Fig. 1: Structural schematic illustration and metasurface design.
From: Scalable on-chip diffractive speckle spectrometer with high spectral channel density
a The schematic diagram of the proposed spectrometer. b The simulated transmittance of the slot array. c The schematic diagram of the collimation metalens. d The phase profiles of the collimation lens. e The simulated optical field distribution of the lightwave collimation. f The simulated phase profile of the slot array. g The schematic diagram of the disordered metasurface. h The phase profiles of the disordered metasurface. i The simulated optical field distribution of the wave propagation through metasurface
