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Coherent feedback induced transparency.

Bixuan Fan, Jiahui Ning, Min Xie

|September 29, 2020

Summary

This summary is machine-generated.

We demonstrate a novel light transparency effect using coherent feedback in a linear optical system. This method allows separate control of light transmission and group velocity, enabling unity transmission even with suppressed group velocity.

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Area of Science:

Quantum optics
Photonics
Nonlinear optics

Background:

Controlling light propagation is crucial in photonics.
Coherent feedback systems offer unique light manipulation possibilities.

Purpose of the Study:

To investigate a novel light transparency effect induced by coherent feedback.
To explore the control of group velocity and transmission rate in optical systems.

Main Methods:

Studying a linear optical cavity with a linear coherent feedback loop.
Utilizing unidirectional coupling for system and feedback control.
Applying phase shifts to the feedback signal.

Main Results:

Observed novel transparency behaviors in optical signal fields.
Demonstrated separate tuning of group velocity and transmission rate.
Achieved unity transmission rate even with significantly suppressed group velocity.
Induced perfect transmission via phase-shifted feedback.

Conclusions:

Coherent feedback provides a simple and effective method for light transmission control.
Linear optical elements can be used to independently manage light speed and transmission.
The proposed technique offers precise control over light propagation dynamics.