Year: 2025
Type: article
Abstract: Aluminum nitride (AlN), a wide‐bandgap III–V material, offers excellent transparency in the optical communication band and a favorable refractive index for strong optical confinement, making it a promising platform in stimulated Brillouin scattering (SBS). Here, we observe, for the first time, optically excited SBS in suspended AlN‐on‐silicon waveguides. A Brillouin gain coefficient of 91.8 m −1 W −1 is achieved at an acoustic frequency of 2.32 GHz, with a linewidth of 10.1 MHz. The Brillouin nonlinear response can be tailored by varying the waveguide dimensions. Furthermore, the Bragg grating–based Fabry–Pérot (FP) resonator enhances the gain coefficient to 150.37 m −1 W −1 and results in a narrowed linewidth of 9.87 MHz. These results not only validate the feasibility of strong intrinsic Brillouin interaction in suspended AlN waveguides but also pave the new way for CMOS‐compatible on‐chip Brillouin amplifiers, lasers, and isolators.
Source: Nanophotonics
Authors: Han Xue, Chukun Huang, Haotian Shi, Jiaheng Fu, Tianheng Zhang, Junqiang Sun
Language: English
Topic: Photonic and Optical Devices
Subfield: Electrical and Electronic Engineering
Field: Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $2,995
Awards: G6002742255, G8422727905
OpenAlex ID: W4416716934