Integration of spectral coronagraphy within VIPA-based spectrometers for high extinction Brillouin imaging

Eitan Edrei, Malte C. Gather, Giuliano Scarcelli

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

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.
Original languageEnglish
Article number286050
Pages (from-to)6895-6903
Number of pages9
JournalOptics Express
Volume25
Issue number6
Early online date15 Mar 2017
DOIs
Publication statusPublished - 20 Mar 2017

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