Efficient planar plasmonic directional launching of linearly polarized light in a catenary metasurface

Physical Chemistry Chemical Physics : PCCP
Panpan ChenJianping Shi

Abstract

Efficient directional excitation of planar surface plasmon polaritons (SPPs) has important and wide applications in micro-nano photonic technology. Recently, by using the geometric phase and spin-orbit interaction, catenary structures have been applied to the directional control of SPPs and showed excellent performance. However, due to the need to use the chirality of the subwavelength catenary apertures, the previously studied systems were only suitable for circularly polarized light. Here, based on a catenary metasurface we theoretically design and experimentally demonstrate a SPP directional launcher used for linearly polarized light. The numerical calculation results show that the directional extinction ratio reaches up to 35 dB under the normal incidence of p-polarized light at 750 nm which is 5 dB higher than the maximum extinction ratio in the existing results as we know. The experimental results show that the resonant wavelength position, bandwidth and extinction ratio change trend well match the theoretical results. The physical mechanism is analyzed and it is found that the asymmetric quadrupole mode is the key factor leading to the directional SPPs which is completely different from the geometric phase modulation mec...Continue Reading

References

Aug 15, 2003·Nature·William L BarnesThomas W Ebbesen
Jan 5, 2011·ACS Nano·Oscar Vazquez-MenaJuergen Brugger
Jun 4, 2013·Scientific Reports·Huimin LiaoQihuang Gong
Jan 24, 2014·Nature Materials·Nanfang Yu, Federico Capasso
Feb 5, 2016·Scientific Reports·Xiong LiXiangang Luo
Jun 16, 2017·Light, Science & Applications·Xian-Gang LuoXiao-Liang Ma
Jun 23, 2020·Light, Science & Applications·Liangui DengShuang Zhang
Jun 13, 2021·Light, Science & Applications·Liangui DengShuang Zhang

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BETA
biosensors
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