Fig. 4: Polarization imaging applications for Te nanoflake device.
From: Stable mid-infrared polarization imaging based on quasi-2D tellurium at room temperature
a Schematic of the imaging target, with a scattering media above the target. The inset is the schematic of the text pattern HUST and SITP. b Schematic of the polarization imaging mechanism for the calculation of DoLP. c Imaging DoLP results for the nonpolarized 2H-MoTe2 device under 1.55 μm illumination for comparison. The illumination power is fixed at 1.0 mW. The DoLP is almost 0, indicating that MoTe2 device shows no polarization detection ability, which is not applicable for polarized imaging under scattering environments. d, e Imaging DoLP results for the Te device under 1.55 and 2.3 μm illumination, respectively. The imaging contrast is strong for the target due to its intrinsic excellent polarization detection ability. Scale bars in (c)–(e), 1 mm. f Normalized imaging contrast of S0 and DoLP. For MoTe2, the contrast becomes lower due to its isotropic photoresponse along any direction, and for Te device, the contrast is higher after calculating DoLP, and DoLP enhancement under 2.3 μm illumination is higher than 1.55 μm illumination due to stronger absorption anisotropy.
