Filter-based ultralow-frequency Raman measurement down to 2 cm-1 for fast Brillouin spectroscopy measurement

Xue Lu Liu, He Nan Liu, Jiang Bin Wu, Han Xu Wu, Tao Zhang, Wei Qian Zhao, Ping Heng Tan

Research output: Contribution to journalArticlepeer-review

13 Citations (Scopus)

Abstract

Simultaneous Stokes and anti-Stokes ultralow-frequency (ULF) Raman measurement down to ∼2 cm-1 or 60 GHz is realized by a single-stage spectrometer in combination with volume-Bragg-grating-based notch filters. This system reveals its excellent performance by probing Brillouin signal of acoustic phonons in silicon, germanium, gallium arsenide, and gallium nitride. The deduced sound velocity and elastic constants are in good accordance with previous results determined by various methods. This system can shorten the integration time of the Brillouin signal with a good signal-to-noise ratio by more than 2000-fold compared to a Fabry-Perot interferometer (FPI). This study shows how a filter-based ULF Raman system can be used to reliably achieve Brillouin spectroscopy for condensed materials with high sensitivity and high signal-to-noise ratio, stimulating fast Brillouin spectrum measurements to probe acoustic phonons in semiconductors.

Original languageEnglish
Pages (from-to)53110
Number of pages1
JournalReview of Scientific Instruments
Volume88
Issue number5
DOIs
Publication statusPublished - 1 May 2017

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