Figure 3
From: 6.2-GHz modulated terahertz light detection using fast terahertz quantum well photodetectors
Fast detection of terahertz light. (a) The emission spectrum of a 6-mm long terahertz QCL recorded in continuous wave mode at 15 K. The photoresponse spectrum of the terahertz QWP is shown for comparison. The reddish region shows the frequency range of the bottom X axis for the QCL measurement. (b) RF spectrum measured using the fast terahertz QWP. (c) RF spectrum recorded with the “Max hold” function of the spectrum analyser. The time duration for the “Max hold” measurement is 3 minutes.
