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Chinese Physics B 2016年第6期25卷 259-263页

作者：王河林吴彬王肖隆 center for Optics and optoelectronics research Zhejiang University of Technology

Based on the designed As2Se3 and As2S3 chalcogenide glass photonic crystal fiber（PCF） and the scalar nonlinear Schrdinger equation,the effects of pump power and wavelength on modulation instability（MI） gain are comprehensively studied in the abnormal dispersion regime of chalcogenide glass PCF.Owing to high Raman effect and high nonlinearity,ultra-broadband MI gain is obtained in chalcogenide glass PCF.By choosing the appropriate pump parameter,the MI gain bandwidth reaches 2738 nm for the As2Se3 glass PCF in the abnormal-dispersion region,while it is 1961 nm for the As2S3 glass PCF.

关键词： ultra-broadband modulation instability Raman effect high nonlinearity chalcogenide glass photonic crystal fiber

Pressure dependent modulation instability in photonic crystal fiber filled with argon gas

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Chinese Physics B 2018年第9期27卷 338-341页

作者：王河林杨爱军王肖隆吴彬阮乂 center for Optics & optoelectronics research Zhejiang University of Technology College of Science Zhejiang University of Technology

By using the designed photonic crystal fiber filled with argon gas, the effect of gas pressure on modulation instability（MI） gain is analyzed in detail. The MI gain bandwidth increases gradually as the argon gas pressure rises from 1 P0 to 400 P0（P0 is one standard atmosphere）, while its gain amplitude slightly decreases. Moreover, the increase of the incident light power also results in the increase of MI gain bandwidth in the Stokes or anti-Stokes region when the incident power increases from 1 W to 200 W. Making use of the optimal parameters including the higher argon gas pressure（400 P0） and the incident light power（200 W）, we finally obtain a 100 nm broadband MI gain. These results indicate that controlling the MI gain characteristic by changing the argon gas pressure in PCF is an effective way when the incident light source is not easy to satisfy the requirement of practical application. This method of controlling MI gain can be used in optical communication and laser shaping.

关键词： modulation instability gas pressure light power.broadband gain

Global modes and coupled modes for integrated twin circular-side octagon microlasers

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Science China(Information Sciences) 2022年第2期65卷 173-180页

作者： Ke YANG Yuede YANG Youzeng HAO Jiliang WU Yongtao HUANG Jiachen LIU Jinlong XIAO Yongzhen HUANG State Key Laboratory of Integrated optoelectronics Institute of Semiconductors Chinese Academy of Sciences center of Materials Science and optoelectronics Engineering University of Chinese Academy of Sciences

Whispering-gallery mode(WGM) microlasers are potential light sources for photonic integrated circuits and optical information processing. In this paper, an integrated twin circular-side octagon microlaser(TCOM) composed of two identical circular-side octagon microcavities(COMs) is proposed and demonstrated for realizing lasing mode control. In a TCOM, we found a global mode with the mode field of an "8" pattern(labeled "8" mode) in addition to weak coupling modes of traditional four-bounce modes. The "8" mode belongs to the whole coupled cavity and is insensitive to the refractive index offset of coupled COMs, but the weak coupling modes are strongly sensitive to the refractive index offset. Lasing mode transformation from multiple coupled modes to a single "8" mode is demonstrated by adjusting the refractive index offset through injection currents. Weak coupling modes for directly connected TCOMs and lasing mode control make the COM a potential unit for large-scale photonic integration and optical information processing.

关键词： optical microcavity semiconductor lasers coupled cavity lasing mode control photonic integration

Tunable filters based on an SOI nano-wire waveguide micro ring resonator

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Journal of Semiconductors 2011年第8期32卷 65-69页

作者：李帅吴远大尹小杰安俊明李建光王红杰胡雄伟 optoelectronics research and Development center Institute of SemiconductorsChinese Academy of Sciences

Micro ring resonator（MRR） filters based on a silicon on insulator（SOI） nanowire waveguide are fabricated by electron beam photolithography（EBL） and inductive coupled plasma（ICP） etching technology.The cross-section size of the strip waveguides is 450×220 nm2,and the bending radius of the micro ring is around 5μm.The test results from the tunable filter based on a single ring show that the free spectral range（FSR） is 16.8 nm and the extinction ratio（ER） around the wavelength 1550 nm is 18.1 dB.After thermal tuning,the filter＇s tuning bandwidth reaches 4.8 nm with a tuning efficiency of 0.12 nm/℃Meanwhile,we fabricated and studied multi-channel filters based on a single ring and a double ring.After measurement,we drew the following conclusions： during the signal transmission of multi-channel filters,crosstalk exists mainly among different transmission channels and are fairly distinct when there are signals input to add ports.

