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1 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.
2 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.
3 The orthorectified aerial image and 5m DEM of Chiu-Shui River.
4 Normalized net round-trip gain                                                                                                       G                                                               s                                 p                                                                                                                         as a function of pump-signal and idler-signal phase mismatches                                                                         δ                                                         ν                                                               p                                 s                                                                                    Ω                           L                                                                and                                                                         δ                                                         ν                                                               i                                 s                                                                                    Ω                           L                                                               , respectively, for                                                                         N                           =                                                                                                                              (                                                                           π                                       /                                       2                                                                        )                                                                                             2                                                                                          . GVD is neglected, so the AM and PM eigenmodes are decoupled. (a) Gain for AM eigenmodes, (b) gain for PM eigenmodes.
5 Numerical simulations of amplification of white noise by FWM and SRS as a function of propagation length.
6 Normalized linear Stokes vector components demonstrate polarization synthesis.
7                      Example of color stripe indexing based on De Bruijn sequence                                                                                           (                                 k                                 =                                 5                                 ,                                 n                                 =                                 3                                 )                                                                                  [35].
8
9 Colour “Lena” (a), reconstructed using 51 (b) and 501 (c) independent scans.
10 Plasmon energy ω in electron volts of a composite gold NT and gold core system, for q=0 and m=2, using ωp=1.37×1016  Hz, plotted versus δ and d, when a1=7  nm.
11 Transmission spectra through a lattice of  periodic gold film perforated with Z-shaped slits with slit widths                                                                                                                                        w                                                                                             2                                                                                    =                           25                                                               , 50, 100,                                                                         150                                                       nm                                                               .                                                                         h                           =                           500                                                       nm                                                               ,                                                                         l                           =                           800                                                       nm                                                               ,                                                                                                                                       s                                                                                             2                                                                                    =                           450                                                       nm                                                               ,                                                                                                                                        w                                                                                             1                                                                                    =                                                                                          w                                                                                             3                                                                                    =                           150                                                       nm                                                               .
12 Comparison of quantitative phase maps with fluorescent assays during an optoinjection experiment: a) phase map and b) propidium iodide fluorescence (optoinjection assay) 5 min after irradiation ; c) phase map and d) Calcein AM fluorescence (viability assay) after 90 min incubation. Two cells were successfully optoinjected - one proved viable (solid arrow) while the other (dashed arrow) was necrotic after 90 min. Note the significant decrease in the optical thickness of the non-viable cell. Scale bars 20 μm.