Fig. 4: Reconfigurable edge-detection experiment.
From: Reconfigurable image processing metasurfaces with phase-change materials
a Schematic of the experimental setup. b Unfiltered input image (corresponding to the logo of our institution) obtained when the metasurface is removed from the setup in panel a (scalebar = 50 µm). c Edge-detected image obtained with the metasurface present and at room temperature. d Horizontal slices of the output intensity taken at the location marked by the white dashed line in (c), for a metasurface temperature slightly below (T = 58 °C, blue curve) and slightly above (T = 68 °C, red shaded areas, extracted from the corresponding image in e) the transition temperature of VO2. The blue curve has been rescaled by a factor of 6x to aid comparison. e Filtered images obtained for different temperatures of the metasurface as the device is heated. The temperature of each measurement is reported in the bottom right corner of each image. f Same as in panel e but for the case in which the device is cooled.
