Fig. 3: Characterization of the device in the ultrahigh-CPER mode.
a Microscopic photo picture of the integrated circular polarization detector dimer in the ultrahigh-CPER mode. The red and blue circles indicate the light spot positions for the detector dimer in the LCP-responsive and RCP-responsive ultrahigh-CPER mode, respectively. b Ellipticity angle dependent photocurrents of the detector dimer in the LCP-responsive ultrahigh-CPER mode and in the RCP-responsive ultrahigh-CPER mode at different light power. c Noise current spectra of the detector dimer in the LCP-responsive ultrahigh-CPER mode at χ = 45° (LCP) and χ = 135° (RCP, silent state). Both measured data and fitted results based on a theoretical noise model are presented. The black squares denote the background noise of the instrument. Inset: photocurrent at χ = 135° in real time. d Responsivity of the detector dimer as a function of modulation frequency. Inset: waveform at the modulation frequency of 333 Hz. The rise time and the fall time, defined as the time for the photocurrent to change between 10% and 90% of the maximum value, are 62 μs and 64 μs, respectively. e Contour of CPER (λ, f) of the detector dimer in the LCP-responsive ultrahigh-CPER mode based on experimental data. Plight = 281 μW. f CPER spectra (squares) at three modulation frequencies extracted from e at the dashed lines, accompanied by the calculated results (solid lines) based on the simulated photoresponses and fitted noise spectra. g Diagram of the light ellipticity-dependent single-pixel imaging setup. h Light ellipticity-dependent imaging result in the ordinary circular polarization detection mode, where only the left photosensitive region of the detector dimer is illuminated by the incident light. Plight = 500 μW. f = 333 Hz. The blue or the red circle on top of the image marks out RCP or LCP light that sweeps over the corresponding domain. i Light ellipticity-dependent imaging result of the detector dimer in the LCP-responsive ultrahigh-CPER mode. The diagrams in (h) and (i) indicate the positions of the light spot
