Optically Induced Transparency in Two Cavity System

Gongtao Yu, Guixia Pan

Abstract We investigate a hybrid multi-cavity optomechanical system with interference from a two-level atomic ensemble. The system is composed of three optical cavities and two nanomechanical resonators. A two-level atomic ensemble is filled into the middle optical cavity. The optical cavity located in the middle has two interaction forces with the two outermost optical cavities. What is more, the system also includes various types of interaction relations, which are the couplings of optical cavities with mechanical resonators and the coupling of optical cavity with two-level atomic ensemble. In order to study the optical response of optomechanically induced transparency, we modulate the interaction intensity within the system to obtain different eletromagnetic induced transparent phenomena. It has been found that under the influence of different parameters, the number of transparent windows and the width of transparent windows increase with an increase in the coupling of the optical cavities with atomic ensemble. In addition, as the system parameters change, the transparency points also move. The position of the two outermost transparent points becomes farther apart when the coupling of optical cavity with mechanical resonators increases. Our approach provides a great flexibility for controlling electromagnetically induced transparency. It will have the great potential applications for quantum information processing.

Tracy M.W.Y. Li

Akhtar Munir, Gao Xianlong, Muqaddar Abbas +1 more

Abstract We aim to study the properties of the output probe field (OPF) in a system composed of two coupled-optical cavities. A strong pump and a weak probe field drives the left cavity whereas the right-side cavity is coupled to mechanical oscillation via photothermal effect. The two cavities are coupled with optical coupling strength J . Single photothermally induced transparency (PTIT) in a single cavity is realized via thermal effect (2020, Sci. Adv. 6 , eaax8256). Following the idea, we report double PTIT in coupled-cavities system. The control of single to double PTIT is realized in the proposed system by properly adjusting the coupling strength J . We further show the enhancement of slow light by adjusting the coupling strength ( J ) between the cavities. Our proposed scheme facilitates experiments to investigate photothermal effects in an array of optomechanical systems.

Ralf Röhlsberger, Hans‐Christian Wille, Kai Schlage +1 more

Perry R. Rice, Robert J. Brecha

Yuanlin Zheng, Jianfan Yang, Zhenhua Shen +4 more

Electromagnetically induced transparency has the unique ability to optically control transparency windows with low light in atomic systems. However, its practical applications in quantum physics and information science are limited due to rigid experimental requirements. Here we demonstrate a new mechanism of optically induced transparency in a micro-cavity by introducing a four-wave mixing gain to nonlinearly couple two separated resonances of the micro-cavity in an ambient environment. A signature Fano-like resonance was observed owing to the nonlinear interference of the two coupled resonances. Moreover, we show that the unidirectional gain of the four-wave mixing can lead to the remarkable effect of non-reciprocal transmission at the transparency windows. Optically induced transparency may offer a unique platform for a compact, integrated solution to all-optical and quantum information. Scientists have used light to make a micro-cavity transparent to light, which may lead to compact components for all-optical processing. Since its discovery in 1991, the phenomenon of electromagnetically induced transparency in atomic systems has generated much excitement due to its potential for all-optical and quantum information processing. But it is hard to incorporate in chips because it generally uses atoms in the gaseous phase. Now, Wenjie Wan at Shanghai Jiao Tong University in China and co-workers in China and the United States have realized the equivalent effect—optically induced transparency (OIT) —in a micro-cavity by using a nonlinear optical effect known as four-wave mixing. The researchers anticipate that OIT may offer a new avenue for compact all-optical and quantum information processing.