1 复旦大学物理学系,应用表面物理国家重点实验室,上海市超构表面光场调控重点实验室,上海 200433
2 复旦大学光科学与工程系上海超精密光学制造工程技术研究中心,上海 200433
从超构表面调控电磁波研究的发展历史出发,详细介绍了基于复合相位超构表面实现高效多功能调控圆偏振电磁波的原理、设计思路和实验模拟表征,对近期国内外在这一领域的研究进展进行简要的论述,着力以此引导相关研究性实验教学,并为相关领域研究人员提供指引。
超构表面 共振相位 传输相位 几何相位 复合相位 圆偏振光 多功能 光学学报
2024, 44(10): 1026008
1 中北大学仪器与电子学院,山西 太原 030051
2 中北大学信息与通信工程学院,山西 太原 030051
利用同轴结构实现纳米粒子光学捕获,研究不同偏振光对光势阱的影响,并通过优化结构参数实现圆偏振下的等离激元涡旋场模式。研究结果表明:该同轴结构在线偏振光750 nm处透射率最大,并且在入射光强为1 μW/μm2时势阱深度达到17;圆偏振光在同轴结构上方形成涡旋场,能量流势阱深度为8。所设计的同轴结构扩大了光场作用范围,优化了光梯度力作用方向,提高了捕获低浓度小尺度粒子的效率。该研究结果对于低浓度生物分子光学捕获具有一定的参考意义。
激光光学 表面等离激元 光学捕获 圆偏振光 涡旋状光场
强激光与粒子束
2023, 35(10): 103002
强激光与粒子束
2023, 35(10): 103003
运用经典系综方法研究了线偏振激光场和双色反旋圆偏振激光场中CO2分子非序列双电离的产量。结果表明:在激光强度较高的区域,双色反旋圆偏振激光场下CO2分子非序列双电离的产量高于线偏振激光场;在激光强度较低的区域,结果则刚好相反。这是因为当激光强度较低时,CO2非序列双电离产量的主要影响因素是抑制势垒,当激光强度较高时,由于抑制势垒发生扭曲,其产量主要受激光场结构的影响。
原子与分子物理学 非序列双电离 双色反旋圆偏振激光场 线偏振激光场 分子 产量 光学学报
2023, 43(20): 2002001
Author Affiliations
Abstract
1 Huazhong University of Science and Technology, Wuhan National Laboratory for Optoelectronics and School of Optical and Electronic Information, Wuhan, China
2 Optics Valley Laboratory, Wuhan, China
3 Boston University, Boston, Massachusetts, United States
Diverse spatial mode bases can be exploited in mode-division multiplexing (MDM) to sustain the capacity growth in fiber-optic communications, such as linearly polarized (LP) modes, vector modes, LP orbital angular momentum (LP-OAM) modes, and circularly polarized OAM (CP-OAM) modes. Nevertheless, which kind of mode bases is more appropriate to be utilized in fiber still remains unclear. Here, we aim to find the superior mode basis in MDM fiber-optic communications via a system-level comparison in air-core fiber (ACF). We first investigate the walk-off effect of four spatial mode bases over 1-km ACF, where LP and LP-OAM modes show intrinsic mode walk-off, while it is negligible for vector and CP-OAM modes. We then study the mode coupling effect of degenerate vector and CP-OAM modes over 1-km ACF under fiber perturbations, where degenerate even and odd vector modes suffer severe mode cross talk, while negligible for high-order degenerate CP-OAM modes based on the laws of angular momentum conservation. Moreover, we comprehensively evaluate the system-level performance for data-carrying single-channel and two-channel MDM transmission with different spatial mode bases under various kinds of fiber perturbations (bending, twisting, pressing, winding, and out-of-plane moving). The obtained results indicate that the CP-OAM mode basis shows superiority compared to other mode bases in MDM fiber-optic communications without using multiple-input multiple-output digital signal processing. Our findings may pave the way for robust short-reach MDM optical interconnects for data centers and high-performance computing.
fiber-optic communications mode-division multiplexing spatial modes linearly polarized modes vector modes linearly polarized orbital angular momentum modes circularly polarized orbital angular momentum modes air-core fiber fiber perturbations Advanced Photonics
2023, 5(5): 056003
南京航空航天大学电子信息工程学院, 江苏 南京 211106
提出了一种采用基片集成同轴线 (SICL)馈电的双馈点圆极化微带贴片天线。具体通过多馈点法实现圆极化, 并通过背腔加载提高增益, 增加带宽, 减小后瓣, 降低互耦, 提高天线性能。经过仿真验证, 该天线能够在 42.42~56.69 GHz之间实现 S11 <-10 dB(相对带宽为 28.8%@ 51 GHz), 在 45.26~48.08 GHz之间实现轴比小于 3 dB, 最大增益 8.9 dBi。
圆极化 多馈点法 基片集成同轴线 贴片天线 circularly polarized dual-feed method Substrate Integrated Coaxial Line(SICL) patch antenna 太赫兹科学与电子信息学报
2023, 21(3): 349