Fig. 5: Experimental results of the two multi-channel holographic devices.
From: Deep learning enabled topological design of exceptional points for multi-optical-parameter control
The first black box is the Wavelength Division Multiplex (WDM) metasurfaces: the image of I is reconstructed in the far field at 532 nm (a), and the image of II is reconstructed at 633 nm (b) in the S21 channel. The second box is the amplitude-phase multiplexing metasurfaces at λ = 633 nm: (c, d) Scanning electron micrograph (SEM) of the metasurface. When left circularly polarized light illuminates the metasurface, the Maxwell portrait and the Maxwell 1st and 2nd equations can appear on the S21 channel for grayscale imaging (e) and holographic imaging (f), respectively. Similarly, no image appears on the metasurface plane (g) under RCP incident light, while the PB phase encodes a holographic image (Maxwell 3rd and 4th equation) on the reflection plane (h). The scale bar of (e) and (g) is consistent with (c).
