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1 (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.
2 Fundamental mode transverse electric field intensity (Et2) distributions at 1.45 μm (upper figures) and 1.75 μm (lower figures) wavelengths, for nearly zero-dispersion flattened PCFs with Λ=2.3  μm and d=0.61  μm for (a) α=0° and β=0°, (b) α=30° and β=0°, (c) α=0° and β=30°, (d) α=0° and β=0°, (e) α=30° and β=0°, and (f) α=0° and β=30°.
3 Numerical simulations of amplification of white noise by FWM and SRS as a function of propagation length.
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 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.
6 Examples of buccal squamous epithelial cells found on prepared specimen slides. (a) Representative transmission image of two overlapping cells and (d) the corresponding spatially resolved map Σ(x, y) calculated by PWS. (b) Example of a folded isolated cell and (e) the corresponding map of Σ. (c) Isolated, non-folded cell classified as “suitable” for our study and (f) the corresponding Σ(x, y).
7 Decomposition of natural images into Fourier components. (a) All images can be expressed as a sum of 2D Fourier basis functions [e.g., (b)] by taking the sum over all values in (c) the basis-scaled image.
8 Schematic setup of the thin disk laser resonator and the pump module.
10 Example of color stripe indexing based on De Bruijn sequence                                                                                           (                                 k                                 =                                 5                                 ,                                 n                                 =                                 3                                 )                                                                                  [35].
11 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.
12 Calculation result of prospective THz-wave intensity via BNA-DFG under the consideration of perfect phase matching and absorption effect.