Fig. 4
From: On-chip nonlocal metasurface for color router: conquering efficiency-loss from spatial-multiplexing
Experimental characterization of color routing microimage display based on on-chip q-BIC-assisted metasurface. a Conceptual illustration of color routing display functionality based on the on-chip q-BIC-assisted metasurface. Bottom: SEM image of the fabricated patterns. Scale bar: 250 nm. b Optical photograph of the fabricated “R” and “G” letters composed of q-BIC-assisted meta-diatom patterns. Scale bar: 30 μm. c Experimental setup to characterize the on-chip near-field microimages. d Measured extracted spectral profile comparison between the traditional grating out-coupler (GO) and the proposed on-chip q-BIC-assisted meta-router (q-BIC-RO). q-BIC-RO-R: q-BIC-assisted red meta-router; q-BIC-RO-G: q-BIC-assisted green meta-router. e, h, k Side view showing the functionality of the q-BIC-assisted metasurface for color routing. f, g Optical microscope images of “R” and “G” letters based on the traditional GO and the proposed on-chip q-BIC-RO design when guided waves with wavelengths of 640 nm and 530 nm are simultaneously propagating from the x-direction. Scale bar: 30 μm. i, j Optical microscope images of “R” and “G” letters, taken at the wavelength of 640 nm. Scale bar: 30 μm. l, m Optical microscope images of “R” and “G” letters, taken at the wavelength of 530 nm. Scale bar: 30 μm
