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Self-pulsing in prism coupling into planar waveguides.

V Briguet, P Pirani, W Lukosz

|September 11, 2009

Summary

Researchers observed self-pulsing and bistability in silicon dioxide-titanium dioxide (SiO2-TiO2) waveguides using argon laser light. System dynamics depend on thermal expansion and water molecule desorption, affecting light coupling and waveguide properties.

Area of Science:

Nonlinear optics
Materials science
Waveguide optics

Background:

Optical waveguides are crucial for integrated photonics.
Understanding nonlinear optical phenomena in waveguides is essential for device development.
Silicon dioxide-titanium dioxide (SiO2-TiO2) composites offer tunable optical properties.

Purpose of the Study:

Investigate the dynamic optical behavior of absorbing SiO2-TiO2 waveguides.
Analyze the influence of input parameters on self-pulsing and bistability.
Elucidate the underlying physical mechanisms governing the observed phenomena.

Main Methods:

Coupling argon laser light into SiO2-TiO2 waveguides.
Varying the angle of incidence and initial gap width.

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Monitoring output power and observing dynamic responses.

Main Results:

Observed self-pulsing, bistability, and unique bistable states with constant or self-pulsing output.
Demonstrated dependence of system dynamics on angle of incidence and gap width.
Identified thermal expansion and H2O desorption as key governing effects.

Conclusions:

The dynamic optical behavior of SiO2-TiO2 waveguides is complex and controllable.
Thermal expansion and H2O desorption significantly impact waveguide light coupling and effective index.
These findings are relevant for designing advanced optical waveguide devices.