unidirectional surface plasmon polaritons(SPPs) generator with greatly enhanced generation efficiency is proposed. The SPPs generator consists of an asymmetric single nanoslit coated with a polyviny alcohol(PVA) fil... A unidirectional surface plasmon polaritons(SPPs) generator with greatly enhanced generation efficiency is proposed. The SPPs generator consists of an asymmetric single nanoslit coated with a polyviny alcohol(PVA) film and a silver rectangle block. The generation efficiency of this SPPs generator is investigated using the finite difference time domain method. Due to the presence of the silver rectangle block, the SPPs generation efficiency of the asymmetric single nanoslit with PVA film can be greatly enhanced and the corresponding wavelength with the maximum enhancement factor can be tuned flexibly. The influence of the structural parameters on the generation efficiency is also investigated for the enhanced unidirectional SPPs generator. 展开更多
关键词 surface plasmon polariton surface plasmon polaritons(SPPs) generator asymmetric single-slit finite difference time domain method
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Terahertz polarization beam splitter based on photonic crystal and multimode interference 认领 引用 被引量：1
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作者 刘汉 李九生 《Optoelectronics Letters》 EI 2014年第5期325-328,共4页
We design a compact terahertz(THz) polarization beam splitter. Both plane wave expansion method and finite-difference time-domain method are used to calculate and analyze the characteristics of the proposed device. Th... We design a compact terahertz(THz) polarization beam splitter. Both plane wave expansion method and finite-difference time-domain method are used to calculate and analyze the characteristics of the proposed device. The designed polarization beam splitter can split TE-polarized and TM-polarized THz waves into different propagation directions. The simulation results show that the extinction ratios are larger than 18.36 dB for TE polarization and 13.35 dB for TM polarization in the frequency range from 1.86 THz to 1.91 THz, respectively. The designed polarization beam splitter has the advantages of small size and compact structure with a total size of 4.825 mm×0.400 mm. 展开更多
关键词 Finite difference time domain method Optical instruments Photonic crystals Prisms Time domain analysis
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Luminescence enhancement from Si-based materials by introducing a photonic crystal double-heterostructure slot waveguide microcavity 认领 引用
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作者 王玥 吴远大 +2 位作者 张家顺 安俊明 胡雄伟 《Optoelectronics Letters》 EI 2011年第4期266-268,共3页
We demonstrate a novel SOI-based photonic crystal（PC） double-heterostructure slot waveguide microcavity constructed by cascading three PC slot waveguides with different slot widths,and simulate the luminescence enha... We demonstrate a novel SOI-based photonic crystal（PC） double-heterostructure slot waveguide microcavity constructed by cascading three PC slot waveguides with different slot widths,and simulate the luminescence enhancement of sol-gel Er-doped SiO2 filled in the microcavity by finite-difference time-domain（FDTD） method.The calculated results indicate that a unique sharp resonant peak dominates in the spectrum at the expected telecommunication wavelength of 1.5509 mm,with very high normalized peak intensity of ~108.The electromagnetic field of the resonant mode exhibits the strongest in the microcavity,and decays rapidly to zero along both sides,which means that the resonant mode field is well confined in the microcavity.The simulation results fully verify the enhancement of luminescence by PC double-heterostructure slot waveguide microcavity theoretically,which is a promising way to realize the high-efficiency luminescence of Si-based materials. 展开更多
关键词 Electromagnetic fields Finite difference time domain method Luminescence Photonic crystals Silicon compounds Time domain analysis Waveguides
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Light propagation characteristics through the annular coupled-cavity waveguides based on the two-dimensional square-lattice photonic crystal 认领 引用
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作者 冯帅 李予喜 +1 位作者 敖玲 任承 《Optoelectronics Letters》 EI 2011年第2期129-132,共4页
The light propagation characteristics through the annular coupled-resonator cavity waveguides are systematically analyzed by the finite-difference time-domain (FDTD) method. It is found that this kind of waveguide has... The light propagation characteristics through the annular coupled-resonator cavity waveguides are systematically analyzed by the finite-difference time-domain (FDTD) method. It is found that this kind of waveguide has more minbands owing to the increasing of the cavity’s size, compared with the traditional line-typed coupled-resonator waveguide. The group velocity of light propagation can be reduced for a further degree when the adjacent annular cavities are interlaced in the perpendicular direction, and a group velocity about 0.00067c (c is the light speed in vacuum) can be obtained. 展开更多
关键词 Finite difference time domain method Light propagation Light velocity Photonic crystals Resonators Waveguides
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Fabricating scheme and optical properties of a flexible semiconductor micro-laser 认领 引用
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作者 王慧琴 欧阳红 +1 位作者 韩道福 王一凡 《Optoelectronics Letters》 EI 2011年第3期178-181,共4页
A new scheme for fabricating a kind of flexible semiconductor micro-laser is put forward.And the optical properties of this kind of flexible semiconductor laser are investigated by the finite difference time domain(FD... A new scheme for fabricating a kind of flexible semiconductor micro-laser is put forward.And the optical properties of this kind of flexible semiconductor laser are investigated by the finite difference time domain(FDTD) method.The results show that the light should be localized by photonic crystals(PCs),and the interaction between light and gain medium should be enhanced,while the mode of laser should be modulated.These results indicate that the PCs could control the spontaneous emission,and lead the radiation emission to the needed frequency. 展开更多
关键词 Finite difference time domain method Lasers Optical properties Photonic crystals Time domain analysis
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Modeling infrared radiative properties of nanoscale metallic complex slit arrays 认领 引用
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作者 王爱华 牛义红 陈玉彬 《Journal of Central South University》 SCIE EI CAS 2014年第10期3927-3935,共9页
The radiative properties(absorptance, reflectance, and transmittance) of deep slits with five nanoscale slit profile variations at the transverse magnetic wave incidence were numerically investigated by employing the ... The radiative properties(absorptance, reflectance, and transmittance) of deep slits with five nanoscale slit profile variations at the transverse magnetic wave incidence were numerically investigated by employing the finite difference time domain method. For slits with attached features, their radiative properties can be much different due to the modified cavity geometry and dangled structures, even at wavelengths between 3 and 15 μm. The shifts of cavity resonance excitation result in higher transmittance through narrower slits at specific wavelengths and resonance modes are confirmed with the electromagnetic fields. Opposite roles possibly played by features in increasing or decreasing absorptance are determined by the feature position and demonstrated by Poynting vectors. Correlations among all properties of a representative slit array and the slit density are also comprehensively studied. When multiple slit types coexist in an array(complex slits), a wide-band transmittance or absorptance enhancement is feasible by merging spectral peaks contributed from each type of slits distinctively. Discrepancy among infrared properties of four selected slit combinations is explained while effects of slit density are also discussed. 展开更多
关键词 finite difference time domain method subwavelength structures radiative properties complex slit arrays cavity resonance
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