Controllable optical bistability with perfect photon absorption

TL;DR

This paper introduces a method to control nonlinear coherent perfect absorption and optical bistability in a three-level atom-cavity system, enabling simultaneous CPA at the same frequency and tunable bistable regions for optical switching.

Contribution

It demonstrates a scheme to achieve controllable bistable CPA at the same frequency using a coherent control field in a three-level atom-cavity system, advancing optical switching technology.

Findings

Achieved simultaneous CPA at the same frequency with a control field.

Demonstrated tunable bistable regions with high output-input ratio.

Potential applications in optical switching and logic devices.

Abstract

We propose a scheme for controlling nonlinear coherent perfect absorption (CPA) in a three-level \Lambda-type atom-cavity system. Generally, the normally nonlinear CPA and the bistable CPA can be attained at the different frequencies of an input probe field. With a coherent control field coupling one of the ground states and the excited state of the atoms, two types of CPA can be attained at the same frequency. Besides, for the bistable CPA, the highest output-input ratio of the high stable state and the low stable state is approximately 1, and the bistable region is controllable with the control field. The controllable bistable CPA may have potential applications in optical bistable switching and optical logic devices