Fig. 4: Measurement of coherent thermal hologram.
From: Ultra-coherent meta-emitter tailors arbitrary thermal wavefront
a Schematic diagram of the hologram of “8”. b, c Holographic pattern and image of the top side of sample. d The intensity distribution of y-polarized, x-polarized light. e–g Holographic patterns for “0”, “4” and “7”, respectively. h Schematic diagram of spatial multiplexed holography. By exciting different grooves, two holographic states can be switched. i Image of the top side of the spatial multiplexed sample. 5 slits with sequential numbers (1–5) are marked in the figure. Red (1, 3, 5) and blue (2, 3, 4) lines denote the excitation WGs for the hologram of ‘5’ and ‘2’, respectively. The shadow region in the center denotes the spatial multiplexed area. j, k Holographic patterns for ‘5’ and ‘2’, respectively. Corresponding excitation WG numbers are marked below. Scalar bar: 1 cm.
