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arXiv 2023年

作者： Rao, Jinwei Wang, C.Y. Yao, Bimu Chen, Z.J. Zhao, K.X. Lu, Wei School of Physical Science and Technology ShanghaiTech University Shanghai201210 China State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China

We experimentally realize a meter-scale strong coupling effect between magnons and photons at room temperature, with a coherent coupling of ∼ 20 m and a dissipative coupling of ∼ 7.6 m. To this end, we integrate a saturable gain into a microwave cavity and then couple this active cavity to a magnon mode via a long coaxial cable. The gain compensates for the cavity dissipation, but preserves the cavity radiation that mediates the indirect photon-magnon coupling. It thus enables the long-range strong photon-magnon coupling. With full access to traveling waves, we demonstrate a remote control of photon-magnon coupling by modulating the phase and amplitude of traveling waves, rather than reconfiguring subsystems themselves. Our method for realizing long-range strong coupling in cavity magnonics provides a general idea for other physical systems. Our experimental achievements may promote the construction of information networks based on cavity magnonics. © 2023, CC BY-NC-ND.

关键词： Photons

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ITO/Cu multilayer electrodes for high-brightness electrochromic displays

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escience 2022年第6期2卷 632-638页

作者： Xueqing Tang Zishou Hu Zhen Wang Jian Chen Xinyang Mu Ge Song Peiyan Sun Zhengji Wen Jiaming Hao Shan Cong Zhigang Zhao School of Nano-Tech and Nano-Bionics University of Science and Technology of Chin1Hefei 230000China Key Laboratory of Multifunctional Nanomaterials and Smart Systems Chinese Academy of Sciences(CAS)Suzhou 215123China Key Lab of Nanodevices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Division of Nanomaterials Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesNanchang 330200China State Key Laboratory of Infrared Physics Shanghai Institute of Technical PhysicsChinese Academy of SciencesShanghai 200083China

Fabry-Perot(F-P)nanocavity-type electrochromic devices with multicolor tunability have attracted significant interest in the past two years for their potential uses in a wide variety of applications,such as electronic display,military camouflage,and dynamic ***,challenges such as insufficient brightness,lengthy switching times,and poor cycling stability have yet to be ***,we demonstrate electrochromic electrodes based on ITO/Cu as both the current collector and the reflective layer,with WO_(3 )as the electrochromic material,forming a unique three-layered *** constituted WO_(3 )/ITO/Cu films present a high brightness value of about 84%before coloration,and a decent brightness value of 48%after coloration at−0.8***,a fast switching time between different coloration states(tc=2.2s;tb=1s)is recorded,attributed to the extremely low sheet resistivity of the ITO/Cu current *** films also reveal excellent electrochemical cycling stability across 2000 cycles.

关键词： Electrochromic High brightness Tungsten trioxide Copper

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Calibrating Photometric Redshift Measurements with the Multi-channel Imager(MCI) of the China Space Station Telescope(CSST)

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Research in Astronomy and Astrophysics 2022年第2期22卷 204-214页

作者： Ye Cao Yan Gong Zhen-Ya Zheng Chun Xu Key Laboratory of Space Astronomy and Technology National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China School of Astronomy and Space Sciences University of Chinese Academy of SciencesBeijing 100049China Science Center for China Space Station Telescope National Astronomical ObservatoriesChinese Academy of SciencesBeijing 100101China CAS Key Laboratory for Research in Galaxies and Cosmology Shanghai Astronomical ObservatoryShanghai 200030China Division of Optical Astronomical Technologies Shanghai Astronomical ObservatoryShanghai 200030China Joint Center of SHAO and SITP for Infrared Astronomical Instrumentation Shanghai Astronomical ObservatoryShanghai 200030China

