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Experimental study and characteristic analysis of sound propagation in upslope waveguides in the Dongsha Sea area

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Chinese Journal of Acoustics 2024年第3期43卷 332-347页

作者： ZHANG Haigang XIE Jinhuai WANG Xiaohan MA Zhikang National Key Laboratory of Underwater Acoustic Technology Harbin Engineering UniversityHarbin150001 Key Laboratory of Marine Information Acquisition and Security(Harbin Engineering University) Ministry of Industry and Information TechnologyHarbin150001 College of Underwater Acoustic Engineering Harbin Engineering UniversityHarbin150001

An underwater acoustic propagation experiment was conducted in the Dongsha Sea to investigate the influence of upslope waveguide environments on sound *** experiment revealed a significant attenuation of acoustic energy at the slope crest.A realistic waveguide environment model was established,and the parabolic equation theory was used to calculate the acoustic propagation loss,confirming the observed impact of the sloping environment on sound *** tracing methods were further employed to discuss and analyze the mechanism behind the sharp decrease in acoustic *** results indicate that during upslope propagation in an environment with a negative sound speed gradient,the acoustic energy effectively reaching the slope crest varies significantly due to factors such as source depth,slope inclination,horizontal distance,and bottom sound *** source depths,steeper slopes,and lower bottom sound speeds result in weaker acoustic energy propagation to the slope ***,compared to horizontal waveguides,increased horizontal distances in upslope waveguides lead to more pronounced acoustic energy attenuation.

关键词： waveguide waveguides sound

Thermally induced dephasing of high power second harmonic generation in MgO:LiNbO_3 waveguides

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Chinese Optics Letters 2011年第12期9卷 65-68页

作者：李国辉徐信业 State Key Laboratory of Precision Spectroscopy and Department of Physics East China Normal University

High power second harmonic generation （SHG） in MgO-doped LiNbO3 waveguides is investigated using a three-dimensional （3D） coupled thermo-optical model. Simulations performed for a 1 lll.6-nm funda- mental laser show the influence of the absorptions and the thermally induced dephasing on the conversion efficieneies of the different waveguides. The onset of the thermally induced dephasing effect for each waveguide is also indicated. As a result of high light intensity in the waveguide, noniinear absorptions are identified as the possible main factors in efficiency losses in specific cases.

关键词： Conversion efficiency Nonlinear optics Three dimensional waveguides

Broadband supercontinuum generation in nitrogen-rich silicon nitride waveguides using a 300 mm industrial platform

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Photonics Research 2020年第3期8卷 352-358页

作者： CHRISTIAN LAFFORGUE SYLVAIN GUERBER JOAN MANEL RAMIREZ GUILLAUME MARCAUD CARLOS ALONSO-RAMOS XAVIER LE ROUX DELPHINE MARRIS-MORINI ERIC CASSAN CHARLES BAUDOT FRéDéRIC BOEUF SéBASTIEN CREMER STéPHANE MONFRAY LAURENT VIVIEN Centre for Nanoscience and Nanotechnology(C2N) CNRSUniversitéParis-SudUniversitéParis-SaclayUMR 900191405 Orsay CedexFrance Technologie R&D STMicroelectronicsSAS850 rue Jean Monnet38920 CrollesFrance III-V lab a joint venture from Nokia Bell LabsThales and CEA1 Avenue Augustin Fresnel91767 Palaiseau CedexFrance

We report supercontinuum generation in nitrogen-rich(N-rich)silicon nitride waveguides fabricated through back-end complementary-metal-oxide-semiconductor(CMOS)-compatible processes on a 300 mm *** pumping in the anomalous dispersion regime at a wavelength of 1200 nm,two-octave spanning spectra covering the visible and near-infrared ranges,including the O band,were *** calculations showed that the nonlinear index of N-rich silicon nitride is within the same order of magnitude as that of stoichiometric silicon nitride,despite the lower silicon content.N-rich silicon nitride then appears to be a promising candidate for nonlinear devices compatible with back-end CMOS processes.

关键词： waveguides pumping nitride

Ultrashort Bessel beam photoinscription of Bragg grating waveguides and their application as temperature sensors

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Photonics Research 2019年第7期7卷 121-129页

作者： Guodong Zhang Guanghua Cheng Manoj K.Bhuyan Ciro D'Amico Yishan Wang Razvan Stoian Laboratoire Hubert Curien UMR 5516 CNRSUniversite de LyonUniversite Jean Monnet42000 Saint EtienneFrance State Key Laboratory of Transient Optics and Photonics Xi'an Institute of Optics and Precision MechanicsCASXi'an 710119China School of Electronics and Information Northwestern Polytechnical UniversityXi'an 710072China Academy of Scientific and Innovative Research CSIR-Central Scientific Instruments OrganizationChandigarh 160030India Optical Devices and Systems Division CSIR-Central Scientific Instruments OrganizationChandigarh 160030India

