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Integrated bound-state-in-the-continuum photon-pair source

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Photonics Research 2024年第6期12卷 1322-1327页

作者： FAN YE YUE QIN CHENFEI CUI xiankai sun HON KI TSANG Department of Electronic Engineering The Chinese University of Hong KongHong KongChina

Integrated photon-pair sources based on spontaneous parametric down conversion(SPDC)in novel high-χ^((2))materials are used in quantum photonic systems for quantum information processing,quantum metrology,and quantum ***,the need for extensive fabrication process development and optimization of dry-etching processes significantly impedes the rapid exploration of different material platforms for low-loss quantum photonic ***,bound states in the continuum(BICs)have emerged as a promising approach for realizing ultralow-loss integrated photonic circuits without requiring an etching *** realizations of BIC photonic circuits have,however,been limited primarily to the classical ***,we explore the BIC phenomena in the quantum regime and show that the etchless BIC platform is suitable for use in integrated entangled photon-pair sources based on the SPDC process in high-χ^((2))*** lithium niobate as an example,we demonstrate photon-pair generation at telecommunication wavelengths,attaining a maximum internal generation rate of 3.46 MHz,a coincidence-to-accidental ratio of 5773,and an experimental two‐photon interference visibility of 94%.Our results demonstrate that the BIC platform can be used for quantum photonic circuits,and this will enable the rapid exploration of different emergingχ^((2))materials for possible use in integrated quantum photonics in the future.

关键词： process. quantum continuum

Terahertz topological photonic waveguide switch for on-chip communication

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Photonics Research 2022年第4期10卷 1090-1096页

作者： Xudong Liu Jialiang Huang Hao Chen Zhengfang Qian JlNGWEN Ma xiankai sun Shuting Fan Yiwen sun Department of Biomedical Engineering School of MedicineShenzhen UniversityShenzhen 518060China Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province College of Physics and Optoelectronics EngineeringShenzhen UniversityShenzhen 518060China Department of Electronic Engineering The Chinese University of Hong KongHong KongChina

Terahertz(THz)topological photonic structures are promising for last-centimeter communication in intra/interchip communication systems because they support bit-error-free THz signal transmission with topological *** and dynamically tunable THz topological photonic components have not yet been experimentally ***,we experimentally demonstrate a THz topological switch(270-290 GHz)based on a valley Hall photonic crystal structured high-resistivity silicon substrate,in which the THz waves can be dynamically turned on/off by an external 447 nm continuous-wave *** device exhibited an on/off ratio of 19 dB under a pumping light intensity of 240 mW/mm^(2).The 3 dB switching bandwidth was〜60 kHz.

关键词： communication waveguide tunable

Highly tunable broadband coherent wavelength conversion with a fiber-based optomechanical system

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Advanced Photonics 2022年第5期4卷 27-35页

作者： Xiang Xi Chang-Ling Zou Chun-Hua Dong xiankai sun The Chinese University of Hong Kong Department of Electronic EngineeringShatinHong Kong SARChina University of Science and Technology of China CAS Key Laboratory of Quantum InformationHefeiChina University of Science and Technology of China CAS Center for Excellence in Quantum Information and Quantum PhysicsHefeiChina

Modern information networks are built on hybrid systems working at disparate optical *** interconnects for converting photons between different wavelengths are highly *** coherent interconnects have conventionally been realized with nonlinear optical effects,those systems require demanding experimental conditions,such as phase matching and/or cavity enhancement,which not only bring difficulties in experimental implementation but also set a narrow tuning bandwidth(typically in the MHz to GHz range as determined by the cavity linewidth).Here,we propose and experimentally demonstrate coherent information transfer between two orthogonally propagating light beams of disparate wavelengths in a fiber-based optomechanical system,which does not require phase matching or cavity enhancement of the pump *** coherent process is demonstrated by interference phenomena similar to optomechanically induced transparency and *** scheme not only significantly simplifies the experimental implementation of coherent wavelength conversion but also extends the tuning bandwidth to that of an optical fiber(tens of THz),which will enable a broad range of coherent-optics-based applications,such as optical sensing,spectroscopy,and communication.

