Figure 2: Metal-like monoclinic phase of VO2.

(a–c) Optical images of an AA-treated VO2 nanobeam obtained through heating treatment. The inset shows the corresponding SAED of the same region marked by the yellow and red circles before and after heating treatment, respectively. Scale bars, 10 μm. (d,f) Images of the near-field scattering amplitude for the AA-treated VO2 nanobeam before and after heating treatment, obtained by the s-SNIM with the incident wavelength (λ) of 10.247 μm. (e,g) The corresponding near-field scattering amplitude as a function of the position along the nanobeam.