A Plasmonic Infrared Multiple-Channel Filter Based on Gold Composite Nanocavities Metasurface.

Jialin Zhang,Shuang Liu,Xiaoxu Deng,Jiacheng Duan,Chongyang Shen,Weiji Yang,Xuanyi Yu,Jingxin Dong

doi:10.3390/nano11071824

Jialin Zhang, Shuang Liu + Show 6 more

Open Access

https://doi.org/10.3390/nano11071824

Copy DOI

Abstract

A plasmonic near-infrared multiple-channel filter is numerically and experimentally investigated based on a gold periodic composite nanocavities metasurface. By the interference among different excited plasmonic modes on the metasurface, the multipeak extraordinary optical transmission (EOT) phenomenon is induced and utilized to realize multiple-channel filtering. Investigated from the simulated transmission spectrum of the metasurface, the positions and intensity of transmission peaks are tuned by the geometrical parameters of the metasurface and environmental refractive index. The fabricated metasurface approached transmission peaks at 1128 nm, 1245 nm, and 1362 nm, functioning as a three-passbands filter. With advantages of brief single-layer fabrication and multi-frequency selectivity, the proposed plasmonic filter has potential possibilities of integration in nano-photonic switching, detecting and biological sensing systems.

Highlights

The transmission spectrum of the single-horizontal nanocavity metasurface, the double-vertical nanocavities metasurface, and the composite nanocavities metasurface are simulated by the finite-difference time-domain (FDTD) solution
At the 1132 nm transmission peak, the electric field is enhanced within the horizontal cavity, as shown in Figure 3a, which is induced by the excited surface plasmon polaritons (SPPs)
At transmission peak I, the electric field is enhanced within the horizontal cavity, shown in Figure 3c, which is directly motived by the basic mode before

Summary

Introduction

Plasmonic metamaterials based on metal nanocavities, exhibiting notable optical properties, including extraordinary optical transmission (EOT) [4], negative refractive index [5], and enhancement of nonlinear effect [6,7], has been an active research field in past decades, which provide great prospects of the application in sensing [8,9,10], plasmonic color filtering [11,12,13,14], and subdiffractive imaging [15], etc. A polarization-insensitive NIR filter is presently based on asymmetry metallic elliptical and circle nanocavities array metasurface [26], exhibiting 79 nm narrow linewidth generated by a Fano resonance.

Methods

Results

Conclusion