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Coherent Perfect Absorption of Arbitrary Wavefronts at an Exceptional Point
Helmut Hörner1, Lena Wild1, Yevgeny Slobodkin2
1Institute for Theoretical Physics, <a href="https://ror.org/04d836q62">TU Wien</a>, Wiedner Hauptstraße 8-10/136, A-1040 Vienna, Austria.
Physical Review Letters
|November 12, 2024
Summary
Researchers developed a new cavity design for broadband exceptional-point absorption, overcoming limitations of previous coherent perfect absorbers. This advancement enables efficient energy deposition from light fields with arbitrary wavefronts.
Area of Science:
- Optics and Photonics
- Quantum Optics
- Materials Science
Background:
- Coherent perfect absorbers (CPAs) utilize light's interferometric properties for complete energy deposition into samples.
- Traditional CPAs are sensitive to spectral and spatial detuning, limiting their practical application.
- Recent advancements include exceptional-point physics and degenerate cavities to overcome CPA limitations.
Purpose of the Study:
- To combine exceptional-point physics and degenerate cavities into a novel cavity design.
- To achieve broadband exceptional-point absorption for arbitrary wavefronts.
- To present and validate two implementations of this new absorber design.
Main Methods:
- Theoretical modeling based on exceptional-point physics.
- Design of a massively degenerate exceptional-point absorber.
- Numerical simulations to validate analytical predictions.
- Comparison of analytical results with numerical simulations.
Main Results:
- Demonstration of a cavity design enabling broadband exceptional-point absorption.
- The new design overcomes spectral and spatial detuning sensitivities.
- Successful validation of two distinct implementations through simulations.
- Achieved absorption of arbitrary wavefronts.
Conclusions:
- The combined approach offers a robust solution for efficient light energy harvesting.
- This work paves the way for advanced optical devices with enhanced absorption capabilities.
- The developed absorber is suitable for broadband applications and complex light fields.
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