Broadband reflectionless metasheets: Frequency-selective transmission and perfect absorption

TL;DR

This paper presents a novel thin metasheet design that achieves broadband reflectionless absorption and frequency-selective transmission by using resonant modes in chiral unit cells, both theoretically and experimentally.

Contribution

It introduces a new approach to create broadband reflectionless absorbers using resonant electric and magnetic responses in chiral metasheets, expanding control over transmitted and absorbed electromagnetic waves.

Findings

Demonstrated broadband reflectionless absorption experimentally.

Achieved narrowband perfect absorption with wideband reflection suppression.

Proposed design applicable across the electromagnetic spectrum.

Abstract

Energy of propagating electromagnetic waves can be fully absorbed in a thin lossy layer, but only in a narrow frequency band, as follows from the causality principle. On the other hand, it appears that there are no fundamental limitations on broadband matching of thin absorbing layers. However, known thin absorbers produce significant reflections outside of the resonant absorption band. In this paper we explore possibilities to realize a thin absorbing layer which produces no reflected waves in a very wide frequency range, while the transmission coefficient has a narrow peak of full absorption. Here we show, both theoretically and experimentally, that a wide-band-matched thin resonant absorber, invisible in reflection, can be realized if one and the same resonant mode of the absorbing array unit cells is utilized to create both electric and magnetic responses. We test this concept using chiral particles in each unit cells, arranged in a periodic planar racemic array, utilizing chirality coupling in each unit cell but compensating the field coupling at the macroscopic level. We prove that the concept and the proposed realization approach also can be used to create non-reflecting layers for full control of transmitted fields. Our results can have a broad range of potential applications over the entire electromagnetic spectrum including, for example, perfect ultra-compact wave filters and selective multi-frequency sensors.