Critical coupling in a system of two coupled negative index medium layers

TL;DR

This paper investigates critical coupling in a system of two coupled negative index medium layers, demonstrating near-total suppression of reflection and transmission at specific frequencies and showing tunability by changing the incidence angle.

Contribution

It introduces a method to achieve and tune critical coupling in coupled negative index media layers while maintaining causality.

Findings

Near-total suppression of reflection and transmission at critical coupling.

Tunable CC frequency by varying the angle of incidence.

Full causal response preserved in the NIM materials.

Abstract

We study critical coupling (CC) in a system of two coupled negative index medium (NIM) layers leading to near-total suppression of both reflection and transmission at specified frequencies. The tunability of the CC frequency is demonstrated by varying the angle of incidence retaining the full causal response for the NIM materials.