Effect of multiphoton absorption and free carriers in slow-light photonic crystal waveguides

Chad Husko, Pierre Colman, Sylvain Combrié, Alfredo De Rossi, Chee Wei Wong

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

We examine the effects of multiphoton absorption, free carriers, and disorder-induced linear scattering in slow-light photonic crystal waveguides. We derive an analytic formulation for self-phase modulation including the group velocity scaling of the nonlinear phase shift in materials limited by three-photon absorption as a representative nonlinear process. We investigate the role of free carriers and derive an approximate critical intensity at which these effects begin to strongly modify the optical field. This critical intensity is employed to determine an optimal group index for the self-phase modulation in the slow-light devices. These observations are confirmed with numerical modeling.
Original languageEnglish
JournalOptics Letters
Volume36
Issue number12
Pages (from-to)2239-2241
ISSN0146-9592
DOIs
Publication statusPublished - 2011
Externally publishedYes

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