Suspended mid-infrared waveguides for stimulated brillouin scattering

M. K. Schmidt, C. G. Poulton, G. Z. Mashanovich, G. T. Reed, B. J. Eggleton, M. J. Steel

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


We theoretically investigate a new class of silicon waveguides for achieving Stimulated Brillouin Scattering (SBS) in the mid-infrared (MIR). The waveguide consists of a rectangular core supporting a low-loss optical mode, suspended in air by a series of transverse ribs. The ribs are patterned to form a finite quasi-one-dimensional phononic crystal, with the complete stopband suppressing the transverse leakage of acoustic waves, confining them to the core of the waveguide. We derive a theoretical formalism that can be used to compute the opto-acoustic interaction in such periodic structures, and find forward intramodal-SBS gains up to 1750 m -1 W -1 , which compares favorably with the proposed MIR SBS designs based on buried germanium waveguides. This large gain is achieved thanks to the nearly complete suppression of acoustic radiative losses.

Original languageEnglish
Pages (from-to)4976-4989
Number of pages14
JournalOptics Express
Issue number4
Publication statusPublished - 18 Feb 2019


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