Ring resonator-based highly sensitive chemical/biochemical sensor created on holes in silicon slab 2D photonic crystal

2D photonic crystal ring resonator (2DPCRR)-based highly sensitive chemical/biochemical sensor is designed and simulated. It consists of triangular lattice air holes on a silicon slab of refractive index 3.46 . The sensitivity is determined by shifts in the resonance wavelength as a function of the refractive index of sensing holes. Simulations are performed using the two-dimension finite-difference time-domain method, and the band diagram is calculated using the plane wave expansion method. The 2DPCRR has ultra-compact footprint of 75 μ m 2 , high-quality factor of 3105.58 , with a spectral width of 0.5 nm at the resonant wavelength of 1552.79 nm . Sensor shows a high figure of merit ( 862 RIU - 1 ) , a low detection limit ( 1.2 ∗ 10 - 4 RIU ) , and a maximum sensitivity of 431 nm / RIU . The proposed sensor exhibits considerable performance enhancements in comparison with previously published results.