Study of two-dimensional photonic crystal microcavities filled with polymer

We present numerical study of microcavity biosensor in photonic crystal (PC) with triangular lattice of air holes patterned perpendicularly to an InP-based confining heterostructure. The microcavity is formed by varying the radius of one air hole. The 2D finite difference time domain (FDTD) method algorithm (fullwave simulator) is used to compute the light transmission efficiency and the quality factor (Q) when the refractive index (RI) filled in the air holes of water and polymer. The detected spectrum has a Lorentzian line shape, and the peak occurs when the PC cavity is at resonance. The resonance wavelength of this cavity will shift accordingly due to the variation of RI. The polymer filling of photonic crystal holes can be used to measure gas, fluids, biolayers, or bound chemical.