Figure 2
From: 6.2-GHz modulated terahertz light detection using fast terahertz quantum well photodetectors
Device characterizations of the terahertz QWP. (a) The dark current versus voltage characteristics of the 400 × 400 μm2 terahertz QWP measured at 5 K. (b) Photoresponse spectra of the QWP device at different bias voltages. The inset plots the measured peak responsivity as a function of voltage. (c) Experimental setup of the rectification measurement. R L represents the 50-Ω transmission line. The inset is the equivalent circuit of the QWP device for microwave modelling. (d) The rectifications at different microwave power as the QWP is biased at 120 mV. The dashed lines show the −3 dB levels for 0, 5, and 15 dBm power values.
