Through the looking glass: Raman spectroscopy of concealed samples in sealed containers using shaped laser light

Graham D. Bruce; Georgina E. Shillito; Lewis McMillan; George Dwapanyin; Mingzhou Chen; Kishan Dholakia

doi:10.1117/12.2649738

9 March 2023 Through the looking glass: Raman spectroscopy of concealed samples in sealed containers using shaped laser light

Graham D. Bruce, Georgina E. Shillito, Lewis McMillan, George Dwapanyin, Mingzhou Chen, Kishan Dholakia

Author Affiliations +

Proceedings Volume PC12428, Photonic Instrumentation Engineering X; PC1242807 (2023) https://doi.org/10.1117/12.2649738
Event: SPIE OPTO, 2023, San Francisco, California, United States

Abstract

In-situ, non-destructive chemical characterisation of visually identical samples, including those concealed in containers, is required in fields such as forensics, suspicious substance screening or product quality control. We present a variation of Raman spectroscopy which harnesses the fact that the Fourier transform of tightly-focussed Bessel beam is an annulus. This increases the collection of light originating beyond a container wall and simultaneously reduces the collection of light from the container, enabling non-contact, non-destructive detection of samples in sealed containers. Example measurements include alcoholic beverages in their original bottles and pharmaceuticals in opaque plastic containers.

Conference Presentation

Citation Download Citation

Graham D. Bruce, Georgina E. Shillito, Lewis McMillan, George Dwapanyin, Mingzhou Chen, and Kishan Dholakia "Through the looking glass: Raman spectroscopy of concealed samples in sealed containers using shaped laser light", Proc. SPIE PC12428, Photonic Instrumentation Engineering X, PC1242807 (9 March 2023); https://doi.org/10.1117/12.2649738

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