Theoretical and experimental analysis of circularly polarized luminescence spectrophotometers for artifact-free measurements using a single CCD camera

Bruno Baguenard, Amina Bensalah-Ledoux, Laure Guy, François Riobé, Olivier Maury and Stéphan Guy ()
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Bruno Baguenard: Univ Lyon, Univ Claude Bernard Lyon 1, CNRS
Amina Bensalah-Ledoux: Univ Lyon, Univ Claude Bernard Lyon 1, CNRS
Laure Guy: ENS de Lyon, Univ Lyon, CNRS UMR 5182
François Riobé: ENS de Lyon, Univ Lyon, CNRS UMR 5182
Olivier Maury: ENS de Lyon, Univ Lyon, CNRS UMR 5182
Stéphan Guy: Univ Lyon, Univ Claude Bernard Lyon 1, CNRS

Nature Communications, 2023, vol. 14, issue 1, 1-11

Abstract: Abstract Circularly polarized luminescence (CPL) is a fast growing research field as a complementary chiroptical spectroscopy alternative to the conventional circular dichroism or in the quest of devices producing circularly polarized light for different applications. Because chiroptical signals are generally lower than 0.1%, conventional chiral spectroscopies rely on polarization time modulation requiring step-by-step wavelength scanning and a long acquisition time. High throughput controls motivated the development of CPL spectrophotometers using cameras as detectors and space polarization splitting. However, CPL measurements imposes careful precautions to minimize the numerous artifacts arising from experimental imperfections. Some previous work used complex calibration procedure to this end. Here we present a rigorous Mueller analysis of an instrument based on polarizations space splitting. We show that by using one camera and combining spatial and temporal separation through two switchable circular polarization encoding arms we can record accurate CPL spectra without the need of any calibration. The measurements robustness and their fast acquisition times are exemplified on different chiral emitters.

Date: 2023
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DOI: 10.1038/s41467-023-36782-9

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