Integration of spectral coronagraphy within VIPA-based spectrometers for high extinction Brillouin imaging
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VIPA (virtually imaged phase array) spectrometers have enabled rapid Brillouin spectrum measurements and current designs of multi-stage VIPA spectrometers offer enough spectral extinction to probe transparent tissue, cells and biomaterials. However, in highly scattering media or in the presence of strong back-reflections, such as at interfaces between materials of different refractive indices, VIPA-based Brillouin spectral measurements are limited. While several approaches to address this issue have recently been pursued, important challenges remain. Here we have adapted the design of coronagraphs used for exosolar planet imaging to the spectral domain and integrated it in a double-stage VIPA spectrometer. We demonstrate that this yields an increase in extinction up to 20 dB, with nearly no added insertion loss. The power of this improvement is vividly demonstrated by Brillouin imaging close to reflecting interfaces without index matching or sample tilting.
Edrei , E , Gather , M C & Scarcelli , G 2017 , ' Integration of spectral coronagraphy within VIPA-based spectrometers for high extinction Brillouin imaging ' Optics Express , vol. 25 , no. 6 , 286050 , pp. 6895-6903 . DOI: 10.1364/OE.25.006895
© 2017, Optical Society of America. This work has been made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at www.osapublishing.org / https://doi.org/10.1364/OE.25.006895
DescriptionThis work was supported in part by the National Institutes of Health (K25EB015885, R33CA204582, U01CA202177); National Science Foundation (CMMI-1537027) and Human Frontier Science Program (Young Investigator Grant RGY0074).
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