Designing a novel photonic crystal nano-ring resonator for biosensor application

Abstract In this paper, a biosensor is designed and optimized based on photonic crystal nanoring resonator. The ring resonator is formed by two consecutive curves and is sandwiched by two waveguides. For analyzing this biosensor, two-dimensional finite-difference timedomain method and plane-wave expansion approach are applied. Sensing mechanism of the biosensor is based on the intensity variation scheme. When the sensing hole has different refractive indices, output transmission spectrum is shifted. Intensity variations occurred at the wavelength of 1,482.7 nm. The results show that in this biosensor for a unit change in the refractive index, intensity of the transmission spectrum is reduced by 14.26 units.

Photonic crystal · Nano-ring resonator · Biosensor · Intensity variation · Transmission spectrum