The whispering gallery modes of the microdisk laser is theoretically analyzed to determine the spontaneous emission coupling factor which affects the threshold current of the laser. The conformal transformation and the Wentzel-Kramers-Brillouin (WKB) approximation were used to calculate the modes. The conformal transformation is used to show the radial index distribution that provides a guiding action to confine the mode to near the edge of the disk. The spontaneous emission coupling factor is evaluated by considering the thickness and radius of the disk. A smaller value for the spontaneous emission coupling factor of the microdisk laser is achieved because of the weaker mode confinement in the structure.
ASJC Scopus subject areas
- Physics and Astronomy(all)
- Physics and Astronomy (miscellaneous)