Figure 4: rGO holograms for 3D colour images.
From: Athermally photoreduced graphene oxides for three-dimensional holographic images
Typical examples of microscopic images of sections of rGO holograms produced by objectives with different values of the NA. Scale bars, 5 μm. The insets show examples of intensity cross-sections of constitutive pixels with an effective size of 2 μm (a), 1 μm (b), 0.75 μm (c) and 0.55 μm (d). (e) Viewing angle as a function of the size of the constitutive pixel. The circles are experimental data and the blue curve presents calculation results. The inset shows reconstructed images of a rGO hologram with a pixel size of 0.55 μm captured at different viewing angles. The liquid crystal-based spatial light modulator (SLM, indicated by the arrow) with a pixel size of 8 μm has a limited viewing angle of ∼5 degrees. (f) Images of reconstructed 3D objects, two teapots, captured at different depths. (g) Reconstruction of colour objects, two balloons through a wavelength-multiplexed phase hologram recorded in GO polymers.
