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Semiconductor materials for optoelectronic THz systems activated by long-wavelength lasers
Semiconductor materials that can be used for manufacturing THz emitters and THz detectors for pulsed optoelectronic terahertz time-domain spectroscopy systems activated by femtosecond lasers of the infrared wavelength range are reviewed. THz emission from unbiased surfaces of various semiconductors has been investigated and analyzed; it was shown that the best emitter is p-type InAs crystal. Optoelectronic THz detectors were manufactured from several semiconducting materials that are meeting the requirements for such devices such as sub-picosecond electron lifetime, high electron mobility, and large dark resistivity. The best results were achieved when using low-temperature-grown GaBiAs epitaxial layers. Characteristics of THz optoelectronic system employing GaBiAs detector (the frequency bandwidth of 5 THz and the dynamical range of 60 dB) were comparable to those systems based on the Ti:sapphire lasers and GaAs photoconducting antennae.
Semiconductor materials for optoelectronic THz systems activated by long-wavelength lasers
Semiconductor materials that can be used for manufacturing THz emitters and THz detectors for pulsed optoelectronic terahertz time-domain spectroscopy systems activated by femtosecond lasers of the infrared wavelength range are reviewed. THz emission from unbiased surfaces of various semiconductors has been investigated and analyzed; it was shown that the best emitter is p-type InAs crystal. Optoelectronic THz detectors were manufactured from several semiconducting materials that are meeting the requirements for such devices such as sub-picosecond electron lifetime, high electron mobility, and large dark resistivity. The best results were achieved when using low-temperature-grown GaBiAs epitaxial layers. Characteristics of THz optoelectronic system employing GaBiAs detector (the frequency bandwidth of 5 THz and the dynamical range of 60 dB) were comparable to those systems based on the Ti:sapphire lasers and GaAs photoconducting antennae.
Semiconductor materials for optoelectronic THz systems activated by long-wavelength lasers
Krotkus, A. (author) / Adomavicius, R. (author) / Pacebutas, V. (author)
2008-10-01
71465 byte
Conference paper
Electronic Resource
English
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