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dc.contributor.authorShillito, Georgina E.
dc.contributor.authorMcMillan, Lewis
dc.contributor.authorBruce, Graham D.
dc.contributor.authorDholakia, Kishan
dc.date.accessioned2022-03-04T17:30:02Z
dc.date.available2022-03-04T17:30:02Z
dc.date.issued2022-03-14
dc.identifier277816032
dc.identifier975914fb-f060-45d5-9f5a-b839fb600b80
dc.identifier85125871305
dc.identifier000768611900055
dc.identifier.citationShillito , G E , McMillan , L , Bruce , G D & Dholakia , K 2022 , ' To focus-match or not to focus-match inverse spatially offset Raman spectroscopy : a question of light penetration ' , Optics Express , vol. 30 , no. 6 , pp. 8876-8888 . https://doi.org/10.1364/OE.451496en
dc.identifier.issn1094-4087
dc.identifier.otherArXiv: http://arxiv.org/abs/2112.08877v1
dc.identifier.otherORCID: /0000-0003-3403-0614/work/109316083
dc.identifier.otherORCID: /0000-0002-7725-5162/work/109316246
dc.identifier.urihttps://hdl.handle.net/10023/24994
dc.descriptionFunding: The work was supported by funding from the UK Engineering and Physical Sciences Research Council (EP/P030017/1 and EP/R004854/1) and the H2020 FETOPEN project “Dynamic” (EC-GA 863203).en
dc.description.abstractThe ability to identify the contents of a sealed container, without the need to extract a sample, is desirable in applications ranging from forensics to product quality control. One technique suited to this is inverse spatially offset Raman spectroscopy (ISORS) which illuminates a sample of interest with an annular beam of light and collects Raman scattering from the centre of the ring, thereby retrieving the chemical signature of the contents while suppressing signal from the container. Here we explore in detail the relative benefits of a recently developed variant of ISORS, called focus-matched ISORS. In this variant, the Fourier relationship between the annular beam and a tightly focused Bessel beam is exploited to focus the excitation light inside the sample and to match the focal point of excitation and collection optics to increase the signal from the contents without out compromising the suppression of the container signal. Using a flexible experimental setup which can realise both traditional and focus-matched ISORS, and Monte-Carlo simulations, we elucidate the relative advantages of the two techniques for a range of optical properties of sample and container.
dc.format.extent13
dc.format.extent3079760
dc.language.isoeng
dc.relation.ispartofOptics Expressen
dc.subjectQC Physicsen
dc.subjectDASen
dc.subject.lccQCen
dc.titleTo focus-match or not to focus-match inverse spatially offset Raman spectroscopy : a question of light penetrationen
dc.typeJournal articleen
dc.contributor.sponsorNERCen
dc.contributor.sponsorEPSRCen
dc.contributor.sponsorEPSRCen
dc.contributor.sponsorEuropean Commissionen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Centre for Biophotonicsen
dc.contributor.institutionUniversity of St Andrews. Sir James Mackenzie Institute for Early Diagnosisen
dc.contributor.institutionUniversity of St Andrews. Biomedical Sciences Research Complexen
dc.identifier.doi10.1364/OE.451496
dc.description.statusPeer revieweden
dc.identifier.grantnumberNEH002227/1en
dc.identifier.grantnumberEP/P030017/1en
dc.identifier.grantnumberEP/R004854/1en
dc.identifier.grantnumber863203en


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