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Fig. 11 | PhotoniX

Fig. 11

From: Imaging based on metalenses

Fig. 11

Other imaging applications of metalenses. (a) Left panel: SEM image of a portion of a fabricated metalens. Right upper panel: OCT images of fruit flesh (grape) obtained using a ball lens catheter and the nano-optic endoscope. Right lower panel: ex vivo images of swine airway using a ball lens catheter and the nano-optic endoscope [117]. Scale bars: 500 μm. (b) Left panel: geometry of the acoustic metalens formed by holey-structured metamaterials. The periodic holes are filled with water and organized on a square lattice in a brass matrix. Right panel: The imaging object. The calculated pressure field distributions at the output surface (middle) and at the internal image plane (right) [ 111]. (c) Left panel: illustration of the imaging concept: The L-shaped aperture is imaged on a screen with the help of the nonlinear metalens consisting of C3 nanoantennas. Right panel: nonlinear imaging of double slit apertures [113]. (d) Left panel: SEM image of the plasmonic metalens designed for a focal length of 500 μm. Right upper panel: measured and Simulated SHG distribution for planes along the z-propagation direction behind the metalens showing the evolution of the image formation. A clear upright real image of the letter L is formed at z ≈ 1000 μm. The metalens works as a convex lens for a spin conversion from RCP to LCP so that the real image is formed behind the metalens with the magnification of − 1. Right lower panel: the nonlinear metalens acts as a concave lens which images an upside down virtual image of the letter L for LCP. The measured image is obtained with a magnification of 0.35 [113]. White scale bars: 20 μm

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