ac9b04495_si_001.pdf (648.74 kB)
Single-Acquisition 2‑D Multifocal Raman Spectroscopy Using Compressive Sensing
journal contribution
posted on 2019-12-13, 19:20 authored by Pengfei Zhang, Guiwen Wang, Xiujuan Zhang, Yong-qing LiConfocal Raman microscopy is a powerful method for nondestructive
and noninvasive detection of chemicals with high spatial resolution,
but its long acquisition time hinders its applications in large-scale
monitoring of fast dynamics. Here, we report the development of a
compressive sensing technique for single-acquisition multifocal Raman
spectroscopy, which is capable of improving the speed of conventional
confocal Raman spectroscopy by 2–3 orders of magnitude. A sample
is excited with a 2-D multifocus pattern, and the Raman scatterings
from the multiple foci were projected onto the spectrometer’s
entrance in a 2-D array. The superimposed spectra within each row
of the array were processed with an algorithm such that the spectra
from the individual foci were retrieved in a single acquisition and
with reduced noise. The performances of the developed technique were
demonstrated by parallel Raman spectroscopy of multiple individual
particles as well as by single-acquisition confocal Raman imaging
of a large scale with high spatial resolution when combined with spatially
sparse sampling. The technique is expected to find wide applications
in investigating fast dynamics in large-scale biological systems.