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1 The orthorectified aerial image and 5m DEM of Chiu-Shui River.
2 Schematic setup of the thin disk laser resonator and the pump module.
3 Experimental results using the proposed method: some typical 3-D geometries of the human face mask in wireframe mode.
4 20 × 24 pixel scan of a life-size mannequin at 324 m distance. fSample                         = 2 GHz, 7 × 106 pulses s−1, 16 ps histogram binning size, pattern length b = 16384 bits, 2 s per-pixel dwell time. Measurement acquired using a shallow-junction SPAD. (a) Close-up photograph of the scene. (b) Segmented surface plot of the scan, including several pixels locking onto background objects.
5 Normalized linear Stokes vector components demonstrate polarization synthesis.
6 Isointensity plot of an oblique spatiotemporal Bessel–Airy wave packet.
7 Example of color stripe indexing based on De Bruijn sequence                                                                                           (                                 k                                 =                                 5                                 ,                                 n                                 =                                 3                                 )                                                                                  [35].
8 Comparison of x-ray images of (a) cartilage on a chicken’s bone and (e) a tomato. The cartilage is shown clearly in (c) the differential phase image compared to (b) the absorption and (d) the scattering images. The inner structure of the tomato can be seen in (h) the scattering image, whereas (f) the absorption and (g) the differential phase images do not show any profiles.
9 Sketch of a microroll that can be fabricated  by rolling up strained layers. The tube wall represents a three- dimensional metamaterial consisting of a metal–semiconductor  superlattice containing quantum wells and metal gratings.
10 (a) Schematic of a four-taper-segment micropillar cavity. (b) and (c) Electric field density profile of the first- and second-order modes, respectively. (d) Electric field density profile of the third-order mode of the ten-taper-segment micropillar cavity. (e) Mode diagram as a function of taper segment number.
11 Example of 2D array of color-coded dots.
12 Second harmonic generation methods for studying chirality were developed in organic molecules before being applied to metamaterials. In (a), illustration of SHG from supramolecularly ordered chiral helicenes molecules. In (b), illustration of SHG from G-shaped nanostructures, arranged in a chiral unit cell. The incoming light is at 800 nm (near red color) and the detected signal is at 400 nm (near blue color).
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