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Radiation-pressure-induced mechano-optical bistability.

|September 3, 2009

Summary

Researchers demonstrate a novel mechano-optical bistability. Radiation pressure from a laser beam creates a feedback loop, causing a waveguide pendulum to resonate, offering new possibilities in optical device control.

Area of Science:

Optomechanics
Nonlinear Optics
Quantum Optics

Background:

Optical systems can exhibit bistability, where two stable states exist.
Radiation pressure, the force exerted by light, can influence mechanical systems.

Purpose of the Study:

To propose and analyze a new form of radiation-pressure-induced bistability.
To investigate the mechano-optical feedback mechanism in a waveguide system.

Main Methods:

A planar waveguide was suspended as a torsional pendulum.
A laser beam was coupled into the waveguide via a grating coupler.
The angular resonance of incoupling efficiency was analyzed.

Main Results:

A feedback loop was established where radiation pressure torque drives the pendulum towards resonance.

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The incoupling efficiency's dependence on the pendulum's angular position was identified as key.

This feedback mechanism results in observable mechano-optical bistability.

Conclusions:

The study successfully demonstrates a novel radiation-pressure-induced mechano-optical bistability.
This phenomenon arises from the interplay between optical incoupling efficiency and mechanical feedback.
The findings open avenues for new tunable optical components and sensors.