Fig. 2: Metalens with IST. | Nature Communications

Fig. 2: Metalens with IST.

From: Infrared beam-shaping on demand via tailored geometric phase metasurfaces employing the plasmonic phase-change material In3SbTe2

Fig. 2

A Schematic sketch of the working principle applied. The incident LCP light is converted to RCP radiation and focused according to the designed focal length. B Imprinted phase profile of the metalens consisting of concentric rings with equal phases. C Photograph of the fabricated 8 × 8 mm² metasurface consisting of 4 million rotated IST antennas. D Measured intensity distribution in the xz-cross section clearly displaying a focal spot 11.5 cm from the metasurface. E Simulated intensity distribution of a metasurface with the applied phase pattern from (B). F Cross-section of the measured focal spot revealing a beam waist w0 of 189 µm.

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