TY - UNPB
T1 - Stimulated Brillouin scattering in a non-suspended ultra-low-loss thick-SOI platform
AU - Ye, Kaixuan
AU - Keloth, Akshay
AU - Marin, Yisbel E.
AU - Cherchi, Matteo
AU - Aalto, Timo
AU - Marpaung, David
PY - 2024/10/24
Y1 - 2024/10/24
N2 - Silicon photonics, with its CMOS compatibility and high integration density, has enabled a wide range of novel applications. Harnessing stimulated Brillouin scattering (SBS), an optomechanic interaction between optical and GHz acoustic waves, in silicon-on-insulator (SOI) platforms attracts great interests for its potential in narrow-linewidth lasers and microwave photonics. However, the poor optoacoustic overlap in silicon nanowires on conventional SOI platforms has previously restricted the observation of SBS signals to suspended silicon waveguide structures. In this work, we report, for the first time, the SBS response in a non-suspended ultra-low-loss thick-SOI waveguide platform. The SBS process in this 3~$\mu$m thick SOI platform is enabled by a leaky acoustic mode that coexists with the optical mode in the waveguide core, resulting in enhanced optoacoustic overlap. We measured a Brillouin gain coefficient of 2.5 m$^{-1}$W$^{-1}$ and 1.9 m$^{-1}$W$^{-1}$ at 37.6 GHz for the rib and strip waveguide, respectively. This work paves the way for Brillouin-based applications in non-suspended ultra-low-loss silicon photonics systems.
AB - Silicon photonics, with its CMOS compatibility and high integration density, has enabled a wide range of novel applications. Harnessing stimulated Brillouin scattering (SBS), an optomechanic interaction between optical and GHz acoustic waves, in silicon-on-insulator (SOI) platforms attracts great interests for its potential in narrow-linewidth lasers and microwave photonics. However, the poor optoacoustic overlap in silicon nanowires on conventional SOI platforms has previously restricted the observation of SBS signals to suspended silicon waveguide structures. In this work, we report, for the first time, the SBS response in a non-suspended ultra-low-loss thick-SOI waveguide platform. The SBS process in this 3~$\mu$m thick SOI platform is enabled by a leaky acoustic mode that coexists with the optical mode in the waveguide core, resulting in enhanced optoacoustic overlap. We measured a Brillouin gain coefficient of 2.5 m$^{-1}$W$^{-1}$ and 1.9 m$^{-1}$W$^{-1}$ at 37.6 GHz for the rib and strip waveguide, respectively. This work paves the way for Brillouin-based applications in non-suspended ultra-low-loss silicon photonics systems.
KW - physics.optics
U2 - 10.48550/arXiv.2410.19083
DO - 10.48550/arXiv.2410.19083
M3 - Preprint
BT - Stimulated Brillouin scattering in a non-suspended ultra-low-loss thick-SOI platform
PB - ArXiv.org
ER -