We derive the quasi-orthogonality condition of optical modes in a dispersive and inhomogeneous medium. This condition leads to the proper normalization rule of the optical field in a general linear medium with inhomogeneity. The derived rule also provides a physically meaningful method in estimating the magnitude of the field-enhanced spontaneous and stimulated emission rates, for example, in a microcavity or nanocavity.
© 2008 Optical Society of America
Original Manuscript: September 26, 2008
Manuscript Accepted: November 15, 2008
Published: December 29, 2008
Shu-Wei Chang and Shun Lien Chuang, "Normal modes for plasmonic nanolasers with dispersive and inhomogeneous media," Opt. Lett. 34, 91-93 (2009)