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1 Experimental results using the proposed method: some typical 3-D geometries of the human face mask in wireframe mode.
2 Computer simulation of the light- intensity distribution of the interference pattern for hexagonal right-handed (RH) as well as left-handed (LH) photonic chiral structures using                                                                         6                           +                           1                                                                beam geometry. (a) 3D interference intensity distribution for RH structures. (c) Intensity profile in                                                                         x                           −                           z                                                                plane. (b) and (d) correspond to (a) and (c) for LH photonic chiral structures.
3 Supplementary epifluorescence collection through a ring of optical fibers. (a) Top: CAD-drawing of a custom fiber-ring holder placed under an objective. Bottom: Closeup view showing the ring-like arrangement of the fiber tips. Only five of eight fibers are shown. Fluorophores are 2-photon excited in the focus of an infrared laser beam (red), causing isotropic fluorescence emission (green). (b) Left: Top view of the ring-like arrangement of eight 1-mm diameter fibers. Right: Dual-channel detection in a custom 2PLSM setup. Optical fibers were bundled and placed in front of a second PMT.
4                      Ghost imaging: coincidence measurements of two beams of entangled photons—one of which interacts with an object and one of which doesn’t—can be used to reconstruct a “ghost” image of the object.
5 Calculation result of prospective THz-wave intensity via BNA-DFG under the consideration of perfect phase matching and absorption effect.
6                      Transfer of angular momentum in optical tweezers. A trapped object can be rotated either by the transfer of SAM from a circularly polarized beam (left) or by the transfer of OAM from a high-order Laguerre–Gaussian beam.
7                      Example of color stripe indexing based on De Bruijn sequence                                                                                           (                                 k                                 =                                 5                                 ,                                 n                                 =                                 3                                 )                                                                                  [35].
9 Co-registered image of the change in blood flow image (Fig. 3A) with the projection view image of the blood vessel network obtained by the OMAG method after the injury (Fig. 4B). The color map is the same as in Fig. 3A. The grayscale of the OMAG image was inverted such that the blood vessels appear dark for better contrast.
10 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                                                               .
11                      Normalized intensity (top) and phase (bottom) profiles of some superpositions of Laguerre–Gaussian modes:                                                          L                                                                                                   G                                                                                                      01                                                                                             +                              L                                                                                                   G                                                                                                      05                                                                                                                  ,                                                          L                                                                                                   G                                                                                                      0                                    −                                    5                                                                                             +                              L                                                                                                   G                                                                                                      05                                                                                                                  , and                                                          L                                                                                                   G                                                                                                      10                                                                                             +                              L                                                                                                   G                                                                                                      05                                                                                                                   (left to right).
12 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.