Dependence of optical microcavities coupled with temperature in one-dimensional photonic crystals

In this work, by the transfer matrix method we calculated the transmittance spectrum of two defects coupled in a one-dimensional photonic crystal composed of alternating layers of Bi4Ge3O12 and SiO2 with defects of SiO2. We consider the simultaneous effects of thermal and thermal-optical expansion. It was found the presence of two defect modes within the photonic band gap, where the position of the modes changes to long wavelengths when increasing the temperature. Additionally, as we increase the separation of defects and temperature, the confinement of the modes is greater with a shift of the central wavelength.