光子学报
2022, 51(12): 1223001
红外与激光工程
2022, 51(2): 20220086
Author Affiliations
Abstract
1 School of Electronic and Optical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
2 The 28th Research Institute of China Electronics Technology Group Corporation, Nanjing 210007, China
3 College of Electronic and Optical Engineering & College of Microelectronics, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
4 Collaborative Innovation Center of Advanced Microstructures and School of Physics, Nanjing University, Nanjing 210093, China
Photonic nanojets (PNJs) are subwavelength jet-like propagating waves generated by illuminating a dielectric microstructure with an electromagnetic wave, conventionally a linearly polarized plane wave. Here, we study the donut-like PNJ produced when a circularly polarized vortex beam is used instead. This novel PNJ also has a reverse energy flow at the donut-like focal plane depending on both the optical vortex topological charge and microsphere size. Our tunable PNJ, which we investigate numerically and analytically, can find applications in optical micromanipulation and trapping.
photonic nanojet optical vortex reverse energy flow Chinese Optics Letters
2021, 19(10): 102602
北京大学纳米器件物理与化学教育部重点实验室, 北京 100871
受衍射极限的限制,传统光学显微镜的分辨率只能达到入射光波长的一半。超分辨显微镜已有很多,但制作工艺复杂,适用样品有限,对成像条件要求苛刻,因此应用受到很多限制。研究表明,将直径为几微米至几十微米的透明电介质微球置于样品表面,能显著提高传统光学显微镜的分辨能力,在白光下即可实现超分辨成像,与其他类型显微镜结合使用时也能保持超分辨能力。这种新型透镜为纳米结构和生物样本的实时超分辨成像提供了一种简单、直接的方式。结合本课题组研究结果,介绍并总结了国内外微球透镜的研究进展。
成像系统 超分辨成像 微球透镜 光子纳米喷射效应 生物成像 激光与光电子学进展
2016, 53(7): 070003