Fig. 3From: Methodology of optimisation for a nanostructured two-photon absorption photodetector(a). Signal intensity map. A white dotted isoline delimits the surface \(\mathcal {A}\) where \(I_{s} < 20\% \, I_{\mathrm {s}}^{\text {max}}\). (b). Pump intensity map (c). Intensity maps of the signal and pump colocalisation. NDTPA is mostly generated in this area. (d). Pump intensity map in \(\mathcal {A}\). This pump intensity is detrimental since it mainly generates PASRHBack to article page