Investigation of thermal tunable nano metallic photonic crystal filter with mirror symmetry

Using the transfer matrix method, the effect of temperature on the transmission spectra of thermal tunable nano metallic photonic crystal filter has been investigated. Three different materials H (high refractive index material), L (low refractive index material) and M as a metallic layer, have been used to make this structure. M layer is considered to be Silver. The complex refractive index of Silver is a function of temperature and wavelength simultaneously so, the structure is tunable with temperature and incident angle. It is found that the transmission peaks shift by changing temperature and incident angle. At a given incident angle, they move toward higher wavelengths by increasing the temperature. The temperature dependence of transmission peaks is linear. At a constant temperature, they move toward the shorter wavelengths by increasing the incident angle. Also by increasing the temperature, due to dissipation the height of transmission peaks gets decreased and this reduction is linear too.