The China Space Station Telescope(CSST) photometric survey aims to perform a high spatial resolution(~0.″ 15)photometric imaging for the targets that cover a large sky area(~17,500 deg^(2)) and wide wavelength range(from NUV to NIR). It expects to explore the properties of dark matter, dark energy, and other important cosmological and astronomical areas. In this work, we evaluate whether the filter design of the Multi-channel Imager(MCI), one of the five instruments of the CSST, can provide accurate photometric redshift(photoz) measurements with its nine medium-band filters to meet the relevant scientific objectives. We generate the mock data based on the COSMOS photometric redshift catalog with astrophysical and instrumental effects. The application of upper limit information of low signal-to-noise ratio data is adopted in the estimation of photoz. We investigate the dependency of photoz accuracy on the filter parameters, such as band position and width. We find that the current MCI filter design can achieve good photoz measurements with accuracy σ_(z)■ 0.017 and outlier fraction f_(c)■ 2.2%. It can effectively improve the photoz measurements of the main CSST survey using the Survey Camera to an accuracy σ_(z)■ 0.015 and outlier fraction f_(c)■ 1.5%. This indicates that the original MCI filters are proper for the photoz calibration.

关键词： cosmology:observations (cosmology:)large-scale structure of universe galaxies:distances and redshifts

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Obtaining Ultra-High Hardness in Spark Plasma Sintered Ge40As40Se20 Bulk Glass

SSRN

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SSRN 2024年

作者： Xie, Shuangquan Gu, Jierong Jia, Guang Liu, Zijun Gu, Chenjie Gao, Yixiao Zheng, Wenfeng Liu, Ziqiang Shen, Xiang Chen, Yimin Laboratory of Infrared Material and Devices Advanced Technology Research Institute Ningbo University Ningbo315211 China Ningbo Institute of Oceanography Ningbo315832 China Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Zhejiang Ningbo315211 China Department of Microelectronic Science and Engineering School of Physical Science and Technology Ningbo University Ningbo315211 China

We performed mechanical milling and Spark Plasma Sintering technology to fabricate a high Ge content chalcogenide glass, the Ge40As40Se20 glass, which locates outside the Ge-As-Se glass-forming domain. By using the optimal ball milling time of 50 h and sintering stress of 37.5 MPa, the large size Ge40As40Se20 bulk glasses were obtained, which possesses both large Vickers hardness of 369 Hv and relative high optical transmission of 43% (@5 and 9 μm). Moreover, it was found there are pores in the sintered glasses more or less, and the pore size and number significantly affect transmission, i.e., the optimal Ge40As40Se20 bulk glasses were demonstrated has the smallest and least pores. The combination of mechanical milling and low-temperature sintering methods has been confirmed to improve the glass formability and then obtain the high Ge content component with a potential high hardness glass to break through the limited mechanical property of chalcogenides. © 2024, The Authors. All rights reserved.

关键词： Milling (machining)

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Thermal stability of magnetron sputtering Ge-Ga-S films

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Chinese Physics B 2020年第8期29卷 485-488页

作者： Lei Niu Yimin Chen Xiang Shen Tiefeng Xu Laboratory of Infrared Materials and Devices&Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Research Institute of Advanced TechnologyNingbo UniversityNingbo 315211China Department of Microelectronic Science and Engineering School of Physical Science and TechnologyNingbo UniversityNingbo 315211China

Ge-Ga-S thin films were deposited by magnetron sputtering with mean coordination number(MCN)ranging from 2.46 to *** physical properties of the Ge-Ga-S films,including optical band gap,refractive index,and thickness,vary with the time of heat *** on the analysis of the topology model,it is concluded that the Ge-Ga-S thin films with components close to the stoichiometric ratio can form the most Ga-S bonds and Ga-S bonds,and the physical properties of the Ge27.3Ga6.3S66.3(MCN=2.62)film are the most *** is an important reference for thin film photonic devices.

