Fig. 1. (a) Structure diagram of 340 GHz focal plane detector chip single pixel; (b) Coordinate definition of Pixels in FPA; (c) Equivalent circuit diagram of CMOS ROIC

Fig. 2. Schematic diagram of the low temperature test system

Fig. 3. Diagram of electrical signal transmission links in the cryogenic terahertz FPA system

Fig. 4. Variation of SNR of pixel (31,31) with the applied voltage at 300 K and 77 K

Fig. 5. NEP ratio of each pixel at 77 K and 300 K

Fig. 6. Noise ratio of each pixel at 77 K and 300 K

Fig. 7. (a) Ratio of the responsivity of each pixel at 77 K and 300 K; (b) Average increase in responsivity of adjacent pixels at 77 K and 300 K