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Wideband coherent perfect absorber based on white-light cavity
Optics Letters
|December 10, 2014
Summary
We developed a broadband coherent perfect absorber (CPA) using white-light cavities, achieving wide-spectrum absorption. This overcomes the single-frequency limits of traditional CPAs for advanced optical applications.
Area of Science:
- Photonics and Optics
- Materials Science
Background:
- Conventional coherent perfect absorbers (CPAs) are limited to single-frequency operation.
- Broadband absorption is crucial for many advanced optical applications.
Purpose of the Study:
- To introduce a novel concept for a broadband coherent perfect absorber (CPA).
- To demonstrate wide-spectrum absorption overcoming the limitations of existing CPA technologies.
Main Methods:
- Utilizing the properties of white-light cavities for device design.
- Developing a closed-form analytic description of the CPA.
- Performing finite difference time-domain (FDTD) simulations for silicon-based devices.
Main Results:
- Achieved coherent absorption over a wide spectrum (40 nm).
- Demonstrated flat, wide-band power absorption in Si-based devices.
- Proposed novel integrated-optics-based pulse absorber/terminator and optical modulator.
Conclusions:
- The proposed white-light cavity CPA offers a viable solution for broadband coherent absorption.
- The technology enables new possibilities for optical signal processing and control.
