Local density of optical states calculated by the mode spectrum in stratified media


 The local density of optical states (LDOS) is an important physical concept, which can characterize the spontaneous emission of microcavities. In order to calculate the LDOS, the relationship between the mode spectrum and the LDOS is established. Then, based on the transfer matrix method and the effective resonator model, the leaky loss of the leaky mode and the mode spectrum in the one-dimensional photonic bandgap crystal waveguide are calculated, results of which indicate that the mode spectrum can characterize the leaky loss of the leaky mode. At last, the density of optical states (DOS), and the LDOS in each layer are calculated. The partial DOS and the partial LDOS in the quantum well, related to the fundamental leaky mode, can be used to find out the optimal location of the quantum well in the defect layer to couple more useful photons into the lasing mode for lasers.