DocumentCode :
1118476
Title :
Generation and Detection of THz Radiation With Scalable Antennas Based on GaAs Substrates With Different Carrier Lifetimes
Author :
Winnerl, Stephan ; Peter, Falk ; Nitsche, Sven ; Dreyhaupt, André ; Zimmermann, Burkhard ; Wagner, Martin ; Schneider, Harald ; Helm, Manfred ; Köhler, Klaus
Author_Institution :
Inst. of Ion Beam Phys. & Mater. Res., Dresden
Volume :
14
Issue :
2
fYear :
2008
Firstpage :
449
Lastpage :
457
Abstract :
We report on scalable photoconductive antennas for both emission and detection of terahertz (THz) radiation. The concept yields THz emitters with high efficiencies for the conversion of near-infrared into far-infrared radiation, and provides detectors that do not require tight focusing of both the THz beam and the near-infrared gating beam. GaAs substrates implanted with dual energy implants of N+ and As+ ions of various doses are compared with semiinsulating (SI) and low-temperature-grown GaAs. We discuss which material properties are desirable for emitters and detectors and identify which material is optimal as either emitter or detector substrate. Best results for detectors are found for implanted samples with doses in the range of 1013 cm-2 for GaAs:N and for LT-GaAs. Best emitters for typical excitation conditions with a Ti: sapphire oscillator system are based on SI-GaAs.
Keywords :
III-V semiconductors; carrier lifetime; gallium arsenide; photoconducting materials; submillimetre wave antennas; submillimetre wave detectors; submillimetre wave generation; Al2O3:Ti; GaAs; carrier lifetime; far-infrared radiation radiation; material property; near-infrared radiation; oscillator system; scalable antenna; scalable photoconductive antenna; terahertz wave detection; terahertz wave generation; terahertz wave radiation; Charge carrier lifetime; Crystals; Dipole antennas; Gallium arsenide; Optical pulses; Oscillators; Photoconducting materials; Photoconductivity; Radiation detectors; Spectroscopy; Ion implantation; photoconductive antenna; terahertz;
fLanguage :
English
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
Publisher :
ieee
ISSN :
1077-260X
Type :
jour
DOI :
10.1109/JSTQE.2007.910104
Filename :
4481137
Link To Document :
بازگشت