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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
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Photosensitive chalcogenide metasurfaces supporting bound states in the continuum
Optics Express
|December 28, 2019
Summary
We demonstrate tunable metasurfaces with sharp Fano-resonances using light-sensitive chalcogenide glass. Post-fabrication tuning of optical properties is achieved by controlling resonance spectral position with light exposure.
Area of Science:
- Photonics and optical engineering
- Materials science
- Condensed matter physics
Background:
- Metasurfaces offer unique light-manipulating capabilities.
- Fano-resonances are crucial for sharp spectral features.
- Optical bound states in the continuum (BICs) provide a route to high-Q resonances.
Purpose of the Study:
- To theoretically and experimentally investigate tunable metasurfaces supporting sharp Fano-resonances.
- To explore the use of photosensitive arsenic trisulfide glass for post-fabrication tuning.
- To demonstrate control over the resonance spectral position using light absorption.
Main Methods:
- Theoretical modeling of metasurfaces with Fano-resonances.
- Experimental fabrication of metasurfaces using arsenic trisulfide.
- Post-fabrication optical tuning via controlled light exposure.
- Spectroscopic analysis of resonance spectral position.
Main Results:
- Achieved sharp Fano-resonances in metasurfaces.
- Demonstrated light-induced tuning of optical properties in arsenic trisulfide.
- Successfully controlled the resonance spectral position by adjusting light exposure energy and intensity.
- Resonant wavelength selected below the bandgap, tuned by light above the bandgap.
Conclusions:
- Tunable metasurfaces with Fano-resonances are achievable using photosensitive materials.
- Light-induced modification of optical properties offers a viable post-fabrication tuning method.
- This approach enables precise control over optical response for advanced photonic applications.
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