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Dynamical Control of Broadband Coherent Absorption in ENZ Films

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...

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Autores principales: Bruno, Vincenzo, Vezzoli, Stefano, DeVault, Clayton, Roger, Thomas, Ferrera, Marcello, Boltasseva, Alexandra, Shalaev, Vladimir M., Faccio, Daniele
Formato: Online Artículo Texto
Lenguaje:English
Publicado: MDPI 2020
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7020079/
https://www.ncbi.nlm.nih.gov/pubmed/31968578
http://dx.doi.org/10.3390/mi11010110
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author Bruno, Vincenzo
Vezzoli, Stefano
DeVault, Clayton
Roger, Thomas
Ferrera, Marcello
Boltasseva, Alexandra
Shalaev, Vladimir M.
Faccio, Daniele
author_facet Bruno, Vincenzo
Vezzoli, Stefano
DeVault, Clayton
Roger, Thomas
Ferrera, Marcello
Boltasseva, Alexandra
Shalaev, Vladimir M.
Faccio, Daniele
author_sort Bruno, Vincenzo
collection PubMed
description 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.
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spelling pubmed-70200792020-03-09 Dynamical Control of Broadband Coherent Absorption in ENZ Films Bruno, Vincenzo Vezzoli, Stefano DeVault, Clayton Roger, Thomas Ferrera, Marcello Boltasseva, Alexandra Shalaev, Vladimir M. Faccio, Daniele Micromachines (Basel) Article 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. MDPI 2020-01-20 /pmc/articles/PMC7020079/ /pubmed/31968578 http://dx.doi.org/10.3390/mi11010110 Text en © 2020 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).
spellingShingle Article
Bruno, Vincenzo
Vezzoli, Stefano
DeVault, Clayton
Roger, Thomas
Ferrera, Marcello
Boltasseva, Alexandra
Shalaev, Vladimir M.
Faccio, Daniele
Dynamical Control of Broadband Coherent Absorption in ENZ Films
title Dynamical Control of Broadband Coherent Absorption in ENZ Films
title_full Dynamical Control of Broadband Coherent Absorption in ENZ Films
title_fullStr Dynamical Control of Broadband Coherent Absorption in ENZ Films
title_full_unstemmed Dynamical Control of Broadband Coherent Absorption in ENZ Films
title_short Dynamical Control of Broadband Coherent Absorption in ENZ Films
title_sort dynamical control of broadband coherent absorption in enz films
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC7020079/
https://www.ncbi.nlm.nih.gov/pubmed/31968578
http://dx.doi.org/10.3390/mi11010110
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