Figure 9:

Applications of wide-angle metalenses for flat large-FOV imaging and beam steering.

(A) Comparison of the 0th and 1st order diffraction at different wavelengths between the theoretical calculation and the corresponding measurement by Fourier transformation through GCO-0201M and the 1D quadratic metalens. Adapted with permission from ref. [89]. Copyright 2018, WILEY-VCH. (B) Spatial frequency measurement for a Bessel metalens (left) and meta-hologram (right) at 10.6 μm wavelength using a 2D quadratic metalens. Adapted with permission from ref. [82]. Copyright 2021, WILEY-VCH. (C) Schematic and performance of beam steering by the quadratic metalens operating at the wavelength of 532 nm. Adapted with permission from ref. [74]. Copyright 2017, Optical Society of America. (D) Measured far-field power patterns at the frequency of 19 GHz when a circularly polarized antenna is transversely shifted. Right insets show a perspective view of the quadratic metalens and the schematic of the unit cell. Adapted with permission from ref. [91]. Copyright 2018, WILEY-VCH.