Plasmonic Bragg Reflectors for Subwavelength Hole Arrays in a Metal Film

TL;DR

This paper introduces plasmonic Bragg reflectors that significantly enhance optical transmission in subwavelength hole arrays by reducing edge losses, with potential applications in plasmonic integrated circuits.

Contribution

It demonstrates a novel design of plasmonic Bragg reflectors with half the periodicity to boost transmission in subwavelength hole arrays.

Findings

Double the transmission compared to arrays without reflectors

Reflectors prevent edge loss, enhancing overall transmission

Potential for device isolation in plasmonic circuits

Abstract

We present plasmonic Bragg reflectors for increasing the extraordinary optical transmission through periodic arrays of subwavelength apertures in a metal film. The increase in transmission arises by preventing loss at the edges of the array. The plasmonic Bragg reflectors have periodicity of half the usual array's periodicity. Nano-hole arrays flanked thus by reflectors exchibited double the transmission as compared to the arrays without reflectors. These structures may also be used to isolate devices in plasmonic integrated circuits.