Design of efficient coupling configuration with L-shaped plasmoic waveguide and nanoantenna

被引：1
作者：
Luo, Xiaoman [1 ]
Li, Jinhua [1 ]
Ma, Yuan [2 ]
Ma, Youqiao [1 ,3 ]
机构：
[1] Nanjing Univ Informat Sci & Technol, Sch Phys & Optoelect Engn, Nanjing 210044, Peoples R China
[2] Dalhousie Univ, Dept Elect & Comp Engn, Halifax, NS B3J 2X4, Canada
[3] Nanjing Univ Informat Sci & Technol, Jiangsu Key Lab Optoelect Detect Atmosphere & Ocea, Nanjing 210044, Peoples R China
来源：
OPTICAL REVIEW | 2023年 / 30卷 / 04期
基金：
中国国家自然科学基金;
关键词：
Surface plasmon; DLSPPs waveguide; Coupling; Directional coupler; REFRACTIVE-INDEX; SURFACE-PLASMONS; POLARITONS; RESONANCE; GRAPHENE;
D O I：
10.1007/s10043-023-00827-7
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
A novel design for an efficient coupling configuration, which consists of a L-shaped dielectric loaded surface plasmon polaritons (DLSPPs) waveguide and L-shaped nanoantenna, is proposed and investigated numerically in this paper. We carried out the theoretical analysis for the coupling characteristics by utilizing the finite-difference time-domain (FDTD) method. The factors affecting the coupling efficiency of light from free space to the proposed structure were studied in detail, including the structural parameters and incident light source. The simulation results reveal that the coupling performance of proposed structure with optimized geometric parameters is at least three times enhanced compared to that of a single straight DLSPPs waveguide when the incident light is polarized perpendicular to DLSPPs waveguide at a wavelength of & lambda; = 532 nm. The proposed configuration, which is simple and easy to fabricate, can not only achieve the subwavelength mode confinement but also possesses a relatively high coupling efficiency, thus may potentially be used in nano-photonic coupling circuits and nano-optical manipulation.
引用
收藏
页码：462 / 468
页数：7
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