TY  - JOUR
AB  - © 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement. 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.
AU  - Schmidt, MK
AU  - Poulton, CG
AU  - Mashanovich, GZ
AU  - Reed, GT
AU  - Eggleton, BJ
AU  - Steel, MJ
DA  - 2019/01/01
DO  - 10.1364/OE.27.004976
EP  - 4989
JO  - Optics Express
PY  - 2019/01/01
SP  - 4976
TI  - Suspended mid-infrared waveguides for stimulated brillouin scattering
VL  - 27
Y1  - 2019/01/01
Y2  - 2026/06/09
ER  -