Optical Curtain Effect: Extraordinary Optical Transmission Enhanced by Antireflection

TL;DR

This paper demonstrates that an antireflective coating with inverted pi-shaped metallic grooves significantly enhances optical transmission through nanoslit arrays, achieving up to 90% efficiency and maintaining a stable optical curtain effect.

Contribution

Introduction of an antireflective coating design that boosts transmission efficiency and preserves the optical curtain effect in nanoslit systems, with potential applications in LED light extraction.

Findings

Achieved up to 90% total transmission efficiency.

Maintained spatially invariant field distribution in output.

Enhanced light extraction and beaming control in LEDs.

Abstract

In this paper, we employ an antireflective coating which comprises of inverted pi shaped metallic grooves to manipulate the behaviour of a TM-polarized plane wave transmitted through a periodic nanoslit array. At normal incidence, such scheme can not only retain the optical curtain effect in the output region, but also generate the extraordinary transmission of light through the nanoslits with the total transmission efficiency as high as 90%. Besides, we show that the spatially invariant field distribution in the output region as well as the field distribution of resonant modes around the inverted pi shaped grooves can be reproduced immaculately when the system is excited by an array of point sources beneath the inverted pi shaped grooves. In further, we investigate the influence of center-groove and side-corners of the inverted pi shaped grooves on suppressing the reflection of light, respectively. Based on our work, it shows promising potential in applications of enhancing the extraction efficiency as well as controlling the beaming pattern of light emitting diodes.