关键词： SOI micro ring resonator thermo-optic effect filters crosstalk

Silica-based microcavity fabricated by wet etching

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Chinese Physics B 2017年第5期26卷 195-198页

作者：龙浩杨文应磊莹张保平 Department of Electronic Engineering Optoelectronics Engineering Research Center Xiamen University Xiamen 361005 China

Silica whispering gallery mode（WGM） microcavities were fabricated by the buffered oxide etcher and potassium hydroxide wet etching technique without any subsequent chemical or laser treatments. The silicon pedestal underneath was an octagonal pyramid, thus providing a pointed connection area with the top silica microdisk while weakly influencing the resonance modes. The sidewalls of our microdisks were wedge shaped, which was believed to be an advantage for the mode confinement. Efficient coupling from and to the 60 μm diameter microdisk structure was achieved using tapered optical fibres, exhibiting a quality factor of 1.5×10^4 near a wavelength of 1550 nm. Many resonance modes were observed, and double transverse electric modes were identified by theoretical calculations. The quality factor of the microdisks was also analysed to deduce the cavity roughness. The wet etching technique provides a more convenient avenue to fabricate WGM microdisks than conventional fabrication methods.

关键词： etching gallery fibres silica pyramid roughness subsequent confinement hydroxide shaped

Nonlinear optical trapping effect with reverse saturable absorption

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Advanced Photonics 2023年第4期5卷 66-73页

作者： Zheng Zhu Yuquan Zhang Shuoshuo Zhang Aurele J.L.Adam Changjun Min Hendrik Paul Urbach Xiaocong Yuan Shenzhen University Institute of Microscale Optoelectronics and State Key Laboratory of Radio Frequency Heterogeneous IntegrationNanophotonics Research CenterShenzhenChina research Institute of Intelligent Sensing Research Center for Humanoid SensingZhejiang LabHangzhouChina Delft University of Technology Optics Research GroupDelftThe Netherlands

Nonlinear responses of nanoparticles induce enlightening phenomena in optical tweezers. With thegradual increase in optical intensity, effects from saturable absorption (SA) and reverse SA (RSA) arise insequence and thereby modulate the nonlinear properties of materials. In current nonlinear optical traps,however, the underlying physical mechanism is mainly confined within the SA regime because thresholdvalues required to excite the RSA regime are extremely high. Herein, we demonstrate, both in theory andexperiment, nonlinear optical tweezing within the RSA regime, proving that a fascinating composite trappingstate is achievable at ultrahigh intensities through an optical force reversal induced through nonlinearabsorption. Integrated results help in perfecting the nonlinear optical trapping system, thereby providingbeneficial guidance for wider applications of nonlinear optics.

关键词： nonlinear optical tweezers optical force reverse saturable absorption

Dynamic polarization rotation and vector field steering based on phase change metasurface

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Frontiers of physics 2023年第1期18卷 193-199页

作者： Hairong He Hui Yang Zhenwei Xie Xiaocong Yuan Nanophotonics research center Shenzhen Key Laboratory of Micro-scale Optical Information TechnologyInstitute of Microscale OptoelectronicsShenzhen UniversityShenzhen 518060China

Polarization rotation and vector field steering of electromagnetic wave are of great significance in modern optical applications.However,conventional polarization devices are bulky,monofunctional and lack of tunability,which pose great challenges to the miniaturized and multifunctional applications.Herein,we propose a meta-device that is capable of multi-state polarization rotation and vector field steering based on phase change metasurface.The supercell of the meta-device consists of four Ge2Sb2Te5(GST)elliptic cylinders located on a SiO2 substrate.By independently controlling the phase state(amorphous or crystalline)of each GST elliptic cylinder,the meta-device can rotate the polarization plane of the linearly polarized incident light to different angles that cover from 19.8°to 154.9°at a wavelength of 1550 nm.Furthermore,by merely altering the phase transition state of GST elliptic cylinders,we successfully demonstrated a vector field steering by generating optical vortices carrying orbital angular momentums(OAMs)with topological charges of 0,1 and–1,respectively.The proposed method provides a new platform for investigating dynamically tunable optical devices and has potential applications in many fields such as optical communications and information processing.

