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Orbital angular momentum conversion of acoustic vortex beams via planar lattice coupling

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Chinese Physics B 2024年第9期33卷 413-420页

作者： Qingbang Han Zhipeng Liu Cheng Yin Simeng Wu Yinlong Luo Zixin Yang Xiuyang Pang Yiqiu Wang xuefen kan Yuqiu Zhang Qiang Yu Jian Wu College of Information Science and Engineering Hohai UniversityChangzhou 213200China College of Advanced Interdisciplinary Studies Nanhu Laser LaboratoryNational University ofDefense TechnologyChangsha 410073China School of Transportation Engineering Jiangsu Shipping CollegeNantong 226010China i-Lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou215123China

Orbital angular momentum(OAM)conversion is critical in understanding interactions between a structural sound field and a planar ***,we explore the evolution of a monochromatic acoustic vortex beam(AVB)that is scattered by a phononic crystal(PnC)or a correlated random *** phenomenon is ascribed to the enhanced orbit–orbit angular momentum coupling induced by the band *** modifying the coupling condition,accurate and continuous micromanipulation of AVBs can be achieved,including the transverse/lateral gravity shift,the dynamics of the phase singularities,and the spatial distribution of acoustic pressure,*** research provides insight to the inhomogeneous coupling of AVBs with both propagating Bloch waves and localized Anderson modes,and may facilitate development of novel OAM-based acoustic devices for active sound field manipulation.

关键词： acoustic vortex beam phononic crystal Anderson localization Imbert–Fedorov effect

通过磨砂玻璃滤光片产生浴帘效应抑制水下噪声

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江西师范大学学报（自然科学版） 2024年第1期48卷 59-62,68页

作者：吴承宇殷澄李翠翠史健阚雪芬吴坚桑明煌王贤平江西师范大学物理与通信电子学院江西南昌330022 河海大学物联网工程学院江苏常州213022 江苏航运职业技术学院交通工程学院江苏南通226010 国防科技大学前沿交叉学科学院湖南长沙410073

该文提出并实验验证了一种可通过磨砂玻璃滤光片诱导的浴帘效应来抑制水下噪声的方法.在实验中,在水槽中的水被蓝色墨水污染,以添加随机分布的散射颗粒,并使用蠕动泵产生湍流噪声.携带图像信息的扩展光束穿过水槽,进入电荷耦合器(CCD)... 详细信息

该文提出并实验验证了一种可通过磨砂玻璃滤光片诱导的浴帘效应来抑制水下噪声的方法.在实验中,在水槽中的水被蓝色墨水污染,以添加随机分布的散射颗粒,并使用蠕动泵产生湍流噪声.携带图像信息的扩展光束穿过水槽,进入电荷耦合器(CCD)用于图像记录.对比结果表明:由于磨砂玻璃滤光片起到空间低通滤光的作用,所以可以大大提高记录图像的可见度;通过高斯拉普拉斯(LoG)算法和人工智能算法,插入磨砂玻璃滤光片的图像处理效果也优于没有磨砂玻璃滤光片的.该方法方便且经济,在资源勘探和海底考古中具有潜在的应用价值.

关键词：水下噪声磨砂玻璃浴帘效应图像处理

维普期刊数据库博看期刊

Loss induced negative refraction and super-prism effect at highly absorptive interface

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Chinese Physics B 2019年第5期28卷 101-105页

作者： Jian Wu Tao Wang Tianyue Hou xuefen kan Cheng Yin Pu Zhou Zhuangqi Cao College of Advanced Interdisciplinary Studies National University of Defense Technology Hunan Provincial Key Laboratory of High Energy Laser Technology Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai University College of Physics and Astronomy Shanghai Jiao Tong University

It is well-established that waves are inhomogeneous in a lossy isotropic medium, and the validation of the classical Snell's law is still questionable for light refraction at the dissipative and dispersive interface. With high absorption, direct experimental investigation is rather difficult due to the extremely short penetration depth; i.e., the skin depth. In this paper, a simple and unified description of this issue is proposed, which can be applied to both materials with anomalous dispersion and in the Drude region. The gradient ▽_k~ω is found to be incident angle θ_i-dependent, and the direction of the group velocity may deviate significantly from the phase velocity due to the loss induced permittivity structure. The physics behind the negative refraction effect is explained, and a novel loss induced super-prism effect is also predicted.

