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1 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.
2 Schematic setup of the thin disk laser resonator and the pump module.
3 Numerical simulations of amplification of white noise by FWM and SRS as a function of propagation length.
4 The orthorectified aerial image and 5m DEM of Chiu-Shui River.
5 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).
6 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).
7 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.
8 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.
9 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.
10 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                                                   .
11 Calculation result of prospective THz-wave intensity via BNA-DFG under the consideration of perfect phase matching and absorption effect.
12 (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.
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