The field distribution inside a random waveguide has been measured over a spectral range in which the wave is nominally localized. In addition to spatially and spectrally isolated modes, extended field distributions known as necklace states are found inside random samples due to the spectral overlap. Necklace states are shown to be a superposition of multipeaked quasimodes. We performed numerical simulations that demonstrate the robustness of these spectra to variations in the random structure. We also used simulations to investigate the impact of dissipation on transmission and reflection spectra and upon the field distribution of quasimodes.
© 2007 Optical Society of America
Original Manuscript: April 17, 2007
Manuscript Accepted: May 11, 2007
Published: August 13, 2007
Photonic Metamaterials (2007) JOSA A
P. Sebbah, B. Hu, V. I. Kopp, and A. Z. Genack, "Effect of absorption on quasimodes of a random waveguide," J. Opt. Soc. Am. B 24, A77-A83 (2007)