Chapter 3 . High - Frequency ( > 100 GHz ) Electronic Devices

Professor Hu's laboratory is equipped with various millimeter-wave and infrared sources which can generate coherent and incoherent radiation up to 30 THz. These include Gunn oscillators at W-band frequencies (75-110 GHz); a frequency doubler, tripler, and quadrupler using Schottky diodes at 200, 300, and 400 GHz; an optically pumped farinfrared laser which generates coherent radiation up to 8 THz; and an infrared Fourier transform spectrometer which is capable of performing linear spectroscopy from 45 GHz to 30 THz and beyond. The laboratory is also equipped with various cryogenic millimeter-wave and infrared detectors. These include Si composite bolometers, InSb hotelectron bolometers, SIS (superconductor-insulatorsuperconductor) receivers, and high-To Josephson detectors. There are many infrared cryostats which can cool the devices from 0.3 K to 77 K.