Cylindrical vector beam-excited frequency-tunable second harmonic generation in a plasmonic octamer  

作　　者：FAJUN XIAO WUYUN SHANG WEIREN ZHU LEI HAN MALIN PREMARATNE TING MEI JIANLIN ZHAO 

机构地区：[1]MOE Key Laboratory of Material Physics and Chemistry under Extraordinary Conditions,and Shaanxi Key Laboratory of Optical Information Technology,School of Science,Northwestern Polytechnical University,Xi'an 710129,China [2]Department of Electronic Engineering,Shanghai Jiao Tong University,Shanghai 200240,China [3]Advanced Computing and Simulation Laboratory(AχL),Department of Electrical and Computer Systems Monash University,Clayton,VlC 3800,Australia

出　　处：《Photonics Research》2018年第3期157-161,共5页光子学研究（英文版）

基　　金：National Key R&D Program of China(2017YFA0303800);National Natural Science Foundation of China(NSFC)(11634010,51777168,61377035,61675170,61675171,61701303);Australian Research Council(ARC)(DP140100883);Natural Science Basic Research Plan in Shaanxi Province,China(2017JM6022);Fundamental Research Funds for the Central Universities,China(3102017zy017);Natural Science Foundation of Shanghai,China(17ZR1414300);Shanghai Pujiang Program,China(17PJ1404100)

摘　　要：We report a method to tune the second harmonic generation(SHG) frequency of a metallic octamer by employing cylindrical vector beams as the excitation. Our method exploits the ability to spatially match the polarization state of excitations with the fundamental target plasmonic modes, enabling flexible control of the SHG resonant frequency.It is found that SHG of the octamer is enhanced over a broad band(400 nm) by changing the excitation from the linearly polarized Gaussian beam to radially and azimuthally polarized beams. More strikingly, when subjected to an azimuthally polarized beam, the SHG intensity of the octamer becomes 30 times stronger than that for the linearly polarized beam even in the presence of Fano resonance.We report a method to tune the second harmonic generation （SHG） frequency of a metallic octamer by employing cylindrical vector beams as the excitation. Our method exploits the ability to spatially match the polarization state of excitations with the fundamental target plasmonic modes, enabling flexible control of the SHG resonant frequency. It is found that SHG of the octamer is enhanced over a broad band （400 nm） by changing the excitation from the linearly polarized Gaussian beam to radially and azimuthally polarized beams. More strikingly, when subjected to an azimuthally polarized beam, the SHG intensity of the octamer becomes 30 times stronger than that for the linearly polarized beam even in the presence of Fano resonance.

关 键 词：SHG Cylindrical vector beam-excited frequency-tunable second harmonic generation in a plasmonic octamer 

分 类 号：TN[电子电信]