Terahertz time-domain spectroscopy and material dynamics
Averitt, Richard D. Physics Department, Boston University, Boston, Massachusetts.
- Development of terahertz technology
- Experimental setup
- Generation and detection of terahertz pulses
- Nonequilibrium dynamics studies
- Links to Primary Literature
- Additional Readings
The terahertz region of the electromagnetic spectrum corresponds to frequencies above the microwave and below the infrared (Fig. 1a). This region, alternately termed the far-infrared, spans approximately the frequency range 0.1–30 THz, where 1 terahertz (THz) is 1012 Hz, corresponding to a free-space wavelength of 300 μm, a photon energy of 0.004 eV, and a temperature of 47 K. For comparison, microwave ovens operate at approximately 2.5 gigahertz (1 THz = 1000 GHz), and the cosmic microwave background at 2.7 K corresponds to a frequency of approximately 60 GHz. When the universe was approximately 3 × 109 years old, the background radiation in the universe would have been centered at approximately 1 THz.
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