Photons can be confined in optical microcavities both spectrally and spatially, which allows us to study the light–matter interaction in both weak and strong coupling regimes. While the former is identified by the Purcell factor, which quantifies the suppression or enhancement of the spontaneous emission rate of the quantum emitters coupled to the cavity modes, the latter is identified by the formation of hybrid photon–matter modes called exciton polaritons and thus represents an avoided crossing in the spectra. Until now, various imaging and spectroscopic techniques have been extensively used to study exciton polariton formation in optical microcavities, and the coupling between excitons and photons has been statically and dynamically tuned. Herein, we demonstrate the hyperspectral imaging of exciton polaritons in optical microcavities. Two thin metal films acting as reflectors and a polymer matrix containing a collection of quantum emitters form a hybrid system for polariton imaging. We show a strong exciton–photon interaction between photons confined in the microcavity and Frenkel excitons of dye molecules placed inside the optical microcavity. We find that exciton polaritons can be imaged and spatially mapped in the optical microcavity by using hyperspectral imaging in the visible region. We envision that our findings will help us to understand exciton polariton formation in the spectral and spatial domains at the same time across different coupling regimes.

中文翻译：

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光学微腔中激子极化子的高光谱成像

光子可以在光谱和空间上被限制在光学微腔中，这使我们能够研究弱耦合和强耦合状态下的光与物质相互作用。前者是通过珀塞尔因子来识别的，该因子量化了耦合到腔模式的量子发射器的自发发射率的抑制或增强，而后者是通过称为激子极化激元的混合光子-物质模式的形成来识别的，因此代表避免光谱交叉。到目前为止，各种成像和光谱技术已被广泛用于研究光学微腔中激子极化子的形成，并且激子和光子之间的耦合已被静态和动态调谐。在这里，我们展示了光学微腔中激子极化子的高光谱成像。充当反射器的两片金属薄膜和包含一组量子发射器的聚合物基质形成了用于偏振子成像的混合系统。我们展示了限制在微腔中的光子与放置在光学微腔内的染料分子的弗兰克尔激子之间存在强烈的激子-光子相互作用。我们发现，通过使用可见光区域的高光谱成像，可以在光学微腔中对激子极化子进行成像和空间映射。我们设想我们的发现将帮助我们了解不同耦合状态下同时在光谱和空间域中激子极化子的形成。