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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 (a)–(d) Color fringe image acquired by a color CCD camera and its RGB components, (e) image results from the division operation applied to image in (b) and (d). The background is clipped to enhance the detail of the fringes, (f) binary image obtained from (d).
3 Schematic diagram of single-prism pulse compressor.
4 Experimental results of the signal and reference speckled beams with triangular aperture and cross-correlations between them in the first, second, and third columns, respectively.
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 (a) Schematic of chalcogenide–silica all-solid bandgap fiber. Red: chalcogenide strands. (b) Scanning electron micrograph of endface of a chalcogenide–silica bandgap fiber (core diameter                                                                         7.6                                                       μm                                                               , pitch                                                                         3.8                                                       μm                                                               , hole diameter                                                                         1.45                                                       μm                                                               ) polished by focused-ion-beam milling.
7 Effect of EOT on spatial information. The central figure shows the input probe beam generated with the DLP before the FWM. The top row shows the entangled images generated by the FWM process before the plasmonic structures, while the lower row shows the entangled images after transduction through the plasmonic structures.
8 A helical phase profile                                                          exp                              		                                     (                                 i                                 ℓ                                 ϕ                                 )                                                                                  converts a Gaussian laser beam into a helical mode whose wave fronts resemble an ℓ-fold corkscrew. In this case                                                          ℓ                              =                              3                                                   .
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10 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.
11 THz near-field images in the frequency domain. (a) and (b) Amplitude frequency maps at 300 GHz normalized to reference maps using 10- and 1-μm-thick 	    	      		X	      	    	  -cut LN crystals, respectively (visible image of the sample on the right hand side). (c)–(e) Expanded view for the conditions without probe filtering, with probe filtering using the 10-μm-thick sensor, and with probe filtering using the 1-μm-thick sensor, respectively (i.e., zones identified by the doted lines in the visible images).
12 (a)–(d) x–z cross sections of the beam intensity are shown as a function of focal depth, zf, for a focused Gaussian beam propagating through in silico fractal medium 2. For each panel, the result for a single simulation is displayed on top, with the corresponding averaged result over N=100 randomly generated fractal media displayed on the bottom. For visualization, all images are self-normalized to a maximum value of 1.
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