Rodriguez A, Priya P, Ortiz O, Senellart P, Gomez-Carbonell C, Lemaître A, Esmann M, Lanzillotti-Kimura N D
Opt Express. 2021 Jan 18;29(2):2637-2646. doi: 10.1364/OE.415228.
Brillouin spectroscopy emerges as a promising non-invasive tool for nanoscale imaging and sensing. One-dimensional semiconductor superlattice structures are eminently used for selectively enhancing the generation or detection of phonons at few GHz. While commercially available Brillouin spectrometers provide high-resolution spectra, they consist of complex experimental techniques and are not suitable for semiconductor cavities operating at a wide range of optical wavelengths. We develop a pragmatic experimental approach for conventional Brillouin spectroscopy that can integrate a widely tunable excitation-source. Our setup combines a fibered-based angular filtering and a spectral filtering based on a rotating single etalon and a double grating spectrometer for sequential reconstruction of Brillouin spectra. This configuration allows probing confined acoustic phonon modes in the 20-300 GHz frequency range with excellent laser rejection and high spectral resolution. Remarkably, our scheme based on the excitation and collection of the enhanced Brillouin scattering signals through the optical cavity allows for better angular filtering with decreasing phonon frequency. It can be implemented for the study of cavity optomechanics and stimulated Brillouin scattering over broadband optical and acoustic frequency ranges.
布里渊光谱作为一种用于纳米级成像和传感的有前景的非侵入性工具而出现。一维半导体超晶格结构被广泛用于选择性增强几吉赫兹声子的产生或检测。虽然市售的布里渊光谱仪能提供高分辨率光谱，但它们采用复杂的实验技术，不适用于在宽光学波长范围内工作的半导体腔。我们为传统布里渊光谱开发了一种实用的实验方法，该方法可以集成一个宽可调谐激发源。我们的装置结合了基于光纤的角度滤波以及基于旋转单标准具和双光栅光谱仪的光谱滤波，用于布里渊光谱的顺序重建。这种配置允许在20 - 300吉赫兹频率范围内探测受限声子模式，具有出色的激光抑制和高光谱分辨率。值得注意的是，我们基于通过光学腔激发和收集增强布里渊散射信号的方案，随着声子频率降低能实现更好的角度滤波。它可用于在宽带光学和声学频率范围内研究腔光力学和受激布里渊散射。
