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Silica optical fiber integrated with two-dimensional materials:towards opto-electro-mechanical technology

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Light(Science & Applications) 2021年第5期10卷 767-784页

作者： Jin-hui Chen Yi-feng Xiong Fei Xu yan-qing lu Institute of Electromagnetics and Acoustics Xiamen UniversityXiamen 361005China College of Engineering and Applied Sciences National Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093China

In recent years,the integration of graphene and related two-dimensional(2D)materials in optical fbers have stimulated signifcant advances in ll-fber photonics and *** conventional passive silia fiber devices with 2D materials are empowered for enhancing light-matter interactions and are applied for manipulating light beams in respect of their polarization,phase,intensity and frequency,and even realizing the active photo-electric conversion and electro-optic modulation,which paves a new route to the integrated multifunctional ll-fber optoelectronic *** article reviews the fast-progress field of hybrid 2D-materials-optical fiber for the opto-electro-mechanical *** challenges and opportunities in this field for future development are discussed.

关键词： fiber optical polarization

Liquid crystal depolarizer based on photoalignment technology

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Photonics Research 2016年第2期4卷 70-73页

作者： Bing-yan Wei Peng Chen Shi-Jun Ge Li-Chao Zhang Wei Hu yan-qing lu National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced Microstructures and College of Engineering and Applied Sciences Nanjing University Thorlabs China

We propose a depolarizer based on the principle of a collection of half-wave plates with randomly distributed optic axes. The design is demonstrated by means of dynamically photopatterning liquid crystal into randomly aligned homogeneous domains. We characterize the liquid crystal depolarizer for 1550 nm and C-band(1520–1610 nm). A degree of polarization of less than 5% is obtained for any linearly polarized light. This study provides a practical candidate for high-performance depolarizers.

关键词： DOP Liquid crystal depolarizer based on photoalignment technology

Tunable and enhanced light emission in hybrid WS_(2)-optical-fiber-nanowire structures

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Light(Science & Applications) 2019年第1期8卷 1091-1098页

作者： Jin-hui Chen Jun Tan Guang-xing Wu Xue-jin Zhang Fei Xu yan-qing lu Key Laboratory of Intelligent Optical Sensing and Manipulation(Ministry of Education) College of Engineering and Applied SciencesNational Laboratory of Solid State Microstructures and Collaborative Innovation Center of Advanced MicrostructuresNanjing UniversityNanjing 210093People’s Republic of China School of Physics Nanjing UniversityNanjing 210093People’s Republic of China

In recent years,the two-dimensional(2D)transition metal dichalcogenides(TMDCs)have attracted renewed interest owing to their remarkable physical and chemical *** to that of graphene,the atomic thickness of TMDCs significantly limits their optoelectronic *** this study,we report a hybrid WS_(2)-optical-fibernanowire(WOFN)structure for broadband enhancement of the light-matter interactions,i.e.,light absorption,photoluminescence(PL)and second-harmonic generation(SHG),through evanescent field *** interactions between the anisotropic light field of an optical fiber nanowire(OFN)and the anisotropic second-order susceptibility tensor of WS_(2) are systematically studied theoretically and *** particular,an efficient SHG in the WOFN appears to be 20 times larger than that in the same OFN before the WS_(2) integration under the same ***,we show that strain can efficiently manipulate the PL and SHG in the WOFN owing to the large configurability of the silica *** results demonstrate the potential applications of waveguide-coupled TMDCs structures for tunable high-performance photonic devices.

关键词： fiber optical waveguide

Godunov-type solutions for gas-liquid two-phase transient flows with gas release effects

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Journal of Hydrodynamics 2023年第6期35卷 1179-1190页

作者： yan-qing lu Ling Zhou Tong-Chuan Che Zi-jian Xue Yun-jie Li Yin-ying Hu College of Water Conservancy and Hydropower Engineering Hohai UniversityNanjing210098China Department of Civil and Environmental Engineering The Hong Kong Polytechnic UniversityHong KongChina

The gas-liquid two-phase homogenous flow has been extensively investigated without the effect of gas ***,the dissolved gas will release when internal water pressure drops below saturation pressure during hydraulic *** results in inaccuracy or even invalidity of the existing model for homogenous flows,especially for the reproduction of two-phase mass transfer *** address this problem,this paper couples the gas release model with conservation equations of homogenous flows,which are numerically solved by the second-order Godunov-type scheme(GTS).Specifically,a virtual-cell method is adopted at system boundaries to achieve the same second-order accuracy as interior cells,which is realized by the monotonic upwind scheme for conservation laws(MUSCL-Hancock scheme).Simulated pressure curves by the proposed model are compared with a series of analytical,numerical and experimental *** indicates that the proposed model with gas release effects reproduces actual pressure responses most accurately,with minimum relative error and root mean squared error compared with experimental ***,the gas release leads to dynamic synchronous fluctuations of void fraction,wave speed and pressure head,including the opposite trends of void fraction and pressure,and higher void fraction leading to greater wave speed ***,sensitivity analysis is concluded with recommended Courant number,and different gas release effects in different initial void *** research increases the basic understanding of two-phase mass transfer processes and their implications for hydraulic transients.

