Figure 1
From: 6.2-GHz modulated terahertz light detection using fast terahertz quantum well photodetectors
Experimental setup of the fast terahertz detection using a microwave transmission line equipped terahertz QWP. The modulated terahertz light is generated from a 6-mm long cavity terahertz QCL working in continuous wave mode. Two off-axis parabolic (OAP) mirrors are used for light collection and collimation. The lower left inset shows the two-dimensional focused beam pattern of the terahertz QCL measured using a terahertz imager. The upper right inset is the schematic of the terahertz light incident on the QWP chip. d is the diameter of the terahertz beam and \(\sqrt{2}d\) the side dimension of the QWP chip to ideally absorb the terahertz radiation. SMA: SubMiniature version A, BNC: Bayonet Neil Concelman.
