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Plasmon-phonon coupling in graphene-hyperbolic bilayer heterostructures

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Chinese Physics B 2016年第11期25卷 324-332页

作者：尹格元军姜玮朱剑飞马云贵 state key laboratory of modern optical instrumentation Center for Optical and Electromagnetic ResearchCollege of Optical Science and Engineering Zhejiang University

Polar dielectrics are important optical materials enabling the subwavelength manipulation of light in infrared due to their capability to excite phonon *** practice,it is highly desired to actively modify these hyperbolic phonon polaritons（HPPs） to optimize or tune the response of the *** this work,we investigate the plasmonic material,a monolayer graphene,and study its hybrid structure with three kinds of hyperbolic thin films grown on SiO_2 *** inter-mode hybridization and their tunability have been thoroughly clarified from both the band dispersions and the mode patterns numerically calculated through a transfer matrix *** results show that these hybrid multilayer structures are of strong potentials for applications in plasmonic waveguides,modulators and detectors in infrared.

关键词： hyperbolic phonon desired clarified multilayer Polar enabling manipulation infinite optimize

Applications of nanostructures in wide-field, label-free super resolution microscopy

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Chinese Physics B 2018年第11期27卷 186-195页

作者： Xiaowei Liu Chao Meng Xuechu Xu Mingwei Tang,Chenlei Pang Qing Yang state key laboratory of modern optical instrumentation College of Optical Science and Engineering Zhejiang University. Hangzhou 310027 China

Super resolution imaging capable of resolving details beyond the diffraction limit is highly desired in many scientific and application fields, including bio-medicine, nanomaterial science, and opto-electronic integration. Up to now, many different methods have been proposed, among which wide-field, label-free super resolution microscopy is indispensable due to its good applicability to diverse sample types, large field of view（FOV）, and high imaging speed. In recent years,nanostructures have made a crucial contribution to the wide-field, label-free subdiffraction microscopy, with various working mechanisms and configuration designs. This review summarizes the recent applications of the nanostructures in the wide-field, label-free super resolution microscopy, with the emphasis on the designs of hyperlens with hyperbolic dispersion, microsphere with ＂nano-jets＂, and nanowire ring illumination microscopy based on spatial frequency shift effect. The bottlenecks of the current techniques and possible solutions are also discussed.

关键词： optical microscopy spatial resolution nanowire metamaterials

Silicon nanophotonics for on-chip light manipulation

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Chinese Physics B 2018年第10期27卷 46-57页

作者： Jingshu Guo Daoxin Dai Center for optical and Electromagnetic Research State Key Laboratory for Modern Optical InstrumentationCollege of Optical Science and EngineeringZhejiang UniversityHangzhou 310058China

The field of silicon nanophotonics has attracted considerable attention in the past decade because of its unique advantages,including complementary metal–oxide–semiconductor（CMOS） compatibility and the ability to achieve an ultra-high integration density. In particular, silicon nanophotonic integrated devices for on-chip light manipulation have been developed successfully and have played very import roles in various applications. In this paper, we review the recent progress of silicon nanophotonic devices for on-chip light manipulation, including the static type and the dynamic type. Static onchip light manipulation focuses on polarization/mode manipulation, as well as light nanofocusing, while dynamic on-chip light manipulation focuses on optical modulation/switching. The challenges and prospects of high-performance silicon nanophotonic integrated devices for on-chip light manipulation are discussed.

关键词： silicon nanophotonics polarization mode manipulation nanoplasmonics optical modulator optical switch.

Thermal camouflage based on the phasechanging material GST

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Light(science & Applications) 2018年第1期7卷 834-843页

作者： Yurui Qu Qiang Li Lu Cai Meiyan Pan Pintu Ghosh Kaikai Du Min Qiu state key laboratory of modern optical instrumentation College of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China

Camouflage technology has attracted growing interest for many thermal *** experimental demonstrations of thermal camouflage technology have not adequately explored the ability to continuously camouflage objects either at varying background temperatures or for wide observation *** this study,a thermal camouflage device incorporating the phase-changing material Ge2Sb2Te5(GST)is experimentally *** has been shown that near-perfect thermal camouflage can be continuously achieved for background temperatures ranging from 30℃ to 50℃ by tuning the emissivity of the device,which is attained by controlling the GST phase *** thermal camouflage is robust when the observation angle is changed from 0°to 60°.This demonstration paves the way toward dynamic thermal emission control both within the scientific field and for practical applications in thermal information.

