Fig. 2: Simulation and experiment of single-pixel metasurface based on localized surface plasmon (LSP).
From: Electrically programmable pixelated coherent mid-infrared thermal emission
a SEM image (scale bar:Â \(50\,{{\upmu }}{{{\rm{m}}}}\)) of two pixels comprised of perpendicular Au nanorods with distinct lengths on a single graphene channel. The zoom-in images (scale bar: \(1\,{{\upmu }}{{{\rm{m}}}}\)) illustrate the upper pixel (red rectangle) with a longitudinal edge of \(1\,{{\upmu }}{{{\rm{m}}}}\) along the \(x\)-axis and the lower pixel (blue rectangle) with a longitudinal edge of \(700\,{{{\rm{nm}}}}\) along the \(y\)-axis. The polarization angle \(\varphi\) is defined with respect to \(y\)-axis. b Measured emissivity spectra of the upper pixel at \(5.3\,{{\upmu }}{{{\rm{m}}}}\) (red line) with a polarization angle of \(\varphi=90^\circ\) and the lower pixel at \(3.9\,{{\upmu }}{{{\rm{m}}}}\) (blue line) with \(\varphi=0^\circ\). c Measured polar plots of the emissivity peaks across the polarization angles from \(0^\circ\) to \(180^\circ\). Two distinct orthogonal polarization states are evident for the two pixels.
