Fig. 2: Fabrication and characterization of wired-antenna-enhanced QWIPs. | Nature Communications

Fig. 2: Fabrication and characterization of wired-antenna-enhanced QWIPs.

From: Synchronously wired infrared antennas for resonant single-quantum-well photodetection up to room temperature

Fig. 2

a QW design, and numerical conduction band profile and wave functions based on experimental dopant density distribution. b Scanning electron micrograph of SWAs with Z-shaped (S = 0.29 μm) and c S-shaped (S = 0.22 μm) wires. Bar: 1 μm. d Responsivity spectrum of the reference Brewster-angle detector (top), absorption spectra for Z-shaped SWAs with various S values measured for θ = 26°, s-polarized incidence (solid lines, middle) and calculated for θ = 0° (broken lines, middle), and the corresponding responsivity spectra for θ = 0° (bottom). Equiefficiency (ηconv) lines are also plotted. e, f Other properties for the detector with the maximum responsivity (Z-shaped, S = 0.29 μm). e Polarization angle dependence of Rp. Results for the Brewster-angle detector are also shown for reference. f Incidence-angle dependence of ηconv for p- (right) and s-polarization (left). Vertical lines denote the FOV/2 at half height.

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