关键词： Snell’s Law Drude model anomalous dispersion lossy isotropic media

Propagation dynamics of off-axis noncanonical vortices in a collimated Gaussian beam

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Chinese Physics B 2019年第3期28卷 192-196页

作者： Cheng Yin xuefen kan Hailang Dai Minglei Shan Qingbang Han Zhuangqi Cao Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai UniversityChangzhou 213022China The State Key Laboratory on Fiber Optic Local Area Communication Networks and Advanced Optical Communication Systems Shanghai JiaoTong UniversityShanghai 200240China

It is widely accepted that an off-axis noncanonical vortex moves across the free-space diffracting Gaussian beam without rotation. But our analysis shows that the vortex swirls a while before it approaches infinite. By neglecting the divergence of the host beam, we focus on this rotation characteristics of the vortices in linear homogeneous media. For the symmetrical host beam, it is found that the vortex moves along an elliptical trajectory, while the topological charge and the angular momentum of the vortex core relative to the beam axis are conserved. For the asymmetrical host beam, the vortex trajectory is rather complicated, since the noncanonical parameter varies as the light propagates, resulting in topological charge inversion. But we find that the vortices are always confined in a rectangular area, and the rotation direction is determined by the topological charge.

关键词： noncanonical optical vortex topological charge inversion

Negative Refraction at a Lossy Interface and a Bold Hypothesis via Complex Frequency

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Journal of Shanghai Jiaotong university(Science) 2019年第5期24卷 545-550页

作者： YIN Cheng kan xuefen SHAN Minglei CAO Zhuangqi WANG Xianping Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai UniversityChangzhou213022JiangsuChina Department of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai200240China Jiangxi Key Laboratory of Optoelectronic and Telecommunication Department of PhysicsJiangxi Normal UniversityNanchang330022China

We investigate the negative refraction effect at a planar interface of a highly absorptive material,where the direct experimental verification is difficult because of the loss-induced skin depth effect. An apparent contradiction occurs when we try to determine the group velocity direction by the method of equifrequency contours(EFCs) in detail. This contradiction forbids any physical solution to be found for negative *** conclude that this paradox is mainly caused by the definition of complex wavevector ■which is conventionally adopted in the case of complex permittivity. The complex wavevector may result in ambiguously defined optical path, which limits the application of the classical Snell’s law. We propose a bold suggestion that the complex wavevector■ should be replaced by a complex frequency■ . Therefore, the optical path can always be defined as real. The proposed hypothesis is capable of resolving the contradiction about the loss-induced negative refraction,and the obtained theoretical prediction fits well with the reported experimental results.

关键词： Drude material negative refraction anomalous dispersion complex frequency

Sb2Te3 topological insulator for 52 nm wideband tunable Yb-doped passively Q-switched fiber laser

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Frontiers of Information Technology & Electronic Engineering 2021年第3期22卷 287-295页

作者： Tao WANG Qiang YU Kun GUO Xinyao SHI xuefen kan Yijun XU Jian WU Kai ZHANG Pu ZHOU College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China i-Lab Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Jiangsu Key Laboratory of Power Transmission and Distribution Equipment Technology Hohai UniversityChangzhou 213022China Key Laboratory of Nano-Devices and Applications Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China Vacuum Interconnected Nanotech Workstation Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

Topological insulator Sb2Te3 has the advantage of broadband saturable absorption from the visible to the infrared ***,the two-dimensional material Sb2Te3 saturable absorber(SA)of the topological insulator family was first applied experimentally in a wideband tunable passively Q-switched Yb-doped fiber ***-quality Sb2Te3 crystals were synthesized by the flux zone *** Sb2Te3 SA with fewer layers was further prepared via a modified mechanical exfoliation ***,stable wavelength-tunable passive Q-switching pulse operation was obtained in a Yb-doped fiber ring cavity based on the Sb2Te3 SA,where the central wavelength can be continuously tuned from 1040.89 to 1092.85 *** suggest that Sb2Te3 has wideband saturable absorption properties,and that the tunable pulse laser can provide a convenient and simple source for practical applications.

