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arXiv:1504.03491

Optically Induced Transparency in a Micro-cavity

Yuanlin Zheng, Jianfan Yang, Zhenhua Shen, Jianjun Cao, Xianfeng Chen, Xiaogan Liang, Wenjie Wan

Published Apr 14, 2015• 0 citations
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Abstract

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.

DOI
10.48550/arxiv.1504.03491

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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.
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.
Light-matter-light interactions serve as the backbone technology of all-optical information processing for both on-chip and long-haul communication purposes. The representative example of electromagnetically induced transparency has its unique ability of optically controlling transparency windows with relative low light in atomic systems, though its practical applications are limited due to rigid experimental requirements. Here we demonstrate a new form of optically induced transparency in a micro-cavity by introducing four-wave mixing gain in order to couple nonlinearly two separated resonances of the micro-cavity in ambient environment. A signature Fano-like resonance is also observed owing to the nonlinear interference of two coupled resonances. Moreover, we show that the unidirectional gain of four-wave mixing can lead to non-reciprocal transmission at the transparency windows. Optically induced transparency may offer a unique platform for a compact, integrated solution to all-optical processing and quantum information.
We report on the observation of optically induced transparency (OIT) in a compact microresonator in an ambient environment by introducing a four-wave mixing gain to nonlinearly couple two separated resonances of the micro-cavity. Its optical-controlling capacity and non-reciprocity characteristics at the transparency windows are also demonstrated. Active-controlling of the OIT can be achieved by varying a strong pump beam, while a small frequency-detuning of the pump can lead to a Fano-like asymmetric resonance justifying the interference nature of OIT. Furthermore, OIT observed here is a non-reciprocal one, since FWM gain is a unidirectional one owing to the conservation law of momentum.
The phenomena of induced transparency, with the typical examples of electromagnetically induced transparency (EIT) in atomic media and those based on coupled optical resonators, have attracted tremendous interest since their discoveries. Owing to the limitations of the involved physical elements, however, near-100\% transmissions were reported under highly demanding experimental conditions. With a structure of three linearly coupled optical resonators, an active one carrying optical gain and two passive ones simply with dissipation, we demonstrate that a transmitted light field can become completely transparent through the structure, which displays all properties similar to those of EIT. It is due to a destructive interference mechanism that totally eliminates the intracavity field in the dissipative resonator directly coupled to the transmitted field of any feasible power, when the coupling strength of two other resonators is tuned across a point determined by their associated gain and loss rates. This mechanism works for all possible coupling strengths of the dark resonator with the input field and its neighboring resonator, as well as for any available quality factor from its fabrication. The transparency window size and output field intensity can be freely adjusted by tuning two inter-cavity couplings of wide ranges, without modifying the built-in optical gain which can be just slightly stronger than the dissipation of the active resonator.