关键词： chalcogenide thin films refractive index optical band gap thermal stability

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Exceeding Two Octave-Spanning Supercontinuum Generation in Integrated as2 S3 Waveguides Pumped by a 2 Μm Fiber Laser

SSRN

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SSRN 2024年

作者： Zhao, Peipei Yang, Lei Xia, Kai Yang, Peilong Wang, Rongping Xu, Peipeng Faculty of Electrical Engineering and Computer Science Ningbo University Ningbo315211 China Laboratory of Infrared Materials and Devices Advanced Technology Research Institute Ningbo University Zhejiang Ningbo315211 China Key Laboratory of Photoelectric Detection Materials and Devices of Zhejiang Province Ningbo315211 China State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Wuhan National Laboratory for Optoelectronics School of Physics Huazhong University of Science and Technology Wuhan China

In this work, we demonstrate over two octaves-spanning supercontinuum generation in integrated As2S3 chalcogenide glass waveguides pumped by a 2 μm femtosecond fiber laser. The pump laser provides 182 fs pulses at 50 MHz repetition rate. Through optimization of the waveguide dimensions, a broad supercontinuum spectrum spanning from 0.6 to 2.8 μm was achieved using a 4 μm wide, 5 mm long waveguide with 357 mW coupled pump power. The findings showcase the potential of dispersion engineered, integrated As2S3 photonics for realizing compact, efficient on-chip supercontinuum sources for mid-infrared applications. © 2024, The Authors. All rights reserved.

关键词： Pulse repetition rate

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On-chip Moiré Optical Skyrmion Clusters with Nanoscale Dynamics

arXiv

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arXiv 2024年

作者： Zhang, Lan Wan, Lipeng Deng, Weimin Hou, Liang Zou, Qiushun Wang, Tongbiao Zhao, Daomu Yu, Tianbao School of Physics and Material Science Nanchang University Nanchang330031 China Leiden Institute of Physics Leiden University LeidenCA 2333 Netherlands Faculty of Electrical Engineering and Computer Science Laboratory of Infrared Material and Devices Zhejiang Key Laboratory of Advanced Optical Functional Materials and Devices Advanced Technology Research Institute Ningbo University Zhejiang315211 China Zhejiang Province Key Laboratory of Quantum Technology and Device School of Physics Zhejiang University Hangzhou310027 China

Skyrmions are topological defects belonging to nontrivial homotopy classes in particle theory, and are recognized as a suitable unit in the high-density, low-dissipation microelectronic devices in condensed matter physics. Their remarkably stable topology has recently been observed in electromagnetic waves. For the evanescent fields near a surface, this has been realized so far only for elementary optical skyrmions, with a fixed skyrmion number. Here we introduce the concept of moiré optical skyrmion clusters, where multi-skyrmions are nested to form a large optical skyrmion cluster that is either crystallized or quasi-crystallized as a consequence of the twisted nanostructures. The rapid inverting of optical skyrmion number is achieved in the imperfectly aligned composite nanostructures. This moiré optical skyrmion interaction mechanism is described by a lattice model. Further, the nucleation and collapse of optical skyrmion are studied, where their nanoscale dynamics are revealed with a tiny change of the twist angle. The sudden reversal of the on-chip skyrmion can serve as a precise beacon of the relative alignment deviation between twisted composite nanostructures. Copyright © 2024, The Authors. All rights reserved.

关键词： Electromagnetic waves

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Single-Frequency Continuous-Wave Solid-State 363.8-Nm Ultraviolet Source Generation by Frequency Tripling of a 1091-Nm Fiber Laser

SSRN

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SSRN 2025年

作者： Wei, Zhenshuai Li, Fengtian Men, Shaojie Haung, Lu Zhao, Zhigang Cong, Zhenhua Liu, Zhaojun School of Information Science and Engineering Shandong University Qingdao266237 China Key Laboratory of Laser & Infrared System Shandong University Ministry of Education Qingdao266237 China Signal & Communication Research Institute China Academy of Railway Sciences Corporation Limited Beijing10081 China Shandong Provincial Key Laboratory of Laser Technology and Application Qingdao266237 China

