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Volume 12
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10.3390/photonics12111135
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This is an early access version, the complete PDF, HTML, and XML versions will be available soon.
Article

Coherent Perfect Absorption in a Parametric Cavity- Ensemble System

by
Zi-Wei Li
,
Yan-Xue Cheng
,
Ying-Xia Wu
,
Jiaojiao Chen
* and
Wei Xiong
*
Department of Physics, Wenzhou University, Wenzhou 325035, China
*
Authors to whom correspondence should be addressed.
Photonics 2025, 12(11), 1135; https://doi.org/10.3390/photonics12111135
Submission received: 18 October 2025 / Revised: 12 November 2025 / Accepted: 13 November 2025 / Published: 17 November 2025
(This article belongs to the Special Issue Quantum Optics: Communication, Sensing, Computing, and Simulation)
Versions Notes

Abstract

We propose a scheme to achieve CPA not only in the strong-coupling regime but also in the weak-coupling regime. The system under consideration consists of an atomic ensemble coupled to an optical cavity containing an optical parametric amplifier (OPA). We show that when the OPA introduces an effective loss, CPA can occur only in the strong-coupling regime. In contrast, when the OPA provides an effective gain, CPA can emerge in both the weak- and strong-coupling regimes. We further demonstrate that in the weak-coupling regime, CPA cannot occur within the bistable region, whereas in the strong-coupling regime, CPA can indeed appear in the bistable region. Moreover, the output intensity can be flexibly controlled by tuning the effective strength and the phase of the OPA. Our work opens a potential way to design a coherent perfect absorber based on weak coupling mechanism.
Keywords: coherent perfect absorption; cavity QED; strong coupling; weak coupling; bistability coherent perfect absorption; cavity QED; strong coupling; weak coupling; bistability

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MDPI and ACS Style

Li, Z.-W.; Cheng, Y.-X.; Wu, Y.-X.; Chen, J.; Xiong, W. Coherent Perfect Absorption in a Parametric Cavity- Ensemble System. Photonics 2025, 12, 1135. https://doi.org/10.3390/photonics12111135

AMA Style

Li Z-W, Cheng Y-X, Wu Y-X, Chen J, Xiong W. Coherent Perfect Absorption in a Parametric Cavity- Ensemble System. Photonics. 2025; 12(11):1135. https://doi.org/10.3390/photonics12111135

Chicago/Turabian Style

Li, Zi-Wei, Yan-Xue Cheng, Ying-Xia Wu, Jiaojiao Chen, and Wei Xiong. 2025. "Coherent Perfect Absorption in a Parametric Cavity- Ensemble System" Photonics 12, no. 11: 1135. https://doi.org/10.3390/photonics12111135

APA Style

Li, Z.-W., Cheng, Y.-X., Wu, Y.-X., Chen, J., & Xiong, W. (2025). Coherent Perfect Absorption in a Parametric Cavity- Ensemble System. Photonics, 12(11), 1135. https://doi.org/10.3390/photonics12111135

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