关键词： continuously phase perfect

Advances in halide perovskite semiconductors for energy-integrated and energy-resolved X-ray detection

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Journal of Zhejiang University-science A(Applied Physics & engineering) 2024年第10期25卷 824-840页

作者： Yibin LAI Yang(Michael)YANG state key laboratory of modern optical instrumentation Institute for Advanced PhotonicsCollege of Optical Science and EngineeringZhejiang UniversityHangzhou 310027China

X-ray andγ-ray detectors are widely used in medical,military,security,material analysis,and industrial *** recent years,perovskite materials have become promising materials for radiation detection owing to their strong stopping power,considerable carrier transportation ability,and simple synthesis *** studies have demonstrated both direct and indirect radiation detectors using perovskite *** this review,we aim to elucidate the mechanism by which X-rays andγ-rays interact with matter,explain the principles of the energy integrating mode and photon counting mode for direct detection,and discuss the key factors determining device ***,we summarize recent advances in perovskite-based radiation detectors for both ***,we identify challenges that need to be overcome to enable perovskite materials to be successfully commercialized.

关键词： Halide perovskite X-ray Direct detection Photo counting

A digital moiré fringe method for displacement sensors

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Frontiers of Information Technology & Electronic engineering 2016年第9期17卷 946-953页

作者： Jian WU Ting-ting ZHOU Bo YUAN Li-qiang WANG state key laboratory of modern optical instrumentation CNERC for Optical Instrument Zhejiang University

In this study, a displacement measurement method based on digital moiré fringe is described and experimentally demonstrated. The method is formed by only one grating with a constant pitch. First, the magnified grating image is received by an imaging array and is sent to a computer. Then, the digital moiré fringes are generated by overlaying the grating image with its mirrored one. Finally, a specifically designed algorithm is used to obtain the fringes' phase difference before and after movement and calculate the displacement. This method has the effects of amplifying displacement and averaging the grating lines error, the same as the traditional moiré technique using two pieces of gratings. At the same time, the proposed system is much easier to assemble and the measurement resolution can be set more flexibly. One displacement measuring system based on this method was built up. Experiment results show that its measurement errors are less than 0.3 μm and less than 0.12 μm at the resolutions of 0.1 μm and 0.03 μm, respectively.

关键词： Digital moiré fringe Displacement measurement Grating

Pupil design based on Fisher information optimization to extend field depth in practical optical system

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Chinese Optics Letters 2010年第2期8卷 159-161页

作者：刘钦晓赵廷玉陈燕平张文字余飞鸿 state key laboratory of modern optical instrumentation Optical Engineering DepartmentZhejiang University Physics Department College of ScienceNingbo University of Technology

Wavefront coding （WFC） is used to extend the field depth of an incoherent optical system by employing a phase mask on the pupil. We uses a Fisher information （FI） metric based optimization method to design a phase mask by taking the modulation transfer function （MTF） of the practical optical system into consid- eration. This method can modulate the wavefront so that the point spread function and optical transfer function are insensitive to the object distance. The simulation results show that the optimized phase mask based on the proposed method can further improve the defocusing image quality while maintaining the focusing image quality.

关键词： Fisher information matrix Image quality optical design optical systems optical transfer function Optimization Wavefronts

Simple PSF based method for pupil phase mask’s optimization in wavefront coding system

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Journal of Zhejiang University-science A(Applied Physics & engineering) 2007年第2期8卷 180-185页

作者： ZHANG Wen-zi CHEN Yan-ping ZHAO Ting-yu YE Zi YU Fei-hong state key laboratory of modern optical instrumentation Optical Engineering Department Zhejiang University Hangzhou 310027 China

By applying the wavefront coding technique to an optical system, the depth of focus can be greatly increased. Several complicated methods, such as Fisher Information based method, have already been taken to optimize for the best pupil phase mask in ideal condition. Here one simple point spread function (PSF) based method with only the standard deviation method used to evaluate the PSF stability over the depth of focus is taken to optimize for the best coefficients of pupil phase mask in practical optical systems. Results of imaging simulations for optical systems with and without pupil phase mask are presented, and the sharpness of image is calculated for comparison. The optimized results showed better and much more stable imaging quality over the original system without changing the position of the image plane.

关键词： Wavefront coding Pupil phase mask Depth of focus PSF stability Optimization Sharpness Imaging simulation

Near-Field Characterization of optical Micro/Nanofibres

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Chinese Physics Letters 2007年第10期24卷 3006-3008页

作者：马哲王姗姗杨青童利民 state key laboratory of modern optical instrumentation Department of Optical Engineering Zhejiang University Hangzhou 310027

Near-field scanning optical microscopy is used to investigate the waveguiding properties of optical micro/nanofibres （MNFs） by means of detecting optical power carried by evanescent waves. Taper drawn silica and tellurite MNFs, supported on low-index substrates, are used to guide a 532-nm-wavelength light beam for the test. Modification of the single-mode condition of the MNF in the presence of a substrate is observed. Spatial modulation of the longitudinal field intensity （with a 195-nm period） near the output end of a 760-nm-diameter silica MNF is well resolved. Energy exchange through evanescent coupling between two parallel MNFs is also investigated.

关键词： SUBWAVELENGTH PHOTONICS INTEGRATION CHANNEL WAVE-GUIDES SILICA NANOWIRES DIAMETER SILICA MICROSCOPY