Directional Chiral Optical Emission by Electron-Beam-Excited Nano-Antenna  

作　　者：熊翔 曾昭源 彭茹雯 王牧 Xiang Xiong;Zhao-Yuan Zeng;Ruwen Peng;Mu Wang(National Laboratory of Solid State Microstructures,School of Physics,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China;American Physical Society,100 Motor Parkway,Hauppauge,New York 11778,USA)

机构地区：[1]National Laboratory of Solid State Microstructures,School of Physics,and Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China [2]American Physical Society,100 Motor Parkway,Hauppauge,New York 11778,USA

出　　处：《Chinese Physics Letters》2023年第1期71-75,共5页中国物理快报（英文版）

基　　金：supported by the National Key R&D Program of China(Grant No.2020YFA0211300);the National Natural Science Foundation of China(Grant Nos.11974177,61975078,and 12234010)。

摘　　要：Manipulating directional chiral optical emissions on a nanometer scale is significant for material science research. The electron-beam-excited nanoantenna provides a favorable platform to tune optical emissions at the deep subwavelength scale. Here we present an L-shaped electron-beam-excited nanoantenna(LENA) with two identical orthogonal arms. By selecting different electron-beam impacting sites on the LENA, either the lefthanded circularly polarized(LCP) or the right-handed circularly polarized(RCP) emission can be excited. The LCP and RCP emissions possess different emission directionality, and the emission wavelength depends on the arm length of the LENA. Further, we show a combined nanoantenna with two LENAs of different arm lengths.Induced by the electron beam, LCP and RCP lights emit simultaneously from the nanoantenna with different wavelengths to different directions. This approach is suggested to be informative for investigating electron-photon interaction and electron-beam spectroscopy in nanophotonics.

关 键 词：EXCITED directional POLARIZED 

分 类 号：TN820[电子电信—信息与通信工程]