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High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

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Photorefractive flip-flop.

D Z Anderson, C Benkert, B Chorbajian

|September 24, 2009

Summary

This summary is machine-generated.

Researchers created an optical flip-flop using two coupled ring resonators in a barium titanate crystal. This device exhibits bistability and can be switched using an injected optical signal.

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Area of Science:

Nonlinear optics
Optical devices
Photorefractive materials

Background:

Optical flip-flops are essential for optical memory and signal processing.
Coupled resonator systems offer unique nonlinear optical phenomena.

Purpose of the Study:

To demonstrate a novel optical flip-flop device.
To investigate bistability in coupled ring resonators using photorefractive nonlinearity.

Main Methods:

Utilized two unidirectional ring resonators coupled via two-beam interactions.
Employed a photorefractive barium titanate (BaTiO3) crystal for active loss modulation.
Analyzed flip-flop bistability based on gain and loss parameters.

Main Results:

Achieved optical flip-flop behavior in the coupled resonator system.
Demonstrated that bistability occurs when net gain exceeds unity but is less than small-signal active loss.
Showcased the ability to switch the system's state with an injected optical signal.

Conclusions:

The proposed optical flip-flop based on coupled photorefractive resonators is feasible.
The system's bistability is controllable via gain-loss dynamics and external signals.
This work contributes to the development of advanced optical switching and memory elements.