Fig. 1: BLS spectra of liquids.
From: Consensus statement on Brillouin light scattering microscopy of biological materials
a–e, Example BLS spectra of distilled water (black circles) and cyclohexane (red squares) measured using different spectrometer designs (normalized to unity). a, Tandem Fabry–Perot (TFP) spectrometer. b, Virtual imaged phase array (VIPA) spectrometer with electro-optic modulator reference peaks45 at 13 GHz. c, Stimulated Brillouin scattering (SBS) spectroscopy. d, Time-resolved Brillouin scattering (TRBS) microscopy. e, Impulsive SBS (I-SBS) spectroscopy. The insets in d and e show the respective measured time-resolved data. The I-SBS frequency shift depends solely on sound speed, whereas for spontaneous BLS, SBS and TRBS, the refractive index reduces the frequency difference between water and cyclohexane (see also Supplementary Section 1.2). Horizontal dashed and solid lines represent measurement and scan ranges of the respective measurements. Lines between data points are presented as a guide to the eye.
