Abstract
We propose and demonstrate a spectrally-resolved photoluminescence imaging setup based on the so-called single pixel camera – a technique of compressive sensing, which enables imaging by using a single-pixel photodetector. The method relies on encoding an image by a series of random patterns. In our approach, the image encoding was maintained via laser speckle patterns generated by an excitation laser beam scattered on a diffusor. By using a spectrometer as the single-pixel detector we attained a realization of a spectrally-resolved photoluminescence camera with unmatched simplicity. We present reconstructed hyperspectral images of several model scenes. We also discuss parameters affecting the imaging quality, such as the correlation degree of speckle patterns, pattern fineness, and number of datapoints. Finally, we compare the presented technique to hyperspectral imaging using sample scanning. The presented method enables photoluminescence imaging for a broad range of coherent excitation sources and detection spectral areas.
Highlights
PL imaging in the visible spectral range is nowadays a well mastered task solved by standard hyperspectral imaging approaches[5,6,7] such as variable spectral filters and push broom or whisk broom scanners
A laser speckle pattern is a random intensity pattern resulting from the interference of many wavefronts arising due to multiple scattering of coherent light[23]
We focused on ensuring that the acquired random patterns are not correlated with each other
Summary
We propose and demonstrate a spectrally-resolved photoluminescence imaging setup based on the so-called single pixel camera – a technique of compressive sensing, which enables imaging by using a single-pixel photodetector. We propose and demonstrate a simple lensless hyperspectral PL camera that allows PL imaging by using a single-pixel detector – a spectrometer providing the camera with spectral resolution[10,11] Our approach makes it possible to decrease the number of measurements, compared to sample scanning, to about 20% of the image pixel number, while keeping the primary image information. In our measurements we employ the so-called single-pixel camera concept[14] where an image is encoded by a series of random patterns and the total intensity of light emitted from the sample, is detected and used for the image reconstruction. To generate the speckle pattern, we, instead, employ a simple approach using a moving diffusor, which can be incorporated into any laser-excited PL detection This leads to a PL imaging setup of unmatched simplicity.
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