Abstract
A racetrack resonator with a high value () is demonstrated experimentally based on small SU-8 optical ridge waveguides, which were fabricated with an improved etchless process. Optical bistability is observed in the present racetrack resonator even with a low input optical power (5.6–7.3 mW), which is attributed to the significant thermal nonlinear optical effect due to the high value and the large negative thermo-optical coefficient of SU-8. Theoretical modeling for the optical bistability is also given, and it agrees well with the experimental result.
© 2013 Optical Society of America
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