Fig. 5
From: Methodology of optimisation for a nanostructured two-photon absorption photodetector
(a). Spectral distribution of the signal intensity of the monochromatic structure (dm=1.21 μm, wm=0.34 μm, hm=0.388 μm and h0=0.05 μm). (b). Spectral distribution of the signal intensity of the bichromatic structure (db=1.64 μm, \(w_{b_{1}} = 0.29 \, \mu \)m, \(w_{b_{2}} = 0.25 \, \mu \)m, \(w_{b_{3}} = 0.21 \, \mu \)m, hb=0.190 μm and h0=0.05 μm). Evolution of G (c) and F (d) values under a focused configuration. The pump is at a fixed wavelength 1.06 μm, and focused with a half-cone angle of 2∘