Dr. Tianhua Feng Profile

Dr. Tianhua Feng

at Jinan Univ

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Proceedings Article | 13 December 2024 Paper

Metasurfaces for nonlinear Brillouin light scattering

Pengteng Li, Jin Yuan, Tianhua Feng

Proceedings Volume 13500, 1350008 (2024) https://doi.org/10.1117/12.3047108

KEYWORDS: Light scattering, Chalcogenides, Scattering, Acoustic waves, Waveguides, Silicon, Thin films, Nanowires, Chalcogenide glass, Signal processing

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Brillouin scattering provides a unique approach in diverse applications ranging from sensing to signal processing and beyond. The recent advancement in Brillouin scattering research has been driven by the development of integrated photonic platforms. However, the realization of efficient Brillouin scattering with substantial gains at low pump powers within compact devices is still a challenge. We propose and demonstrate a chalcogenide metasurface as a promising candidate for facilitating spontaneous Brillouin scattering. By employing GeSbS materials with remarkable photoelastic properties and leveraging the capacity of metasurfaces to effectively confine light waves through quasi-bound states in the continuum, alongside their ability to confine acoustic waves via mechanical resonances, a substantial Brillouin gain of up to 21 dB is achieved at a low pump power of 9.12 mW within a metasurface of compact dimensions less than 0.03 cm. The superior performance of chalcogenide metasurfaces-based Brillouin scattering may hold profound potential to advance Brillouin scattering research and find wide applications.

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