Extended Data Fig. 3: Temporal and spectral characterization of natural vibrations of single microbial cells.
From: Single-particle photoacoustic vibrational spectroscopy using optical microresonators
Laser transmission (a) and corresponding vibrational spectra (b) of a single Aspergillus niger spore (i), Aspergillus Sydowii (ii) and cyanobacterium (iii). The navy and red curves are experimental data and fittings, respectively. Vibrations of the microresonator are also indicated. The mode indices of these vibrational modes are identified by matching the spectral features to numerical calculations. The (1,0) breathing mode could not be supported in microbial cells because of the incompressible property of their cytoplasm (Supplementary Note II for details). The quality factors of the vibrational modes of microbial cells are within 5 ~ 30. In these measurements, the microbial cells are placed on the microspherical optical cavity about 10 ~ 20 μm away from its equator. Insets: SEM and TEM images of microbial cells. Scale bars: 1 μm.
