Integration of spectral coronagraphy within VIPA-based spectrometers for high extinction Brillouin imaging
Integration of spectral coronagraphy within VIPA-based spectrometers for high extinction Brillouin imaging
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DOI：
10.1364/oe.25.006895
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发表时间：
2017-03-20
期刊：
影响因子：
3.8
通讯作者：
Scarcelli, Giuliano
中科院分区：
文献类型：
--
作者：
Edrei, Eitan;Gather, Malte C.;Scarcelli, Giuliano
VIPA（虚拟成像相控阵）光谱仪实现了快速布里渊光谱测量，目前多级VIPA光谱仪的设计提供了足够的光谱消光来探测透明组织、细胞和生物材料。然而，在高散射介质或存在强背反射的情况下，例如不同折射率材料之间的界面，基于vipa的布里渊光谱测量受到限制。虽然最近采取了若干办法来解决这一问题，但仍然存在重大挑战。在这里，我们将用于太阳系外行星成像的日冕仪的设计调整到光谱域，并将其集成到双级VIPA光谱仪中。我们证明，这将产生高达20 dB的消光增加，而几乎没有增加插入损耗。这种改进的力量生动地证明了布里渊成像接近反射界面，没有索引匹配或样品倾斜。(C) 2017年美国光学学会
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. (C) 2017 Optical Society of America