关键词： Topological insulator Sb2Te3 Fiber laser Passive Q-switching laser Wavelength-tunable laser

Highly twisted M-line of a vortex beam due to the coupling of ultrahigh-order modes

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Chinese Optics Letters 2021年第7期19卷 38-42页

作者： Cheng Yin xuefen kan Kun Guo Tao Wang Jiangming Xu Qingbang Han Jian Wu Zhuangqi Cao College of Internet of Things Engineering Hohai UniversityChangzhou 2130022China College of Advanced Interdisciplinary Studies National University of Defense TechnologyChangsha 410073China Department of Physics and Astronomy Shanghai Jiao Tong UniversityShanghai 200240China

In modern optics, particular interest is devoted to the phase singularities that yield complicated and twisted phase structures by photons carrying optical angular *** this paper, the traditional M-line method is applied to a vortex beam(VB) by a symmetric metal cladding waveguide chip, which can host numerous oscillating guided modes via free space *** ultrahigh-order modes(UOMs) result in high angular resolution due to the high finesse of the resonant *** show that the reflected pattern of a VB can be divided into a series of inner and outer rings, whilst both of them are highly distorted by the M-lines due to the UOMs’ *** the distribution of the energy flux into account, a simple ray-optics-based model is proposed to simulate the reflected pattern by calculating the local incident angle over the cross section of the *** theoretical simulations fit well with the experimental results, and the proposed scheme may enable new applications in imaging and sensing of complicated phase structures.

关键词： vortex beam M-line method planar waveguide

基于双折射MIM结构的增强光自旋霍尔效应研究

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江西师范大学学报（自然科学版） 2018年第1期42卷 52-56页

作者：殷澄王贤平阚雪芬戴海浪李建韩庆邦河海大学物联网工程学院江苏常州213022 上海交通大学物理与天文学院上海210094 江西师范大学物理与通信电子学院江西南昌330022

光自旋霍尔效应所产生的横向IF(Imbert-Fedorov)位移一般仅为亚波长量级,因此极大地限制了该效应在精密度量领域的应用.该文提出一种金属/双折射材料/金属(MIM)的多层结构,通过直接耦合方式激发该结构中的振荡模式,并利用双折射特性形... 详细信息

光自旋霍尔效应所产生的横向IF(Imbert-Fedorov)位移一般仅为亚波长量级,因此极大地限制了该效应在精密度量领域的应用.该文提出一种金属/双折射材料/金属(MIM)的多层结构,通过直接耦合方式激发该结构中的振荡模式,并利用双折射特性形成偏振相关的小角度共振,以此来增强光自旋霍尔效应.理论分析表明:上述设想可将可见光波段的横向IF位移增强到可以直接观察的亚毫米甚至毫米量级.

关键词：光自旋霍尔效应 MIM结构横向IF位移

Surface lattice resonance of circular nano-array integrated on optical fiber tips

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Chinese Physics B 2023年第12期32卷 299-304页

作者：吴坚叶高杰庞修洋阚雪芬陆炎史健俞强殷澄王贤平 College of Advanced Interdisciplinary Studies Nanhu Laser LaboratoryHunan Provincial Key Laboratory of High Energy Laser TechnologyNational University of Defense TechnologyChangsha 410073China College of Internet of Things Engineering Hohai UniversityChangzhou 213022China School of Transportation Engineering Jiangsu Shipping CollegeNantong 226010China Jiangxi Key Laboratory of Photoelectronics and Telecommunication College of Physics and Communication ElectronicsJiangxi Normal UniversityNanchang 330022China i-Lab&Key Laboratory of Nanodevices and Applications&Key Laboratory of Nanophotonic Materials and Devices Suzhou Institute of Nano-Tech and Nano-BionicsChinese Academy of SciencesSuzhou 215123China

As metallic nanoparticles are arranged to form a 2D periodic nano-array,the coupling of the localized surface plasmonic resonance(LSPR)results in the well-known phenomenon of surface lattice resonances(SLRs).We theoretically investigate the SLR effect of the circular nano-array fabricated on the fiber *** difference between the 2D periodic and circular periodic arrays results in different resonant *** both structures,the resonant peaks due to the SLRs shift continuously as the array structures are *** some specific arrangements,the circular nano-array may generate a single sharp resonant peak with extremely high enhancement,which originates from the collective coupling of the whole *** interestingly,the spatial pattern of the vector near-field corresponding to the sharp peak is independent of the polarization state of the incidence,facilitating its excitation and *** finding may be helpful for designing multifunctional all-fiber devices.

关键词： fiber tip lattice resonance metallic nanoparticles vector field