Polarization-switchable plasmonic emitters based on laser-induced bubbles  

作　　者：Jianjun Chen Fengyuan Gan 

机构地区：[1]Department of Physics and Applied Optics Beijing Area Major Laboratory,Beijing Normal University,Beijing 100875,China [2]State Key Laboratory for Mesoscopic Physics,School of Physics,Peking University,Beijing 100871,China [3]Peking University Yangtze Delta Institute of Optoelectronics,Nantong 226010,China [4]Frontiers Science Center for Nano-optoelectronics&Collaborative Innovation Center of Quantum Matter,Peking University,Beijing 100871,China [5]Collaborative Innovation Center of Extreme Optics,Shanxi University,Taiyuan 030006,China

出　　处：《Opto-Electronic Advances》2022年第8期11-20,共10页光电进展（英文）

基　　金：supported by the National Key Research and Development Program of China(2018YFA0704401);the Beijing Natural Science Foundation(Z180015);the National Natural Science Foundation of China(61922002 and 91850103).

摘　　要：Owing to weak light-matter interactions in natural materials,it is difficult to dynamically tune and switch emission polariza-tion states of plasmonic emitters(or antennas)at nanometer scales.Here,by using a control laser beam to induce a bubble(n=1.0)in water(n=1.333)to obtain a large index variation as high as|Δn|=0.333,the emission polarization of an ultra-small plasmonic emitter(~0.4λ^(2))is experimentally switched at nanometer scales.The plasmonic emitter consists of two orthogonal subwavelength metallic nanogroove antennas on a metal surface,and the separation of the two anten-nas is only s_(x)=120 nm.The emission polarization state of the plasmonic emitter is related to the phase difference between the emission light from the two antennas.Because of a large refractive index variation(|Δn|=0.333),the phase difference is greatly changed when a microbubble emerges in water under a low-intensity control laser.As a result,the emission polarization of the ultra-small plasmonic emitter is dynamically switched from an elliptical polarization state to a linear polarization state,and the change of the degree of linear polarization is as high asΔγ≈0.66.

关 键 词：plasmonic emitters nanometer scales polarization manipulation dynamical switching BUBBLES 

分 类 号：O53[理学—等离子体物理]