Ultrashort pulsed Bessel beams with intrinsic nondiffractive character and potential strong excitation confinement down to 100nm can show a series of advantages over Gaussian beams in fabricating efficient Bragg grating waveguides(BGWs).In this work, we focus on parameter management for the inscription of efficient BGWs using the point-by-point method employing Bessel *** to their high aspect ratio, the resulting one-dimensional void-like structures can section the waveguides and interact efficiently with the optical modes. Effective first-order BGWs with low birefringence can then be fabricated in bulk fused silica. By controlling the size and the relative location of grating voids via the Bessel pulse energy and scan velocities, the resonant behaviors of BGWs can be well regulated.A high value of 34 dB for 8 mm length is achieved.A simple predictive model for BGWs is proposed for analyzing the influences of processing parameters on the performance of BGWs. The technique permits multiplexing several gratings in the same *** to eight grating traces were straightforwarcliy inscribed into the waveguide in a parallel-serial combined mode, forming the multiplex *** an application, the multiplex BGW sensor with two resonant peaks is proposed and fabricated for improving the reliability of temperature detection.

关键词： photoinscription waveguides temperature detection

Compact low-birefringence polarization beam splitter using vertical-dual-slot waveguides in silicon carbide integrated platforms

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Photonics Research 2022年第1期10卷 I0008-I0013页

作者： XIAODONG SHI JINGJING ZHANG WEICHEN FAN YAOQIN LU NIANHUA PENG KARSTEN ROTTWITT AND HAIYAN OU DTU Fotonik Technical University of DenmarkDK-2800 LyngbyDenmark Institute of Mirco/Nano Optoelectronic and Terahertz Technology Jiangsu UniversityZhenjiang 212013China Surrey Ion Beam Centre Surrey UniversityGuildfordGU27XHUK

The polarization beam splitter is a key component for polarization manipulation in photonic integrated circuits,but it is challenging to design for low-refractive-index optical materials,due to the low birefringence of the *** propose what we believe is a novel compact vertical-dual-slot waveguide-based coupling scheme for silicon carbide,enabling efficient low-birefringence polarization splitting by extensively modulating the transverse-magnetic mode *** numerically and experimentally demonstrate the device in the 4H-siliconcarbide-on-insulator integrated platform,with a small footprint of 2.2 μm × 15 μ*** device,easy to fabricate via a single lithography process as other components on the chip,exhibits low insertion loss of 13 dB,over 80 nm wavelength range.

关键词： polarization waveguides waveguide

Optical meta-waveguides for integrated photonics and beyond

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Light(Science & Applications) 2021年第12期10卷 2263-2306页

作者： Yuan Meng Yizhen Chen Longhui Lu Yimin Ding Andrea Cusano Jonathan A.Fan Qiaomu Hu Kaiyuan Wang Zhenwei Xie Zhoutian Liu Yuanmu Yang Qiang Liu Mali Gong Qirong Xiao Shulin Sun Minming Zhang Xiaocong Yuan Xingjie Ni State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua University100084 BeijingChina Shanghai Engineering Research Center of Ultra-Precision Optical Manufacturing and School of Information Science and TechnologyFudan UniversityShanghai 200433China School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China Department of Electrical Engineering Pennsylvania State UniversityUniversity ParkPA 16802USA Optoelearonic Division Department of EngineeringUniversity of Sannio1-82100 BeneventoItaly Department of Electrical Engineering Stanford UniversityStanfordCA 94305USA Nanophotonics Research Centre Shenzhen Key Laboratory of Micro-Scale Optical Information TechnologyShenzhen UniversityShenzhen 518060China Key Laboratory of Photonic Control Technology Ministry of EducationTsinghua University100084 BeijingChina Yiwu Research Institute of Fudan University Chengbei RoadYiwu City 322000 ZhejiangChina Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074 HubeiChina

The growing maturity of nanofabrication has ushered massive sophisticated optical structures available on a photonic *** integration of subwavelength-structured metasurfaces and metamaterials on the canonical building block of optical waveguides is gradually reshaping the landscape of photonic integrated circuits,giving rise to numerous metawaveguides with unprecedented strength in controlling guided electromagnetic ***,we review recent advances in meta-structured waveguides that synergize various functional subwavelength photonic architectures with diverse waveguide platforms,such as dielectric or plasmonic waveguides and optical *** results and representative applications are comprehensively *** physical models with explicit design tutorials,either physical intuition-based design methods or computer algorithms-based inverse designs,are cataloged as *** highlight how meta-optics can infuse new degrees of freedom to waveguide-based devices and systems,by enhancing light-matter interaction strength to drastically boost device performance,or offering a versatile designer media for manipulating light in nanoscale to enable novel *** further discuss current challenges and outline emerging opportunities of this vibrant field for various applications in photonic integrated circuits,biomedical sensing,artificial intelligence and beyond.