关键词： cavity optomechanics coherent wavelength conversion optomechanically induced transparency

Acousto-optic modulation of photonic bound state in the continuum

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Light(Science & Applications) 2020年第1期9卷 1967-1975页

作者： Zejie Yu xiankai sun Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina

Photonic bound states in the continuum(BICs)have recently been studied in various systems and have found wide applications in sensors,lasers,and *** BICs in photonic integrated circuits enables low-loss light guidance and routing in low-refractive-index waveguides on high-refractive-index substrates,which opens a new avenue for integrated photonics with functional single-crystal ***,we demonstrate high-quality integrated lithium niobate microcavities inside which the photonic BIC modes circulate and further modulate these BIC modes acoustooptically by using piezoelectrically actuated surface acoustic waves at microwave *** a high acoustooptic modulation frequency,the acousto-optic coupling is well situated in the resolved-sideband *** leads to coherent coupling between microwave and optical photons,which is exhibited by the observed electro-acoustooptically induced transparency and ***,our devices serve as a paradigm for manipulating and controlling photonic BICs on a chip,which will enable many other applications of photonic BICs in the areas of microwave photonics and quantum information processing.

关键词： microwave enable refractive

Observation of mechanical bound states in the continuum in an optomechanical microresonator

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Light(Science & Applications) 2022年第12期11卷 2931-2938页

作者： Yue Yu Xiang Xi xiankai sun Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina

Bound states in the continuum(BICs)are a type of waves that are perfectly confined in the continuous spectrum of radiating waves without interaction with ***,we fabricated,with CMOS-compatible processes on a silicon chip,a wheel-shaped optomechanical microresonator,in which we experimentally observed the BIC in the micromechanical *** BIC results from destructive interference between two dissipative mechanical modes of the microresonator under broken azimuthal *** BICs can be obtained from devices with large and robust supporting structures with variable sizes,which substantially reduces fabrication difficulty and allows for versatile application *** results open a new way of phonon trapping in micromechanical structures with dissipation channels,and produce long phonon lifetimes that are desired in many mechanical applications such as mechanical oscillators,sensors,and quantum information processors.

关键词： phonon continuum states

Circular Bragg lasers with radial PT symmetry:Design and analysis with a coupled-mode approach

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Photonics Research 2018年第5期6卷 I0019-I0023页

作者： ZIYAO FENG JINGWEN MA ZEJIE YU xiankai sun Department of Electronic Engineering The Chinese University of Hong Kong

Parity–time(PT) symmetry has been demonstrated in the frame of classic optics. Its applications in laser science have resulted in unconventional control and manipulation of resonant modes. PT-symmetric periodic circular Bragg lasers were previously proposed. Analyses with a transfer-matrix method have shown their superior properties of reduced threshold and enhanced modal discrimination between the radial modes. However, the properties of the azimuthal modes were not analyzed, which restricts further development of circular Bragg lasers. Here, we adopt the coupled-mode theory to design and analyze chirped circular Bragg lasers with radial PT symmetry. The new structures possess more versatile modal control with further enhanced modal discrimination between the azimuthal modes. We also analyze azimuthally modulated circular Bragg lasers with radial PT symmetry, which are shown to achieve even higher modal discrimination.

