Fig. 1. Architecture of the detector

Fig. 2. Equivalent circuit of the detector

Fig. 3. Source input impedances of the NMOS transistor versus frequency

Fig. 4. Schematic diagram of the antenna structure

Fig. 5. Impedance magnitude of TL as a function of frequency

Fig. 6. Z_ANTwith (a) and without (b) IMN, respectively

Fig. 7. Fig.7(a) Calculated relative R_v of the detector based on the simulation results; (b) Radiation efficiency of the antenna

Fig. 8. Chip micrograph

Fig. 9. Detector responsivity measurement set-up

Fig. 10. (a) Measured R_v (purple) and simulated R_v (gray) at different source frequencies; (b) Measured NEP at different source frequencies

Fig. 11. Measured R_v and NEP of the detector as functions of the gate bias voltage at 281 GHz

Fig. 12. Terahertz scanning imaging system. (a) Structure diagram; (b) Physical diagram

Fig. 13. Imaging of three different cards illuminated by a source at 281 GHz