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

IF 1.1 4区物理与天体物理 Q4 OPTICS Optical Review Pub Date : 2023-07-12 DOI:10.1007/s10043-023-00827-7

Xiaoman Luo, Jinhua Li, Yuan Ma, Youqiao Ma

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Abstract

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 λ?=?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.

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l型等离子波导与纳米天线高效耦合结构设计

本文提出了一种由l形介质负载表面等离子激元波导和l形纳米天线组成的高效耦合结构，并对其进行了数值研究。利用时域有限差分(FDTD)方法对耦合特性进行理论分析。详细研究了结构参数和入射光源等因素对自由空间光耦合效率的影响。仿真结果表明，当入射光在λ = 532 nm处垂直于DLSPPs波导偏振时，经几何参数优化后的结构的耦合性能比单直DLSPPs波导的耦合性能提高了至少3倍。该结构结构简单，易于制作，不仅可以实现亚波长模式约束，而且具有较高的耦合效率，因此在纳米光子耦合电路和纳米光学操作中具有潜在的应用前景。

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来源期刊

Optical Review 物理-光学

CiteScore

2.30

自引率

0.00%

发文量

审稿时长

2 months

期刊介绍： Optical Review is an international journal published by the Optical Society of Japan. The scope of the journal is: General and physical optics; Quantum optics and spectroscopy; Information optics; Photonics and optoelectronics; Biomedical photonics and biological optics; Lasers; Nonlinear optics; Optical systems and technologies; Optical materials and manufacturing technologies; Vision; Infrared and short wavelength optics; Cross-disciplinary areas such as environmental, energy, food, agriculture and space technologies; Other optical methods and applications.