Polarization modulation of terahertz electromagnetic radiation by four-contact photoconductive antenna

Polarization modulation of terahertz electromagnetic radiation by four-contact photoconductive antenna

Generation and modulation of circularly polarized terahertz electromagnetic radiation have been demonstrated by using a four-contact photoconductive antenna and a total-reflection Si prism. The quality of the circularly polarized terahertz pulsed radiation has been evaluated by using a polarization...

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Veröffentlicht in:Optics express 2006-05, Vol.14 (10), p.4486-4493
Hauptverfasser: Hirota, Yuichi, Hattori, Ryo, Tani, Masahiko, Hangyo, Masanori
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creator Hirota, Yuichi
Hattori, Ryo
Tani, Masahiko
Hangyo, Masanori
description Generation and modulation of circularly polarized terahertz electromagnetic radiation have been demonstrated by using a four-contact photoconductive antenna and a total-reflection Si prism. The quality of the circularly polarized terahertz pulsed radiation has been evaluated by using a polarization sensitive terahertz time-domain spectroscopy system. The characteristic of the dynamic modulation between the left and right circularly polarized states of the THz radiation is also evaluated. The ellipticity of the modulated circularly polarized THz radiation without a polarizer is not as good as that of the non-modulated because of the non-uniform bias field distribution and the asymmetric pump laser intensity profile on the photoconductive gap.
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title Polarization modulation of terahertz electromagnetic radiation by four-contact photoconductive antenna
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