Refractometry using Large Index Contrast Narrow Width Micro-ring Resonator

Abstract

Exploiting the large field confinement of transverse magnetic mode in low refractive index region, we proposed and analyze refractometer using narrow width, high index contrast micro-ring resonator. For the waveguide width of 60 nm, a sensitivity of 610 nm/RIU is achieved with figure of merit 228.4 RIU−1 and limit of detection $4.4\times 10^{-3}$ in the range of 1.33-1.37 of refractive indices.