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Dynamical Control of Broadband Coherent Absorption in ENZ Films

Journal Article · · Micromachines
DOI:https://doi.org/10.3390/mi11010110· OSTI ID:1803152
 [1];  [2];  [3];  [4];  [4];  [5];  [5];  [6]
  1. Univ. of Glasgow, Scotland (United Kingdom). School of Physics and Astronomy; OSTI
  2. Imperial College, London (United Kingdom). Dept. of Physics. The Blackett Lab.
  3. Purdue Univ., West Lafayette, IN (United States). Purdue Quantum Science and Engineering Institute; Purdue Univ., West Lafayette, IN (United States). Birck Nanotechnology Center. School of Electrical and Computer Engineering
  4. Heriot-Watt Univ., Edinburgh, Scotland (United Kingdom). Inst. of Photonics and Quantum Sciences
  5. Purdue Univ., West Lafayette, IN (United States). Purdue Quantum Science and Engineering Institute; Purdue Univ., West Lafayette, IN (United States). Birck Nanotechnology Center. School of Electrical and Computer Engineering
  6. Univ. of Glasgow, Scotland (United Kingdom). School of Physics and Astronomy
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.
Research Organization:
Purdue Univ., West Lafayette, IN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
SC0017717
OSTI ID:
1803152
Journal Information:
Micromachines, Journal Name: Micromachines Journal Issue: 1 Vol. 11; ISSN 2072-666X
Publisher:
MDPICopyright Statement
Country of Publication:
United States
Language:
English

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