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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

Visual observation of photonic Floquet–Bloch oscillations

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Light(Science & Applications) 2024年第5期13卷 921-929页

作者： Zhen Zhang Yuan Li xiankai sun Xuewen Shu Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhanHubei 430074China Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina

Bloch oscillations(BOs),an important transport phenomenon,have been studied extensively in static systems but remain mysterious in Floquet ***,by harnessing notions from photonic analogy,we propose a generalization of the existing BOs in photonic Floquet lattices,namely the“photonic Floquet–Bloch oscillations”,which refer to rescaled photonic Bloch oscillations with a period of extended least common multiple of the modulation period and the Bloch oscillation ***,we report the first visual observation of such photonic Floquet–Bloch oscillations(FBOs)by employing waveguide fluorescence *** significantly,the FBOs surpass the existing BOs in Floquet systems and exhibit exotic properties on their own,including fractal spectrum and fractional Floquet *** new transport mechanism offers an intriguing method of wave manipulation that may contribute to rapidly developing fields in photonics,condensed matter physics,and quantum physics.

关键词： Bloch analogy generalization

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

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Journal of Semiconductors 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

Click chemistry-based pre-targeting cell delivery for cartilage regeneration

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Regenerative Biomaterials 2021年第3期8卷 11-21页

作者： Cynthia M.Co Samira Izuagbe Jun Zhou Ning Zhou xiankai sun Joseph Borrelli Liping Tang Department of Bioengineering University of Texas at ArlingtonPO Box 19138ArlingtonTX 76019USA Department of Radiology University of Texas Southwestern MedicalDallasTX 75390USA

A fraction of the OA patient population is affected by post-traumatic osteoarthritis(PTOA)following acute joint *** or reversing the progression of PTOA following joint injury could improve long-term functional outcomes,reduced disability,and medical *** more effectively treat articular cartilage injury,we have developed a novel cell-based therapy that involves the pretargeting of apoptotic chondrocytes and the delivery of healthy,metabolically active chondrocytes using click ***,a pre-targeting agent was prepared via conjugating apoptotic binding peptide(ApoPep-1)and trans-cyclooctene(TCO)onto polyethylene glycol(PEG)polymer *** pre-targeting agent would be introduced to injured areas of articular cartilage,leading to the accumulation of TCO groups on the injured areas from actively binding to apoptotic ***,methyltetrazine(Tz)-bearing chondrocytes would be immobilized on the surface of TCO-coated injured cartilage via Tz-TCO click chemistry *** an ex vivo human cartilage explant PTOA model,the effectiveness of this new approach was *** studies show that this novel approach(Tz-TCO click chemistry)significantly enhanced the immobilization of healthy and metabolically active chondrocytes to the areas of apoptotic *** analyses demonstrated that this treatment regimen would significantly reduce the area of cartilage degeneration and enhance ECM *** results support that Tz-TCO click chemistry-mediated cell delivery approach has great potential in clinical applications for targeting and treatment of cartilage injury.

关键词： chondrocyte cartilage regeneration cell therapy click chemistry

Genetically optimized on-chip wideband ultracompact reflectors and Fabry–Perot cavities

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Photonics Research 2017年第6期5卷 17-21页

作者： ZEJIE YU HAORAN CUI xiankai sun Department of Electronic Engineering The Chinese University of Hong Kong

Reflectors are an essential component for on-chip integrated photonics. Here, we propose a new method for designing reflectors on the prevalent thin-film-on-insulator platform by using genetic-algorithm *** simulation, the designed reflector with a footprint of only 2.16 μm× 2.16 μm can achieve ~97% reflectivity and 1 dB bandwidth as wide as 220 nm. The structure is composed of randomly distributed pixels and is highly robust against the inevitable corner rounding effect in device fabrication. In experiment, we fabricated on-chip Fabry–Perot(FP) cavities constructed from optimized reflectors. Those FP cavities have intrinsic quality factors of>2000 with the highest value beyond 4000 in a spectral width of 200 nm. The reflectivity fitted from the FP cavity resonances is >85% in the entire wavelength range of 1440–1640 nm and is beyond 95% at some *** fabrication processes are CMOS compatible and require only one step of lithography and etch. The devices can be used as a standard module in integrated photonic circuitry for wide applications in on-chip semiconductorlaser structures and optical signal processing.

关键词： FP Perot cavities Genetically optimized on-chip wideband ultracompact reflectors and Fabry

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

Room-temperature continuous-wave topological Dirac-vortex microcavity lasers on silicon

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Light(Science & Applications) 2023年第11期12卷 2451-2458页

作者： Jingwen Ma Taojie Zhou Mingchu Tang Haochuan Li Zhan Zhang Xiang Xi Mickael Martin Thierry Baron Huiyun Liu Zhaoyu Zhang Siming Chen xiankai sun Department of Electronic Engineering The Chinese University of Hong KongShatinNew TerritoriesHong Kong SARChina School of Science and Engineering The Chinese University of Hong KongShenzhenGuangdong 518172China Department of Electronic and Electrical Engineering University College LondonLondon WC1E 7JEUK UniversitéGrenoble Alpes CNRSCEA-LETIMINATECGrenoble INPLTMF-38054 GrenobleFrance

Robust laser sources are a fundamental building block for contemporary information *** from condensed-matter physics,the concept of topology has recently entered the realm of optics,offering fundamentally new design principles for lasers with enhanced *** analogy to the well-known Majorana fermions in topological superconductors,Dirac-vortex states have recently been investigated in passive photonic systems and are now considered as a promising candidate for robust ***,we experimentally realize the topological Diracvortex microcavity lasers in InAs/InGaAs quantum-dot materials monolithically grown on a silicon *** observe room-temperature continuous-wave linearly polarized vertical laser emission at a telecom *** confirm that the wavelength of the Dirac-vortex laser is topologically robust against variations in the cavity size,and its free spectral range defies the universal inverse scaling law with the cavity *** lasers will play an important role in CMOS-compatible photonic and optoelectronic systems on a chip.

关键词： wave continuous cavity

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

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