关键词： waveguides waveguide beyond

Photon propagation control on laser-written photonic chips enabled by composite waveguides

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Photonics Research 2023年第5期11卷 829-838页

作者： ZE-ZHENG LI ZHEN-NAN TIAN ZHONG-TIAN LI YANG OUYANG QI-DAI CHEN HONG-BO SUN State Key Laboratory of Integrated Optoelectronics College of Electronic Science and EngineeringJilin UniversityChangchun 130012China State Key Laboratory of Precision Measurement Technology and Instruments Department of Precision InstrumentTsinghua UniversityBeijing 100084China

Femtosecond laser direct writing(Fs LDW)three-dimensional(3D)photonic integrated circuits(PICs)can realize arbitrary arrangement of waveguide arrays and coupling ***,they are capable of directly constructing arbitrary Hamiltonians and performing specific computing tasks crucial in quantum simulation and ***,the propagation constantβis limited to a narrow range in single-mode waveguides by solely changing the processing parameters,which greatly hinders the design of Fs LDW *** study proposes a composite waveguide(CWG)method to increase the range ofβ,where a new single-mode composite waveguide comprises two adjacent circular *** a result,the photon propagation can be controlled and the variation range ofβcan be efficiently enlarged by approximately two times(Δβ~36 cm-1).With the CWG method,we successfully realize the most compact Fs LDW directional couplers with a 9μm pitch in a straight-line form and achieve the reconstruction of the Hamiltonian of a Hermitian ***,the study represents a step further toward the fine control of the coupling between waveguides and compact integration of Fs LDW PICs.

关键词： waveguide waveguides composite

Reconfigurable generation of optical vortices based on forward stimulated intermodal Brillouin scattering in subwavelength-hole photonic waveguides

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Photonics Research 2019年第7期7卷 69-76页

作者： DAE SEOK HAN MYEONG SOO KANG Department of Physics Korea Advanced Institute of Science and Technology(KAIST)

An all-optically reconfigurable generation of optical vortices would be highly beneficial to the implementation of next-generation optical communication and advanced information processing. The previously demonstrated approaches based on the parametric nonlinear optical processes, however, have exhibited limited conversion efficiency due to the group velocity mismatch and nonlinear phase shifts, and require the cumbersome preparation of either the optical element or initial seed beam having a non-zero topological charge. Here, we propose and analyze a novel scheme for highly efficient all-optical generation and control of optical vortices based on the dynamic acoustic vortex grating created by forward stimulated intermodal Brillouin scattering in a subwavelength-hole photonic waveguide. The dual-frequency pump beams in two different hybrid optical modes drive an acoustic vortex mode, which transforms a signal in the fundamental optical mode into an optical vortex mode. This scheme not only eliminates the need for the initial preparation of an angular-momentum-carrying medium or an optical vortex seed but also guarantees high modal purity and nearly 100% conversion efficiency assisted by the energymomentum conservation. We also investigate the feasibility and practicability of the subwavelength-hole waveguides by examining the intermodal conversion efficiency and robustness of guidance of the optical vortices,taking into account the impact of the Kerr-type nonlinear effects on the intermodal Brillouin interactions based on our rigorous full-vectorial analytical theory.

关键词： Reconfigurable generation waveguides effects

Intermodal frequency generation in silicon-rich silicon nitride waveguides

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Photonics Research 2019年第6期7卷 615-621页

作者： C.LACAVA T.DOMINGUEZ BUCIO A.Z.KHOKHAR P.HORAK Y.JUNG F.Y.GARDES D.J.RICHARDSON P.PETROPOULOS F.PARMIGIANI Optoelectronics Research Centre University of SouthamptonS0171BJ Southampton UK Currently at Microsoft Research UK CB1 2FB Cambridge UK

Dispersion engineering in optical waveguides allows applications relying on the precise control of phase matching conditions to be implemented. Although extremely effective over relatively narrow band spectral regions,dispersion control becomes increasingly challenging as the bandwidth of the process of interest *** matching can also be achieved by exploiting the propagation characteristics of waves exciting different spatial modes of the same waveguide. Phase matching control in this case relies on achieving very similar propagation characteristics across two, and even more, waveguide modes over the wavelengths of interest, which may be rather far from one another. We demonstrate here that broadband(>40 nm) four-wave mixing can be achieved between pump waves and a signal located in different bands of the communications spectrum(separated by50 nm) by exploiting interband nonlinearities. Our demonstration is carried out in the silicon-rich silicon nitride material platform, which allows flexible device engineering, allowing for strong effective nonlinearity at telecommunications wavelengths without deleterious nonlinear-loss effects.

关键词： Intermodal frequency silicon-rich silicon nitride waveguides