The blackbody source is HFY-206A without a focusing lens. The device was placed 15 cm away from the aperture with a fixed modulation frequency of 1000 Hz chopped by an optical chopper wheel. An 800-nm to 2.7-μm bandpass polarizer and a 1-μm high-pass half-wave plate are placed in front of the device for blackbody polarization measurements. The total incident power on the device surface can be calculated by the approximation formula P=αεσ(Ts4T04)AR2L2, where α is the modulation factor, ε is the average emissivity of the blackbody source, ε is 0.9 for our blackbody source, σ is the Stefan-Boltzmann constant. Ts and T0 are the temperature of the blackbody radiation source and the room temperature (300 K), respectively. A is the device area in units of square centimeters. R is the aperture radius of the blackbody radiation source, and L is the distance between the aperture and sample in units of centimeters.

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