Dynamical control of broadband coherent absorption in ENZ films

Bruno, V., Vezzoli, S., DeVault, C., Roger, T., Ferrera, M., Boltasseva, A., Shalaev, V. M. and Faccio, D. (2020) Dynamical control of broadband coherent absorption in ENZ films. Micromachines, 11(1), 110. (doi: 10.3390/mi11010110)

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Abstract

Interferometric effects between two counter-propagating beams incident on an optical system can lead to a coherent modulation of the absorption of the total electromagnetic radiation with 100% efficiency even in deeply subwavelength structures. Coherent perfect absorption (CPA) rises from a resonant solution of the scattering matrix and often requires engineered optical properties. For instance, thin film CPA benefits from complex nanostructures with suitable resonance, albeit at a loss of operational bandwidth. In this work, we theoretically and experimentally demonstrate a broadband CPA based on light-with-light modulation in epsilon-near-zero (ENZ) subwavelength films. We show that unpatterned ENZ films with different thicknesses exhibit broadband CPA with a near-unity maximum value located at the ENZ wavelength. By using Kerr optical nonlinearities, we dynamically tune the visibility and peak wavelength of the total energy modulation. Our results based on homogeneous thick ENZ media open a route towards on-chip devices that require efficient light absorption and dynamical tunability.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Bruno, Mr Vincenzo and Faccio, Professor Daniele and Vezzoli, Dr Stefano
Authors: Bruno, V., Vezzoli, S., DeVault, C., Roger, T., Ferrera, M., Boltasseva, A., Shalaev, V. M., and Faccio, D.
College/School:College of Science and Engineering > School of Physics and Astronomy
Journal Name:Micromachines
Publisher:MDPI
ISSN:2072-666X
ISSN (Online):2072-666X
Copyright Holders:Copyright © 2020 The Authors
First Published:First published in Micromachines 11(1):110
Publisher Policy:Reproduced under a Creative Commons License

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Project CodeAward NoProject NamePrincipal InvestigatorFunder's NameFunder RefLead Dept
303022The Physics and Technology of Photonic Metadevices and MetasystemsDaniele FaccioEngineering and Physical Sciences Research Council (EPSRC)Ref:515132 EP/M009122/2P&S - Physics & Astronomy