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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

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

Single-cell detection by enhancement of fluorescence in waveguides for cancer diagnosis and therapy

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Photonics Research 2021年第12期9卷 2381-2387页

作者： HAILANG DAI HONGRUI SHAN ZHANGCHI SUN DAOPENG DAI YUXI SHANG zhuangqi cao XIANFENG CHEN State Key Laboratory of Advanced Optical Communication Systems and Networks School of Physics and AstronomyShanghai Jiao Tong UniversityShanghai 200240China Zhejiang Rongjun Hospital Jiaxing 314000China School of Pharmacy Shanghai Jiao Tong UniversityShanghai 200240China Department of Cardiology Ruijin HospitalShanghai Jiao Tong University School of MedicineShanghai 200240China Collaborative Innovation Centre of Light Manipulations and Applications Shandong Normal UniversityJinan 250358China

Cancer is one of the most common diseases to threaten human *** individuals are diagnosed with malignant tumors via a single cell,medical workers are greatly advantageous to early diagnose and intervene in malignant tumors *** this paper,we propose a fluorescence detection map to rapidly distinguish whether the chromosomes of a cell are normal or abnormal by detecting the fluorescent intensity of a single ***,we draw a map from a single cell with an abnormal number of chromosomes that is monitored in real ***,this way offers precise and prompt detection of the surviving of cancer cells at or near the site of the tumor after treatments for cancer,which can achieve personalized cancer diagnosis and ***,cancer recurrences and metastasis can be effectively identified,utilizing this ultrasensitive detection method of an abnormal chromosome number.

关键词： diagnosis utilizing prompt

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空芯金属包覆波导传感器特性及应用领域分析

江西师范大学学报（自然科学版） 2016年第2期40卷 111-115页

作者：曹庄琪上海交通大学物理与天文系上海200240

不同于一般的光波导,空芯金属包覆波导中超高阶导模的有效折射率可处于0 详细信息

不同于一般的光波导,空芯金属包覆波导中超高阶导模的有效折射率可处于0

关键词：空芯金属包覆波导超高阶导模自由空间耦合技术高功率密度高品质因子高灵敏度

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任意形状光栅皱阶光波导的分布反馈耦合系数

光子学报 1999年第4期28卷 295-301页

作者：周骏曹庄琪南开大学光学信息科学开放实验室上海交通大学应用物理系光学与光子学研究所

根据转移矩阵理论，在弱周期结构近似下获得了任意形状光栅皱阶光波导的ＴＥ模分布反馈耦合系数的计算公式，同时给出了几种典型的周期型皱阶光波导耦合系数的简洁解析表达式。

关键词：光栅皱阶光波导转移矩阵理论耦合系数光栅

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一种分辨力达纳弧度量级的角位移传感新方法

光学学报 2007年第4期27卷 673-679页

作者：舒建伟曹庄琪沈启舜陈凡上海交通大学物理系导波光电子器件实验室上海200240

提出了一种测量微小角位移的新方法,该法基于一种金属包覆波导结构,通过棱镜耦合激发空气导波层中的超高阶导模作为灵敏探针。当被测部件发生微小偏转时,空气层厚度和导模的有效折射率也因此改变,从而引起耦合光束的反射光强急剧变动,... 详细信息

提出了一种测量微小角位移的新方法,该法基于一种金属包覆波导结构,通过棱镜耦合激发空气导波层中的超高阶导模作为灵敏探针。当被测部件发生微小偏转时,空气层厚度和导模的有效折射率也因此改变,从而引起耦合光束的反射光强急剧变动,其变动幅度与部件的角位移量近似成正比关系。对传感的灵敏度进行了数值分析,结果表明导模的有效折射率是影响灵敏度的重要参量。采用一种类似悬臂梁的结构产生可控微小角位移,并以此对平均灵敏度进行了测算,得到的结果与理论预测值符合得较好(相对误差约为3%)。理论和实验结果表明,只要部件的偏转半径达到厘米量级,就可以实现分辨力达10-9rad数量级的角位移传感。

关键词：光学测量角位移传感金属包覆波导超高阶导模

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

基于单通道反射型电光调制器实现不同路光同时调制的方法

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光学学报 2006年第12期26卷 1777-1780页

作者：杨艳芳印杰曹庄琪沈启舜上海交通大学化学化工学院上海200240 上海交通大学物理系上海200240

提出了一种利用单通道反射型聚合物电光调制器同时调制不同路光的方法。衰减全反射结构的电光调制器,其每一个衰减全反射(ATR)峰的位置分别对应于一个导波共振模式。实验系统中利用衰减全反射导膜峰作为调制通道,使其每一路光路的入射... 详细信息

提出了一种利用单通道反射型聚合物电光调制器同时调制不同路光的方法。衰减全反射结构的电光调制器,其每一个衰减全反射(ATR)峰的位置分别对应于一个导波共振模式。实验系统中利用衰减全反射导膜峰作为调制通道,使其每一路光路的入射角分别对应于不同导波共振模式的工作角,就可以实现利用单通道的电光调制器同时调制不同路光。提出了三种实现两路光同时调制的模式,并给出了三种模式的调制结果。结果表明,作为调制通道的导模阶数越低,调制效率越高。在832 nm光波波长下,采用最低阶导模进行调制时可以获得42.9%的调制效率。

关键词：集成光学器件电光调制器导模衰减全反射