Improvement of thermal nonlinear effect in hybrid microsphere resonator

A novel hybrid resonator structure is fabricated by coating low refractive index ultraviolet glue to the surface of microsphere resonator. By analyzing the thermal optical coefficient in such structure, the thermal nonlinear effect is demonstrated theoretically and experimentally and the experimental results show that a larger thermal nonlinear coefficient can be achieved. Simultaneously, it is verified that quality factor has influenced the thermal nonlinear coefficient. This work presents that the hybrid resonator structure could be used to improve the thermal nonlinear effect for applications in thermal sensors and the sensitivity can be increased at 2.8 times.