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Metal cavities composed of metal gratings, layered semiconductor structures, and bottom metal layers are proposed as light couplers for terahertz quantum-well photodetectors (QWPs). Due to a strong waveguide effect, the coupling properties of the metal cavities are significantly changed in comparison with the case of metal-grating-coupled terahertz QWPs. Numerical calculations show that there are...
Extended Interaction Klystrons have been demonstrated at frequencies up to 218 GHz CW and 229 GHz pulsed. Modern design, fabrication, and measurement technologies show promise of extending their operation into the THz regime. This paper describes the challenges and some novel approaches to the development of EIKs operating at 670, 850 and 1030 GHz, while simultaneously meeting demanding requirements...
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