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A bidirectional tunable optical diode based on periodically poled LiNbO3.

Qin Wang¹, Fei Xu, Zi-yan Yu

¹National Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210093, China.

|April 15, 2010

Summary

We developed a tunable optical diode using periodically poled lithium niobate (PPLN) that controls light direction with acoustic waves. This device offers adjustable optical isolation, enabling optional directionality for light propagation.

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Area of Science:

Photonics
Nonlinear Optics
Acousto-Optics

Background:

Optical diodes are crucial for integrated photonic circuits, enabling unidirectional light flow.
Periodically poled lithium niobate (PPLN) is a key material for nonlinear optical applications.
Controlling light propagation direction dynamically remains a significant challenge in photonics.

Purpose of the Study:

To propose and demonstrate a novel bidirectional tunable optical diode.
To investigate the use of acoustic waves for controlling optical diode properties.
To achieve direction-optional operation in a PPLN-based optical diode.

Main Methods:

Utilizing a defect-engineered periodically poled lithium niobate (PPLN) structure.
Inducing collinear photon-phonon interaction via propagating acoustic waves.

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Analyzing the nonlinear optical processes affected by the photon-phonon interaction.

Main Results:

The fundamental wave demonstrated an optical diode effect, allowing unidirectional light travel.
Acoustic wave modulation adjusted the optical isolation contrast from -1 to 1.
Direction-optional operation of the optical diode was successfully realized.

Conclusions:

A tunable optical diode based on PPLN with defect and acoustic wave interaction is feasible.
The proposed device offers adjustable optical isolation and direction-optional functionality.
This technology presents advantages for advanced photonic device applications.