Abstract
This work develops an integrated system combining digital holography with confocal Raman spectroscopy using a single monochromatic laser source. One unique, and useful, aspect of the approach is that it utilizes backward scattered light permitting operation without contacting the sample, i.e. as a short-range ‘standoff’ sensor. Chemical composition analysis of microparticles is available through the Raman component while particle imaging is achieved with the holographic component. Demonstrations of the characterization capability are presented for non-spherical microparticles in the ∼10–200 μm size range. These include sugar and microbial-pigment particles and demonstrate that the integrated system may have potential for applications in biomedical research for species-specific sensing. The results also suggest that the characterization capability could be applied to airborne respirable-sized particles in free-flowing aerosol form.
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