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Band Engineering and Structural-Geometrical Engineering in 2D/3D van der Waals Heterostructures for Advanced Photodetection and Intelligent Sensing 认领 引用
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作者 Miaomiao Yang Kaiwen Gong +3 位作者 Yanxia Cui Shaoding Liu Guohui Li Shenghuang Lin 《Nano-Micro Letters》 SCIE EI CAS CSCD 2026年第9期25-76,共52页
With the rapid advancement of the information era,the demand for device integration and intelligent sensing has grown significantly.Traditional three-dimensional(3D)materials are constrained by lattice mismatch and in... With the rapid advancement of the information era,the demand for device integration and intelligent sensing has grown significantly.Traditional three-dimensional(3D)materials are constrained by lattice mismatch and interfacial defects,and their limited functionalities often require bulky auxiliary components.In contrast,the rich family of two-dimensional(2D)materials eliminates lattice-matching constraints and offers unique light-matter interactions,paving the way for compact and novel intelligent sensing technologies.However,large-area fabrication and precise layer alignment in all-2D systems remain major challenges that hinder device scalability.Given that the performance and manufacturing capabilities of 2D materials cannot replace traditional semiconductors(such as Si),they are more likely to be heterogeneously integrated with conventional 3D semiconductors.2D/3D heterojunctions combine the distinctive optoelectronic properties of 2D materials with the mature electronic functionalities of 3D semiconductors.In this work,we present recent advances in 2D/3D heterojunction photodetectors,with a particular emphasis on the underlying physical mechanisms,including band structure design,interface optimization,external-field coupling,and novel topological configurations.Meanwhile,we also explore emerging opportunities for CMOS-compatible and intelligent sensing optoelectronic systems.Finally,the challenges and future research directions toward the integrated development of 2D/3D heterojunctions are discussed. 展开更多
关键词 2D/3D heterostructures Mixed-dimensional integration Photodetectors Optoelectronic applications
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Ultrafast multi-target control of tightly focused light fields 认领 引用 被引量：7
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作者 Yanxiang Zhang Xiaofei Liu +5 位作者 Han Lin Dan Wang Ensi Cao Shaoding Liu Zhongquan Nie Baohua Jia 《Opto-Electronic Advances》 SCIE EI CAS 2022年第3期76-87,共12页
The control of ultrafast optical field is of great interest in developing ultrafast optics as well as the investigation on vari-ous light-matter interactions with ultrashort pulses.However,conventional spatial encodin... The control of ultrafast optical field is of great interest in developing ultrafast optics as well as the investigation on vari-ous light-matter interactions with ultrashort pulses.However,conventional spatial encoding approaches have only lim-ited steerable targets usually neglecting the temporal effect,thus hindering their broad applications.Here we present a new concept for realizing ultrafast modulation of multi-target focal fields based on the facile combination of time-depend-ent vectorial diffraction theory with fast Fourier transform.This is achieved by focusing femtosecond pulsed light carrying vectorial-vortex by a single objective lens under tight focusing condition.It is uncovered that the ultrafast temporal de-gree of freedom within a configurable temporal duration(~400 fs)plays a pivotal role in determining the rich and exotic features of the focused optical field at one time,namely,bright-dark alternation,periodic rotation,and longitudinalrans-verse polarization conversion.The underlying control mechanisms have been unveiled.Besides being of academic in-terest in diverse ultrafast spectral regimes,these peculiar behaviors of the space-time evolutionary beams may underpin prolific ultrafast-related applications such as multifunctional integrated optical chip,high-efficiency laser trapping,micro-structure rotation,super-resolution optical microscopy,precise optical measurement,and liveness tracking. 展开更多
关键词 ultrafast optical field vectorial diffraction theory fast Fourier transform vectorial vortex beam space-time shaping
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Phase-purity engineering in quasi-2D perovskites for amplified spontaneous emission 认领 引用
