Abstract:Transfer matrix theory is used to study the influence of adsorption on mirror symmetry one-dimensional photonic crystals′ transmission spectrum.The results show that the change of absorption coefficient k in dielectric layers obviously affects the transmission spectrum of photonic crystals,in which the absorption of layer B has the strongest influence on the transmission spectra.It shows that when there is no absorption in dielectric layers,the transmission peak with transmission rate of 100% appears in the main band.With the increasing of coefficient k in dielectric layer B,the peak transmission rate in the main transmission band decreases rapidly.When k=0.001,the rate of transmission peaks tends to 0,and the transmission rate of the pass band on both sides tends to be incomplete band.When absorption exists in layers A,B and C,the transmission rate of transmission peak and both sides of the pass band decline sharply.When k=0.0006,the transmission rate of the peak tends to 0,and both sides of the pass band is gradually weakened.These features have some reference values on the design of new optical device.