AI Article Synopsis
- Interferometric effects between two opposing beams can create coherent modulation in how much electromagnetic radiation is absorbed, achieving 100% efficiency even in tiny structures.
- Coherent perfect absorption (CPA) typically relies on engineered optical properties, but this study presents a way to achieve broadband CPA using unpatterned epsilon-near-zero (ENZ) films.
- By utilizing Kerr optical nonlinearities, the research allows for dynamic tuning of the absorption properties, paving the way for efficient and adjustable on-chip devices.
Article 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.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7020079 | PMC |
| http://dx.doi.org/10.3390/mi11010110 | DOI Listing |
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