Gas-sensor based on photonic crystal to identify carbon dioxide

In this srticle, a pillar-based photonic crystal (PhC) gas-sensor is presented. The gas-sensor is formed by using the ring resonator nanocavity. The PhC structure is consisted of pillars on dielectric slab waveguides of InP/InGaAsP/InP layers in hexagonal lattice. The radius and the lattice constant of pillars are equal to 145.6nm and 520nm, respectively, by optimizing the bandgap at a wavelength of 1.55m. The calculation results show that a change in pillars refractive index of about 0.000222 by using the carbon dioxide gas instead of air will shift the centre wavelength of nanocavity about 0.54nm.

کلیدواژه ها:

gas sensor ، photonic crystal ، InP materials