I study a multilayered medium consisting of a metal–dielectric composite film, a spacer layer, and a dielectric Bragg reflector. I demonstrate a greater flexibility over the critical coupling phenomenon [ Tischler et al., Opt. Lett. 31, 2045 (2006) ], whereby nearly all the incident light energy is absorbed by the composite film through suppression of both transmission and reflection from the structure. For a larger volume fraction of the metal inclusions, strong light–matter coupling is shown to lead to almost total absorption at two distinct frequencies.
© 2007 Optical Society of America
Original Manuscript: November 17, 2006
Revised Manuscript: March 14, 2007
Manuscript Accepted: March 19, 2007
Published: May 3, 2007
S. Dutta Gupta, "Strong-interaction—mediated critical coupling at two distinct frequencies," Opt. Lett. 32, 1483-1485 (2007)