CPL photoscopy: circularly polarized luminescence detected by chromaticity differences

Circularly polarized luminescence (CPL) is attracting growing interest for a wide range of applications, spanning from materials with advanced optical properties to innovative imaging techniques. The traditional approach to CPL consists in measuring the emission intensity difference between the left and right polarizations of light and usually requires spectral separation through color filters or a monochromator. In this work, we show that, under certain circumstances, it is possible to extract CPL information simply from the chromaticity values of a pair of photographs taken under different polarizations. This novel technique requires cheap instrumentation, offers complementary features with respect to the traditional method and could potentially be applied to CPL imaging.