Fig. 2: Microcavity photodetector characterization.
From: Electronic transport driven by collective light-matter coupled states in a quantum device
a QCD processed into double-metal cavity array. The schematic diagram illustrates the electric field Ez distribution of the fundamental cavity resonance. b Simulated reflectivity map from cavity arrays extrapolated from experiments (see Methods and section 2 of S.I.). The microcavity resonance EC is inversely proportional to the ridge width EC ~ 1/w. Measurements are indicated in circles. Red circles: polariton resonances EUP and ELP arising from the coupling of the fundamental cavity resonance with the intersubband plasmon at an energy \({\widetilde{E}}_{12}=130{{{{{\rm{meV}}}}}}\). White circles: second order cavity resonance (see Methods). c Calculated quantum absorption efficiency, i.e. percentage of the incident power absorbed by the active region. d Measured (full lines) and computed (dotted lines) photocurrent spectra for structures with various cavity resonance EC (labels on the spectra). e Integrated photocurrent signal from measurements (dots) and model (full line) as a function of EC. f Contour plot constructed from the measured photocurrent spectra as a function of the cavity energy and photon energy.
