Abstract
Terahertz radiation occupies a large portion of the electromagnetic spectrum between the infrared and microwave bands from 0.1 to 10 THz. This frequency range presents the next frontier in imaging science and technology. Compared to the relatively well-developed imaging techniques at microwave and optical frequencies, however, basic research, new initiatives, and advanced technology developments in the terahertz band are very limited. The “THz gap” is a scientifically rich but technologically limited frequency band-largely because efficient terahertz emitters and receivers are a relatively recent invention. This chapter provides the fundamentals of free-space electro-optic technology for generation and detection of terahertz pulses. The free-space THz optoelectronic detection system, which uses photoconductive antennas or electro-optic crystals, provides diffraction-limited spatial resolution, femtosecond temporal resolution, DC-THz spectral bandwidth and mV/cm field sensitivity.
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Jiang, Z., Zhang, XC. (2003). Free-Space Electro-Optic Techniques. In: Mittleman, D. (eds) Sensing with Terahertz Radiation. Springer Series in Optical Sciences, vol 85. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-45601-8_4
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