Fig. 1. (Color online) (a) The schematic illustration of ReS₂ crystal structure. (b) OM image of the as-fabricated device with the scale bar of 50 μm. (c) AFM image of the ReS₂ nanobelt. Inset: the height profile along the blue line. The scale bar is 1 μm. (d) SEM image of ReS₂ nanobelt. The scale bar is 1 μm. (e) The schematics of the device configuration and measurement setup. (f) The current−voltage curves of the ReS₂ nanobelt device under dark condition and under 7.8 μW/cm² illumination with a wavelength of 665 nm. The polarization direction is 0 degree, which is along b-axis of nanobelt marked by the white arrow in (b). The inset shows the local enlarged curves.

Fig. 2. (Color online) (a) Spectral response of our device at different biases. (b) Time-dependent photocurrent response at different biases illuminated by a 7.8 μW/cm², 665 nm light. (c) Light power density dependent photocurrent and responsivity at 0.5 V bias. (d) Photoresponse versus modulation frequency of the device. (e) Noise power density spectrum of the device. (f) Estimated detectivity (D*) spectrum at 0.5 V bias.

Fig. 3. (Color online) (a) The polar plot of the photocurrent under 0.5 V bias versus the polarization angle. The incident light power is 7.8 μW/cm². (b) The photocurrent under 0.5 V bias versus the quarter-wave plate angle (black curves). The extracted CPGE (red curves) show the current components under CP light illumination. (c) and (d) Measured photocurrent under incident light with different polarization states when the rotation angles of the device are 0°, 45°, 90°, 135°, and 180°. The incident light is tuned at 665 nm with a power density of 7.8 μW/cm². (e) The average measurement errors of our device.

Fig. 4. (Color online) The average measurement errors of the Stokes parameters, S₁, S₂, and S₃ based on our ReS₂ nanobelt full-Stokes polarimeter under irradiation with different wavelength (a) and light power density (b).