Cylindrical vector beam-excited frequency-tunable second harmonic generation in a plasmonic octamer
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.
基金项目：National Key R&D Program of China (2017YFA0303800); National Natural Science Foundation of China (NSFC) 10.13039/501100001809 (11634010, 51777168, 61377035, 61675170, 61675171, 61701303); Australian Research Council (ARC)10.13039/501100000923 (DP140100883); Natural Science Basic Research Plan in Shaanxi Province, China (2017JM6022); Fundamental Research Funds for the Central Universities, China (3102017zy017); Natural Science Foundation of Shanghai10.13039/100007219, China (17ZR1414300); Shanghai Pujiang Program, China (17PJ1404100).
Wuyun Shang：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
Weiren Zhu：Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, ChinaAdvanced Computing and Simulation Laboratory (AχL), Department of Electrical and Computer Systems Engineering, Monash University, Clayton, VIC 3800, Australia
Lei Han：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
Malin Premaratne：Advanced Computing and Simulation Laboratory (AχL), Department of Electrical and Computer Systems Engineering, Monash University, Clayton, VIC 3800, Australia
Ting Mei：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
Jianlin Zhao：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, Chinae-mail: firstname.lastname@example.org
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Fajun Xiao, Wuyun Shang, Weiren Zhu, Lei Han, Malin Premaratne, Ting Mei, and Jianlin Zhao, "Cylindrical vector beam-excited frequency-tunable second harmonic generation in a plasmonic octamer," Photonics Research 6(3), 000157 (2018)