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作者 Wenhui Zhao Zhibin Cheng +6 位作者 Aohua Niu Yujing Wang Rong Wen Shaoding Liu Kaibo Zheng Guohui Li Yanxia Cui 《Science China Materials》 SCIE EI CAS CSCD 2026年第7期3847-3855,共9页
Solution-processable quasi-2D perovskites are regarded as promising candidates for laser gain media due to their superior exciton binding energy and stability compared to their 3D counterparts.However,quasi-2D perovsk... Solution-processable quasi-2D perovskites are regarded as promising candidates for laser gain media due to their superior exciton binding energy and stability compared to their 3D counterparts.However,quasi-2D perovskites produced through conventional methods often display a distribution of n-value phases,arising from the necessity of multiple precursors to react.The presence of impurity phases may introduce interfacial defects and energetic disorder,which can hinder charge injection into the desired emission centers.In this study,we present the first demonstration of stimulated emission from a phase-pure quasi-2D perovskite achieved through a solvent-sieving method for selective phase removal.This approach enables the dynamic purification of quasi-2D perovskites(n=8)and significantly lowers the threshold for amplified spontaneous emission.X-ray diffraction and ultraviolet-visible characterization reveal a near-unity n=8 phase(99.85%)with no detectable low-n phases in our samples.Additionally,the phase-pure quasi-2D perovskite film exhibits a narrower and more intense 001 peak(full width at half maximum(FWHM)of 0.16 nm,intensity of 16,129)compared to that of the pristine quasi-2D perovskite film(FWHM of 0.22 nm,intensity of 3304),indicating an increased grain size and enhanced crystallinity.This improvement leads to a prolonged charge carrier lifetime of approximately 6.98 ns,suggesting a reduced trap density.Furthermore,the phase-pure perovskite film is nearly pinhole-free and features an exceptionally flat surface with a root mean square roughness of 1.18 nm.Consequently,the phase-pure quasi-2D perovskite demonstrates a lower amplified spontaneous emission threshold of approximately 13.82μJ cm-2,representing a 12.5%reduction compared to conventional mixed-phase films.This work offers an efficient method for producing pure-phase quasi-2D perovskite suitable for low-threshold lasers. 展开更多
关键词 pure-phase quasi-2D perovskites low-threshold lasers solvent sieve method
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Indefinite metacavities coupled to a mirror:bound states in the continuum with anomalous resonance scaling 认领 引用
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作者 QIANG ZHANG PEIXIANG LI +2 位作者 ZHIYUAN GU SHAODING LIU ZEJUN DUAN 《Photonics Research》 SCIE EI CAS CSCD 2024年第3期598-607,共10页
Indefinite metacavities(IMCs)made of hyperbolic metamaterials show great advantages in terms of extremely small mode volume due to large wave vectors endowed by the unique hyperbolic dispersion.However,quality(Q)facto... Indefinite metacavities(IMCs)made of hyperbolic metamaterials show great advantages in terms of extremely small mode volume due to large wave vectors endowed by the unique hyperbolic dispersion.However,quality(Q)factors of IMCs are limited by Ohmic loss of metals and radiative loss of leaked waves.Despite the fact that Ohmic loss of metals is inevitable in IMCs,the radiative loss can be further suppressed by leakage engineering.Here we propose a mirror coupled IMC structure which is able to operate at Fabry–Pérot bound states in the continuum(BICs)while the hyperbolic nature of IMCs is retained.At the BIC point,the radiative loss of magnetic dipolar cavity modes in IMCs is completely absent,resulting in a considerably increased Q factor(>90).Deviating from the BIC point,perfect absorption bands(>0.99)along with a strong near-field intensity enhancement(>1.8×104)appear when the condition of critical coupling is almost fulfilled.The proposed BICs are robust to the geometry and material composition of IMCs and anomalous scaling law of resonance is verified during the tuning of optical responses.We also demonstrate that the Purcell effect of the structure can be significantly improved under BIC and quasi-BIC regimes due to the further enhanced Q factor to mode volume ratio.Our results provide a new train of thought to design ultra-small optical nanocavities that may find many applications benefitting from strong light–matter interactions. 展开更多
关键词 hyperbolic mirror definite
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