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. 2015 Oct 22;6:8636. doi: 10.1038/ncomms9636

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(a) 2D colour plot of the calculated modulation amplitude of the MD contribution to Er³⁺ emission at 1.5 μm upon the VO₂ phase-change, as a function of TiO₂ and VO₂ thicknesses. (b) Evolution of the branching ratio of ED (red) and MD (blue) emission as a function of the VO₂ thickness (where as indicated by the black line in a), before (solid lines) and after (dashed lines) inducing the VO₂ insulator-to-metal transition. The black line labels the VO₂ thickness used in our experiment. (c,d) Experimental and calculated spectra for Er³⁺ ions when VO₂ is in the (c) insulating state and (d) metallic state. Experimental spectra are shown in shaded red and blue colour, respectively, whereas theoretically predicted spectra are shown as black solid lines. Exp, experimental; norm, normalized.

Inline graphic — (a) 2D colour plot of the calculated modulation amplitude of the MD contribution to Er³⁺ emission at 1.5 μm upon the VO₂ phase-change, as a function of TiO₂ and VO₂ thicknesses. (b) Evolution of the branching ratio of ED (red) and MD (blue) emission as a function of the VO₂ thickness (where as indicated by the black line in a), before (solid lines) and after (dashed lines) inducing the VO₂ insulator-to-metal transition. The black line labels the VO₂ thickness used in our experiment. (c,d) Experimental and calculated spectra for Er³⁺ ions when VO₂ is in the (c) insulating state and (d) metallic state. Experimental spectra are shown in shaded red and blue colour, respectively, whereas theoretically predicted spectra are shown as black solid lines. Exp, experimental; norm, normalized.