关键词： polarization rotation vector field steering phase change metasurface

Memcomputing: fusion of memory and computing

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Science China(Information Sciences) 2018年第6期61卷 159-161页

作者： Yi LI Yaxiong ZHOU Zhuorui WANG Xiangshui MIAO Wuhan National research center for optoelectronics School of Optical and Electronic InformationHuazhong University of Science and Technology

In this world of ubiquitous computing,the contemporary electronic digital computer has become an essential machine that is available anytime and everywhere.Computing systems come in various forms,including desktops,la... 详细信息

关键词： In fusion of memory and computing Memcomputing

Dual-band perfect absorber for a mid-infrared photodetector based on a dielectric metal metasurface

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Photonics research 2021年第1期9卷 27-33页

作者： ZHAO CHEN YUDONG WENG JUNKU LIU NAN GUO YAOLUN YU LIN XIAO Nanophotonics and Optoelectronics Research Center Qian Xuesen Laboratory of Space TechnologyChina Academy of Space TechnologyBeijing 100094China

Mid-infrared thermal detectors have very important applications in the aerospace and military fields.However,due to the low heat transfer efficiency and slow response time,their application has been greatly restricted.Here,we theoretically demonstrate a dual-band perfect absorber for a mid-infrared detector based on a dielectric metal metasurface,and the optical and thermal properties are analyzed in detail.Simulation results show that the two narrow absorption peaks,corresponding to the absorption value of 97.5%atλ?6.142μm withλFWHM≈40 nm and 99.7%atλ=7.795μm withλFWHM≈80 nm,respectively,are achieved,and their different dependences on the structural parameters have been studied.A thermal detector at room temperature with total response time within 1.3 ms for dual-band and 0.4 ms for single-band is realized when the incident light flux is 1.0 W∕cm2 for an average temperature increase ofΔT≈1.0 K.Our study offers a promising approach for designing a narrowband mid-infrared perfect absorber and a high-performance photodetector in nano-integrated photonics.

关键词： absorber perfect dielectric

Fabrication and properties of non-stoichiometric Tb_(2)(Hf_(1-x)Tb_(x))_(2)O_(7-x)magneto-optical ceramics

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Journal of Advanced Ceramics 2022年第5期11卷 784-793页

作者： Lixuan ZHANG Xiaoying LI Dianjun HU Ziyu LIU Tengfei XIE Lexiang WU Zhaoxiang YANG Jiang LI Transparent Ceramics research center Shanghai Institute of CeramicsChinese Academy of SciencesShanghai 201899China center of Materials Science and optoelectronics Engineering University of Chinese Academy of SciencesBejing 100049China

Non-stoichiometric Tb_(2)(Hf_(1-x)Tb_(x))_(2)O_(7-x)(x=-0.07-0.45)magneto-optical ceramics were fabricated by solid-state reactive sintering in vacuum combined with hot isostatic pressing(HIP)posttreatment without any sintering aids.The phase composition,densification process,microstructure,optical transmittance,and Verdet constant of Tb_(2)(Hf_(1-x)Tb_(x))_(2)O_(7-x)ceramics were investigated.The in-line transmittance of(Tb_(0.93)Hf_(0.04))_(2)Hf_(2)O_(7.07)ceramics with a thickness of 2.0 mm reaches 74.6%at 1064 nm.The Verdet constant of Tb_(2)(Hf_(1-x)Tb_(x))_(2)O_(7-x)ceramics is-153.4,-155.8,and-181.2 rad/(T-m)at the wavelength of 633 nm when x=-0.07,0,and 0.1,respectively.The Verdet constant increases with the increase of Tb content,and these values are higher than that of the commercial Tb_(3)Ga_(5)O_(12) crystal,indicating that non-stoichiometric Tb_(2)(Hf_(1-x)Tb_(x))_(2)O_(7-x)ceramics have a great potential for the application in Faraday isolators.

关键词： magneto-optical ceramics Tb_(2)(Hf_(1-x)Tb_(x))_(2)O_(7-x)ceramics reactive sintering Verdet constant