Spurious signals identification in Brillouin light scattering spectrum

IF 2.4 3区 化学 Q2 SPECTROSCOPY Journal of Raman Spectroscopy Pub Date : 2024-05-24 DOI:10.1002/jrs.6702
Si-Min Pang, Yan-Pei Lv, Jun Zhang
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Abstract

Brillouin light scattering (BLS) is the inelastic scattering of light from elementary excitations with periodic density modulation. The characteristics of non-contact, high sensitivity, and high resolution in energy, wavevector, time, space, and phase make the BLS spectrometer widely used in investigating many intriguing physical phenomena, including the acoustic phonon confinement effects, Bose-Einstein condensation (BEC), supercurrent, and soliton formation. Generally, the quick and correct assignment of the signals in the BLS spectra is a prerequisite for further investigations. Herein, we experimentally identify the high-order spurious signals in the BLS spectra, which make the interpretation of the spectra difficult. The additional signals are demonstrated to originate from the laser and the temperature-controlled laser filter used for laser filtering. Our results would contribute to the rapid assignment of the signals from the sample after excluding the spurious signals reported here. Moreover, the series of high-order modes spaced by the free spectral range can serve as a weak broadband light source, which has great potential for investigating the optical responses of materials.

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识别布里渊光散射光谱中的杂散信号
布里渊光散射(BLS)是基本激元对光的非弹性散射,具有周期性密度调制。布里渊光散射具有非接触、高灵敏度以及在能量、波矢、时间、空间和相位方面的高分辨率等特点,因此被广泛应用于研究许多有趣的物理现象,包括声子约束效应、玻色-爱因斯坦凝聚(BEC)、超电流和孤子形成等。一般来说,快速、正确地分配 BLS 光谱中的信号是进一步研究的先决条件。在此,我们通过实验确定了 BLS 光谱中的高阶杂散信号,这些信号给光谱的解释带来了困难。实验证明,这些额外信号来自激光器和用于激光滤波的温控激光滤波器。我们的研究结果将有助于在排除本文所报告的杂散信号后,快速分配来自样品的信号。此外,自由光谱范围间隔的一系列高阶模式可作为弱宽带光源,在研究材料的光学响应方面具有巨大潜力。
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来源期刊
CiteScore
5.40
自引率
8.00%
发文量
185
审稿时长
3.0 months
期刊介绍: The Journal of Raman Spectroscopy is an international journal dedicated to the publication of original research at the cutting edge of all areas of science and technology related to Raman spectroscopy. The journal seeks to be the central forum for documenting the evolution of the broadly-defined field of Raman spectroscopy that includes an increasing number of rapidly developing techniques and an ever-widening array of interdisciplinary applications. Such topics include time-resolved, coherent and non-linear Raman spectroscopies, nanostructure-based surface-enhanced and tip-enhanced Raman spectroscopies of molecules, resonance Raman to investigate the structure-function relationships and dynamics of biological molecules, linear and nonlinear Raman imaging and microscopy, biomedical applications of Raman, theoretical formalism and advances in quantum computational methodology of all forms of Raman scattering, Raman spectroscopy in archaeology and art, advances in remote Raman sensing and industrial applications, and Raman optical activity of all classes of chiral molecules.
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