Dependence of emission of terahertz radiation on geometrical parameters of dipole photoconductive antennas

The dependence of the emission spectrum of terahertz (THz) radiation on the geometrical parameters of the dipole antenna, and the relationship between these parameters and the temporal characteristics of the transient current that generate THz radiation, is reported. The emission intensity and the peak frequency strongly depend on these geometrical parameters. This dependence varies significantly with changes in the temporal characteristics of the transient current. We have also found that the emission efficiency can be increased by increasing the aspect ratio for the dipole.

[1]  Michael Nagel,et al.  Characterization of low temperature GaAs antenna array terahertz emitters , 2007 .

[2]  Hans L. Hartnagel,et al.  Tunable CW-THz system with a log-periodic photoconductive emitter , 2004 .

[3]  Ryo Hattori,et al.  Polarization modulation of terahertz electromagnetic radiation by four-contact photoconductive antenna. , 2006, Optics express.

[4]  Paul Harrison,et al.  Terahertz sources and systems , 2001 .

[5]  C. M. Mann.  Towards Terahertz Communications Systems , 2001 .

[6]  M. Tani,et al.  Emission characteristics of photoconductive antennas based on low-temperature-grown GaAs and semi-insulating GaAs. , 1997, Applied optics.

[7]  M. Tani,et al.  Noninvasive Inspection of C-4 Explosive in Mails by Terahertz Time-Domain Spectroscopy , 2004 .

[8]  K. Siebert,et al.  Continuous-wave all-optoelectronic terahertz imaging , 2002 .

[9]  J. Coutaz,et al.  Analytical modeling and optimization of terahertz time-domain spectroscopy experiments, using photoswitches as antennas , 2001 .

[10]  M. Nuss,et al.  Subpicosecond photoconducting dipole antennas , 1988 .

[11]  Masahiko Tani,et al.  Vector analysis of terahertz transients generated by photoconductive antennas in near- and far-field regimes , 2003 .

[12]  Masanori Hangyo,et al.  Spectroscopy by pulsed terahertz radiation , 2002 .

[13]  D. Grischkowsky,et al.  High‐brightness terahertz beams characterized with an ultrafast detector , 1989 .

[14]  Masayoshi Tonouchi,et al.  Cutting-edge terahertz technology , 2007 .

[15]  G. Bastiaans,et al.  Detection and identification of explosive RDX by THz diffuse reflection spectroscopy. , 2006, Optics express.

[16]  Cunlin Zhang,et al.  Compact continuous-wave subterahertz system for inspection applications , 2005 .

[17]  C. Otani,et al.  Terahertz imaging diagnostics of the cancer tissues with chemometrics technique , 2007, 2006 Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics.

[18]  K. Cheung,et al.  Picosecond photoconducting Hertzian dipoles , 1984 .

[19]  Chiko Otani,et al.  Terahertz pulsed imaging of frozen biological tissues , 2009, 2009 34th International Conference on Infrared, Millimeter, and Terahertz Waves.