Fig. 2: The phase change performance of the VO2 cavities.
From: Durable and programmable ultrafast nanophotonic matrix of spectral pixels
a, Heating and cooling curves of the as-prepared VO2 material. a.u., arbitrary unit. b, Experimental (Exp.) and simulated (Sim.) results of the spectra and colour performance for cavities with various thicknesses of the VO2 layer, before and after the phase transition (\({t}_{{{\rm{VO}}}_{2}}\) = 30, 40, 60, 80 and 120 nm from bottom to top). The y axis for each box has a separate scale of 0 to 1. For simplicity, we only labelled 0 to 1 in the bottom box. c, The colour modulation for VO2 cavities with different VO2 thicknesses in the CIE 1931 colour diagram (the thickness ranges from 10 to 150 nm). Blue discs are for cavities in the insulating state and red squares are for cavities in the metallic state. d, The reflective spectra of a VO2 cavity (\({t}_{{{\rm{VO}}}_{2}}\) = 50 nm) at various intermediate states by applying different input signals. e, The measured reflectance for the cavity in d at 500 nm at each intermediate-state level over 11 voltage cycles (the error bars indicate the standard deviation of the cycles, and the solid discs indicate the average value).
