Anti-reflection coatings for epsilon-near-zero materials

Laura Wynne*, Cissy Zhang, Usenobong Benjamin Akpan, Andrea Di Falco, Sebastian Andreas Schulz

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Citations (Scopus)
3 Downloads (Pure)

Abstract

Epsilon-near-zero (ENZ) materials have attracted much interest within the photonics community due to the various novel light-matter interactions that can occur in the ENZ regime. These materials display a large impedance mismatch between the ENZ material and free space, making it difficult to couple light into the medium at normal incidence. In this article, we demonstrate that enhanced light coupling into an ENZ metamaterial stack can be achieved via the design and fabrication of anti-reflection coatings, which are simple to fabricate via e-beam evaporation. The coating fabricated has been optimized not only to minimize reflection but also aims to maximize transmission — making these designs applicable to e.g. beam shaping applications. We achieve a transmission enhancement of 20% through our metamaterial over a 150 nm range and reflection minimization of 50% over a 200 nm range.
Original languageEnglish
Pages (from-to)4088-4095
Number of pages8
JournalOptical Materials Express
Volume12
Issue number10
Early online date21 Sept 2022
DOIs
Publication statusPublished - 1 Oct 2022

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