关键词： Two-phase homogeneous flow transient flow gas release second-order Godunov-type scheme

Geometric phase-encoded stimuli-responsive cholesteric liquid crystals for visualizing real-time remote monitoring:humidity sensing as a proof of concept

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Light(Science & Applications) 2024年第2期13卷 283-293页

作者： Shi-Long Li Zhao-Yi Chen Peng Chen Wei Hu Chaohong Huang Sen-Sen Li Xuejia Hu yan-qing lu lu-Jian Chen Department of Electronic Engineering School of Electronic Science and EngineeringXiamen University361005 XiamenChina College of Engineering and Applied Sciences Nanjing University210093 NanjingChina Fujian Key Laboratory of Ultrafast Laser Technology and Applications Xiamen University361005 XiamenChina

Liquid crystals are a vital component of modern photonics,and recent studies have demonstrated the exceptional sensing properties of stimuli-responsive cholesteric liquid ***,existing cholesteric liquid crystal-based sensors often rely on the naked eye perceptibility of structural color or the measurement of wavelength changes by spectrometric tools,which limits their practical ***,developing a platform that produces recognizable sensing signals is *** this study,we present a visual sensing platform based on geometric phase encoding of stimuli-responsive cholesteric liquid crystal polymers that generates real-time visual patterns,rather than frequency *** demonstrate this platform’s effectiveness,we used a humidity-responsive cholesteric liquid crystal polymer film encoded with a q-plate pattern,which revealed that humidity causes a shape change in the vortex beam reflected from the encoded cholesteric liquid crystal ***,we developed a prototype platform towards remote humidity monitoring benefiting from the high directionality and long-range transmission properties of laser beams carrying orbital angular *** approach provides a novel sensing platform for cholesteric liquid crystals-based sensors that offers promising practical *** ability to generate recognizable sensing signals through visual patterns offers a new level of practicality in the sensing field with stimuli-responsive cholesteric liquid *** platform might have significant implications for a broad readership and will be of interest to researchers working in the field of photonics and sensing technology.

关键词： humidity visual liquid

Electrically tunable planar liquid-crystal singlets for simultaneous spectrometry and imaging

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Light(Science & Applications) 2024年第11期13卷 2589-2598页

作者： Zhou Zhou Yiheng Zhang Yingxin Xie Tian Huang Zile Li Peng Chen yan-qing lu Shaohua Yu Shuang Zhang Guoxing Zheng Electronic Information School and School of MicroelectronicsWuhan UniversityWuhan 430072China NUS Graduate School National University of SingaporeSingapore 119077Singapore Department of Electrical and Computer Engineering National University of SingaporeSingapore 117583Singapore National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and Manipulationand College of Engineering and Applied SciencesNanjing UniversityNanjing 210093China Peng Cheng Laboratory Shenzhen 518055China New Cornerstone Science Laboratory Department of PhysicsUniversity of Hong KongHong KongChina Department of Electrical and Electronic Engineering University of Hong KongHong KongChina Wuhan Institute of Quantum Technology Wuhan 430206China

Conventional hyperspectral cameras cascade lenses and spectrometers to acquire the spectral datacube,which forms the fundamental framework for hyperspectral ***,this cascading framework involves tradeoffs among spectral and imaging performances when the system is driven toward ***,we propose a spectral singlet lens that unifies optical imaging and computational spectrometry functions,enabling the creation of minimalist,miniaturized and high-performance hyperspectral *** a paradigm,we capitalize on planar liquid crystal optics to implement the proposed framework,with each liquid-crystal unit cell acting as both phase modulator and electrically tunable spectral *** with various targets show that the resulting millimeter-scale hyperspectral camera exhibits both high spectral fidelity(>95%)and high spatial resolutions(~1.7 times the diffraction limit).The proposed“two-in-one”framework can resolve the conflicts between spectral and imaging resolutions,which paves a practical pathway for advancing hyperspectral imaging systems toward miniaturization and portable applications.

