Fig. 4: HgTe QDs-based photodetector empowered by laser-printed plasmonic BIC metasurface. | Light: Science & Applications

Fig. 4: HgTe QDs-based photodetector empowered by laser-printed plasmonic BIC metasurface.

From: Nonlinear light conversion and infrared photodetection with laser-printed plasmonic metasurfaces supporting bound states in the continuum

Fig. 4

a A 3D sketch, optical and false-color SEM image of the plasmonic nanobump array laser-printed on the drain and source contacts of the FET. b Reflection (solid curves) and photocurrent spectra (markers) of the HgTe QD photodetector with smooth (green) and patterned (red) Au electrodes. c Specific detectivity map (at 1.9 µm pump) as a function of the drain-source bias voltage and operating temperature. d Normalized current as a function of time (top panel) and modulation frequency (bottom panel) under excitation of 0.98 µm laser with 100 µs pulse width. Trigger electrical pulse is shown in gray color

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