Abstract

Label-free photonic biological sensors and environmental monitors can perform sensitive and quantitative multi-parameter measurements, where a crucial component is a transducer that can transform an environmental refractive index variation to a measurable optical transmission change. By using optical whispering gallery mode (WGM) resonators with high quality factor that have narrow resonance valleys, the smallest detectable spectra shift can be minimized, which are beneficial for the improvement of the detection limit. In order to increase the device sensitivity, suspended structures are developed. To the best of our knowledge, a T-shape suspended racetrack ring resonator has not been demonstrated.

© 2015 Japan Society of Applied Physics, Optical Society of America