Figure 1: rGO holograms by a single femtosecond pulse for 3D images with wide viewing angles and colour images.
From: Athermally photoreduced graphene oxides for three-dimensional holographic images
(a) Schematic illustration of the optical digitalization of refractive-index/phase modulation by the athermal photoreduction using a single fs pulse. The subwavelength-scale phase modulation from 0 to π is finely tuned by the intensity of a fs beam. The area-by-area parallel digitalization is achieved through an objective capable of generating MMAs with variant intensities in each focal spot corresponding to the phase correlation. (b) Scheme of wide-angle 3D images by confining the photoreduction at a subwavelength scale through increasing the NA of the parallel digitalization objective. (c) Reconstruction of colour objects through the wavelength-multiplexed phase hologram recorded in GO polymers.