关键词： crystal planar singlet

An all-optical modulator based on a stereo graphene–microfiber structure

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Light(Science & Applications) 2015年第1期4卷 42-46页

作者： Jin-Hui Chen Bi-Cai Zheng Guang-Hao Shao Shi-Jun Ge Fei Xu yan-qing lu National Laboratory of Solid State Microstructures Collaborative Innovation Center of Advanced MicrostructuresCollege of Engineering and Applied SciencesNanjing UniversityNanjing 210093China

An in-line,all-optical fiber modulator based on a stereo graphene–microfiber structure(GMF)utilizing the lab-on-rod technique was demonstrated in this *** to its unique spring-like geometry,an ultra-long GMF interaction can be achieved,and a modulation depth of,7.5 dB(,2.5 dB)and a modulation efficiency of,0.2 dB mW^(-1)(,0.07 dB mW^(-1))were demonstrated for two polarization *** modulation depth and modulation efficiency are more than one order of magnitude larger than those of other graphene–microfiber hybrid all-optical modulators,although at the cost of a higher insertion *** further optimizing the transferring and cleaning process,the upper limit of the modulation depth is mainly determined by the loss from the intrinsic absorption,which depends on the light–graphene ***,the modulator can quickly switch between the on-state and the off-state with a theoretically maximized modulation depth of tens of *** modulator is compatible with the current fiber-optic communication systems and may be applied in the near future to meet the impending need for ultrafast optical signal processing.

关键词： graphene microfiber optical modulation polarization

Pancharatnam-Berry phase reversal via opposite-chirality-coexisted superstructures

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Light(Science & Applications) 2022年第6期11卷 1186-1193页

作者： Lin Zhu Chun-Ting Xu Peng Chen Yi-Heng Zhang Si-Jia Liu Quan-ming Chen Shi-Jun Ge Wei Hu yan-qing lu National Laboratory of Solid State Microstructures Key Laboratory of Intelligent Optical Sensing and ManipulationCollege of Engineering and Applied Sciencesand Collaborative Innovation Center of Advanced MicrostructuresNanjing University210093 NanjingChina

Recently discovered reflective Pancharatnam-Berry phase(PB phase)from chiral anisotropic media(e.g.,cholesteric liquid crystal,CLC)has aroused great interest in the emerging frontier of planar ***,the single chirality of common CLCs results in the intrinsic limitation of the same spin-selective PB phase manipulation,which means the reversal of the input spin cannot realize the conjugated PB *** this work,an innovative scheme based on opposite-chirality-coexisted superstructures is proposed to simultaneously modulate orthogonal circular polarization and get PB phase *** refilling CLC into a washed-out polymer network with opposite chirality and delicate photo-patterned structures,reflective optical vortex(OV)with opposite topological charges and vector beams with conjugated spiral PB phases are efficiently generated depending on the incident ***,OV holograms are encoded to reconstruct polarization-selective OV arrays,indicating the strong capability of such opposite-chirality-coexisted anisotropic *** work provides a new compact platform for planar optics,and sheds light on the architectures and functionalities of chiral superstructures.

关键词： opposite Berry optics

Tailoring electron vortex beams with customizable intensity patterns by electron diffraction holography

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Opto-Electronic Advances 2024年第2期7卷 14-21页

作者： Pengcheng Huo Ruixuan Yu Mingze Liu Hui Zhang yan-qing lu Ting Xu National Laboratory of Solid-State Microstructures and Collaborative Innovation Center of Advanced Microstructures Nanjing UniversityNanjing 210093China College of Engineering and Applied Sciences Key Laboratory of Intelligent Optical Sensing and Manipulation and Jiangsu Key Laboratory of Artificial Functional MaterialsNanjing UniversityNanjing 210093China

An electron vortex beam(EVB) carrying orbital angular momentum(OAM) plays a key role in a series of fundamental scientific researches, such as chiral energy-loss spectroscopy and magnetic dichroism spectroscopy. So far, almost all the experimentally created EVBs manifest isotropic doughnut intensity patterns. Here, based on the correlation between local divergence angle of electron beam and phase gradient along azimuthal direction, we show that free electrons can be tailored to EVBs with customizable intensity patterns independent of the carried OAM. As proof-of-concept, by using computer generated hologram and designing phase masks to shape the incident free electrons in the transmission electron microscope, three structured EVBs carrying identical OAM are tailored to exhibit completely different intensity patterns. Furthermore, through the modal decomposition, we quantitatively investigate their OAM spectral distributions and reveal that structured EVBs present a superposition of a series of different eigenstates induced by the locally varied geometries. These results not only generalize the concept of EVB, but also demonstrate an extra highly controllable degree of freedom for electron beam manipulation in addition to OAM.

关键词： electron vortex beam orbital angular momentum diffraction holography