A single-frequency continuous-wave (CW) ultraviolet (UV) solid-state source at 363.8 nm has been demonstrated through the frequency tripling of a high-power, single-frequency, linearly-polarized (LP) 1091-nm laser. This 1091-nm laser, which features a homemade single-frequency distributed Bragg reflector (DBR) seed and can deliver 78-W average power with an optical signal-to-noise ratio (OSNR) exceeding 63 dB and a polarization extinction ratio (PER) of ~15.8 dB. Employing two cascaded periodically poled Mg-doped lithium niobate (PPMgLN) crystals, whose lengths are 30 mm and 20 mm, a single-frequency 545.5-nm source with an average power of 1.85 W and a single-frequency 363.8-nm source with an average power of higher than 20 mW were obtained, when the input power of the 1091-nm laser was just 11.78 W. To the best of our knowledge, this is the first single-frequency solid-state UV source at 363.8 nm, which is usually provided by argon-ion gas laser, thus offering a potential alternative for semiconductor chip inspection applications. © 2025, The Authors. All rights reserved.

关键词： Fiber lasers

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Giant Enhancement of Magnonic Frequency Combs by Exceptional Points

arXiv

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arXiv 2023年

作者： Wang, Congyi Rao, Jinwei Chen, Zhijian Zhao, Kaixin Sun, Liaoxin Yao, Bimu Yu, Tao Wang, Yi-Pu Lu, Wei School of Physical Science and Technology ShanghaiTech University Shanghai201210 China State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai200083 China School of Physics Huazhong University of Science and Technology Wuhan430074 China Interdisciplinary Center of Quantum Information State Key Laboratory of Modern Optical Instrumentation Zhejiang Province Key Laboratory of Quantum Technology and Device School of Physics Zhejiang University Hangzhou310027 China

With their incomparable time–frequency accuracy, frequency combs have significantly advanced precision spectroscopy, ultra-sensitive detection, and atomic clocks. Traditional methods to create photonic, phononic, and magnonic frequency combs hinge on material nonlinearities which are often weak, necessitating high power densities to surpass their initiation thresholds, which subsequently limits their applications. Here, we introduce a novel nonlinear process to efficiently generate magnonic frequency combs (MFCs) by exploiting exceptional points (EPs) in a coupled system comprising a pump-induced magnon mode and a Kittel mode. Even without any cavity, our method greatly improves the efficiency of nonlinear frequency conversion and achieves optimal MFCs at low pump power. Additionally, our novel nonlinear process enables excellent tunability of EPs using the polarization and power of the pump, simplifying MFC generation and manipulation. Our work establishes a synergistic relationship between non-Hermitian physics and MFCs, which is advantages for coherent/quantum information processing and ultra-sensitive detection. © 2023, CC BY-NC-SA.

关键词： Pumps

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Control of Magnon-Polariton Hybridization with a Microwave Pump

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Physical Review Applied 2023年第2期20卷 024074-024074页

作者： Chao Zhang Jinwei Rao C.Y. Wang Z.J. Chen K.X. Zhao Bimu Yao Xu-Guang Xu Wei Lu School of Physical Science and Technology ShanghaiTech University Shanghai 201210 China Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai 200050 China State Key Laboratory of Infrared Physics Shanghai Institute of Technical Physics Chinese Academy of Sciences Shanghai 200083 China

Pump-induced magnon modes (PIMs) are recently discovered elementary excitations in ferrimagnets that offer significant tunability to spin dynamics. Here, we investigate the coupling between a PIM and cavity magnon-polaritons (CMPs) by driving a cavity magnonic system away from equilibrium with a microwave pump. In our experiment, the Walker mode simultaneously couples with the PIM and cavity photons and thus combines two strongly coherent coupling processes in a single cavity structure. Such a PIM-CMP hybridization system acquires complementary properties from both the PIM and CMPs, allowing it to be freely manipulated by the magnetic field, the pump power, and the pump frequency. These coherent manipulations exhibit unique behaviors beyond the intrinsic properties limited by the material nature and electromagnetic boundary conditions, thereby creating opportunities for extending the control of hybrid devices.

关键词： Magnons Polaritons Quantum information with hybrid systems Spintronics Ferrimagnets Optical microcavities Ferromagnetic resonance Microwave techniques

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