Abstract
Polarimetric imaging has proved its value in medical diagnostics, bionics, remote sensing, astronomy, and in many other wide fields. Pixel-level solid monolithically integrated polarimetric imaging photo-detectors are the trend for infrared polarimetric imaging devices. For better polarimetric imaging performance the high polarization discriminating detectors are very much critical. Here we demonstrate the high infrared light polarization resolving capabilities of a quantum well (QW) detector in hybrid structure of single QW and plasmonic micro-cavity that uses QW as an active structure in the near field regime of plasmonic effect enhanced cavity, in which the photoelectric conversion in such a plasmonic micro-cavity has been realized. The detector's extinction ratio reaches 65 at the wavelength of 14.7 μm, about 6 times enhanced in such a type of pixel-level polarization long wave infrared photodetectors. The enhancement mechanism is attributed to artificial plasmonic modulation on optical propagation and distribution in the plasmonic micro-cavities.
Highlights
National Laboratory for Infrared Physics, Shanghai Institute of Technical Physics, Chinese Academy of Sciences, 500 Yutian Road, Shanghai 200083, P
In ideal cases the transverse magnetic (TM) light can generate photocurrent while the transverse electric (TE) light is forbidden, the non-ideal factors, in the structural and fabrications of the Plasmonic micro-Cavity Quantum Well Infrared Detector (PCQWID) will introduce scatterings, creating Ez for TE light and reducing Ez for TM light
To quantitatively analyze the polarization discriminating capability, we introduce Equation 1 to express the extinction ratio at the cavity resonant wavelength in our hybrid structured PCQWID, defined as
Summary
The detector’s extinction ratio reaches 65 at the wavelength of 14.7 mm, about 6 times enhanced in such a type of pixel-level polarization long wave infrared photodetectors. For fast moving objects or field measurements, recent developments involve micro-polarizers that are directly integrated into the structure of individual detecting pixels to form polarization detecting focal plane arrays (FPAs) so that real-time fast polarimetric imaging are very much facilitated to sustain the applications in, for example, air- or satellite-born remote sensing. TE light will have different resonant wavelength and will be weakly coupled It will have the electrical components in y direction, which is forbidden for the inter-subband transition by the quantum selection rule[14]. The inter-subband transition in QW induces photocurrents in the biased PCQWID, with which we obtain high contrast responses to TM and TE light
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