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“Fingerprint” vs Handheld Raman applications and the different Optical Filters that enable them

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“Fingerprint” vs Handheld Raman applications and the different Optical Filters that enable them

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The exchange of energy between photons and vibrational modes of molecules that defines Raman scattering occurs for approximately one in a million incident photons. This exchange in energy between incident photon and molecule results in a shift in wavelength of the Raman scattered photon relative to the excitation wavelength, either a “Stokes” shift to lower energy, longer wavelength or “anti‐Stokes” shift to higher energy, shorter wavelengths. The low probability of this event makes detection of this informative, but elusive, Raman scattered signal from the dominant Rayleigh scattered photon signal like finding a photonic needle in a brightly illuminated haystack

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