Fig. 1: Diffraction-based miniaturized spectrometer employing computational reconstruction.

a Diffraction of monochromatic light at a circular aperture. In the Fraunhofer (far-field) limit, this gives rise to the well-known Airy disks. b Concept of presented one-to-broadband diffraction-based reconstruction spectrometry at a pinhole demonstrated by Chen et al.¹¹. If the diffraction patterns from selected monochromatic wavelengths are used as input, the original broadband spectrum can be recovered by reconstruction algorithms from the diffraction pattern at an arbitrarily shaped pinhole. c Ultimate schematic idea of the proposed computational reconstruction technique proposed by Chen et al.¹¹