Fig. 2: Characterization of the pixelated colour conversion for 3D light-field sensing.
From: X-ray-to-visible light-field detection through pixelated colour conversion
a, Chromaticity responses of single azimuthal detectors composed of three-, four- and five-colour perovskite nanocrystals as a function of the direction of incident light. b, CIE tristimulus values X, Y and Z of the output luminescence of a single azimuth detector as a function of the direction of incident light. AU, arbitrary units. c, Azimuth resolution measurement for visible light (405 nm) using a single azimuth detector, with a minimum detectable angular change of 0.0018°. Excitation (Ex) wavelength, 450 nm. d, Two types of colour map recorded from two perpendicularly aligned azimuth detectors with light incident from different azimuth angles φ and elevation angles θ. e, Contour lines extracted from the two colour maps in d. A unique incidence direction can be determined by combining the colour values from two azimuth detectors. f, Top view of the azimuthal detector arrays for imaging the 3D light direction, in which adjacent pixels of perovskite nanocrystals are aligned perpendicularly. The two detectors encircled by the ellipse can determine the angle of the beam incident on the centre point of the ellipse. Inset, side view of a patterned pixel. g, Photograph of a 3D light-field sensor fabricated by integrating the perovskite nanocrystal array into a colour CCD. Inset, a section of the microscopy image of nanocrystal-based azimuth detectors. Scale bar, 150 μm (g).
