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Nonlinear optical switch based on coherent perfect absorption.
Optics Letters
|August 1, 2023
Summary
We demonstrate a novel optical switch utilizing coherent perfect absorption (CPA) and coherent perfect reflection (CPR). This switch can convert between CPA and CPR states using an incoherent field, achieving high switching efficiency.
Area of Science:
- Optics and Photonics
- Quantum Optics
- Materials Science
Background:
- Coherent perfect absorption (CPA) and coherent perfect reflection (CPR) enable precise control of optical fields.
- Typically, CPA and CPR require specific input-field phase relationships.
Purpose of the Study:
- To propose a scheme for a bistable optical switch with convertible CPA and/or CPR functionalities.
- To investigate the control mechanism and operational regimes of the proposed switch.
Main Methods:
- Utilizing an incoherent field to switch between CPA and CPR states, even when input probe beams are in phase.
- Analyzing the switch's operation in both linear (weak input) and nonlinear/bistable (strong input) regimes.
Main Results:
- Demonstrated conversion between CPA and CPR states using an incoherent switching field.
- Achieved theoretically a maximum switching efficiency of η=1.
- Showcased operation in linear and nonlinear regimes, with efficiency sensitive to input-field intensity.
Conclusions:
- The proposed scheme offers a novel method for bistable optical switching with high efficiency.
- The intensity-dependent efficiency suggests potential applications in sensitive optical detection.
