Anti-reflection coatings for Epsilon-Near-Zero materials

Posted on 21.09.2022 - 16:19
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 aim 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.


Wynne, Laura; Zhang, Cissy; Akpan, Usenobong; Di Falco, Andrea; Schulz, Sebastian (2022): Anti-reflection coatings for Epsilon-Near-Zero materials. Optica Publishing Group. Collection.
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Laura Wynne
Cissy Zhang
Usenobong Akpan
Andrea Di Falco
Sebastian Schulz
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