关键词： Circular Bragg lasers with radial PT symmetry:Design and analysis with a coupled-mode approach PT

Realization of quantum ground state in an optomechanical crystal cavity

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Science China(Physics,Mechanics & Astronomy) 2023年第12期66卷 110-118页

作者： Yu Wang Zhi-Peng Shi Hong-Yi Kuang Xiang Xi Shuai Wan Zhen Shen Pi-Yu Wang Guan-Ting Xu xiankai sun Chang-Ling Zou Guang-Can Guo Chun-Hua Dong CAS Key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230088China Department of Electronic Engineering The Chinese University of Hong KongHong KongChina Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China

Ground-state cooling of the mechanical degree of freedom is a fundamental requirement for quantum state transfer between relevant optical and mechanical ***,we fabricate optomechanical crystal cavities with co-localized mechanical and optical modes on a monolithic *** typical linewidth of the optical modes at telecom wavelength is as low as 0.95 GHz,and the mechanical resonant frequency is around 5 GHz,which means the optomechanical system can be operated in the resolved sideband *** the statistics of the asymmetry in the scattering rates of red and blue detuning driving processes,we initialize and characterize the mechanical system in its quantum ground-state of motion,with a mean thermal phonon occupancy nth=0.018±0.0034,corresponding to a mode temperature of 57.3 m *** is a general platform for quantum state transfer between relevant optical and mechanical systems,as well as the quantum entanglement between these systems.

关键词： microcavity cavity optomechanics optomechanical crystal cavity quantum ground state

Broadband meta-converters for multiple Laguerre-Gaussian modes

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Photonics Research 2021年第9期9卷 1689-1698页

作者： HUADE MAO YU-XUAN REN YUE YU ZEJIE YU xiankai sun SHUANG ZHANG KENNETH KYWONG Department of Electrical and Electronic Engineering The University of Hong KongHong KongChina Institute for Translational Brain Research Shanghai Medical SchoolFudan UniversityShanghai 200032China Department of Electronic Engineering The Chinese University of Hong KongHong KongChina Department of Physics The University of Hong KongHong KongChina Advanced Biomedical Instrumentation Centre Hong Kong Science ParkHong KongChina

Metasurface provides miniaturized devices for integrated ***,we design and realize a meta-converter to transform a plane-wave beam into multiple Laguerre-Gaussian(LG)modes of different orders at various diffraction *** metasurface is fabricated with Au nano-antennas,which vary in length and orientation angle for modulation of both the phase and the amplitude of a scattered wave,on a silica *** error analysis suggests that the metasurface design is robust over a 400 nm wavelength *** work presents the manipulation of LG beams through controlling both radial and azimuthal orders,which paves the way in expanding the communication channels by one more dimension(i.e.,radial order)and demultiplexing different modes.

关键词： orders radial Gaussian

Fundamentals and applications of photonic waveguides with bound states in the continuum

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半导体学报:英文版 2023年第10期44卷 11-24页

作者： Zejie Yu He Gao Yi Wang Yue Yu Hon Ki Tsang xiankai sun Daoxin Dai Centre for Optical and Electromagnetic Research State Key Laboratory for Modern Optical InstrumentationZhejiang Provincial Key Labora-tory for Sensing TechnologiesInternational Research Center for Advanced PhotonicsCollege of Optical Science and EngineeringZhejiang Uni-versityHangzhou 310058China Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina Jiaxing Key Laboratory of Photonic Sensing&Intelligent Imaging Jiaxing 314000China Intelligent Optics&Photonics Research Center Jiaxing Research Institute Zhejiang UniversityJiaxing 314000China Ningbo Research Institute Zhejiang UniversityNingbo 315100China

Photonic waveguides are the most fundamental element for photonic integrated circuits(PICs).Waveguide properties,such as propagation loss,modal areas,nonlinear coefficients,etc.,directly determine the functionalities and performance of ***,the emerging waveguides with bound states in the continuum(BICs)have opened new opportunities for PICs because of their special properties in resonance and ***,we review the recent progress of PICs composed of waveguides with ***,fundamentals including background physics and design rules of a BIC-based waveguide will be ***,two types of BIC-based waveguide structures,including shallowly etched dielectric and hybrid waveguides,will be ***,the challenges and opportunities of PICs with BICs will be discussed.

关键词： photonic waveguide bound states in the continuum integrated photonics