Time behavior of field screening effects in small-size GaAs photoconductive terahertz antenna

Tianyi WANG, Zhengang YANG, Si ZOU, Kejia WANG, Shenglie WANG, Jinsong LIU

PDF(793 KB)
PDF(793 KB)
Front. Optoelectron. ›› 2015, Vol. 8 ›› Issue (1) : 98-103. DOI: 10.1007/s12200-015-0488-9
RESEARCH ARTICLE

Time behavior of field screening effects in small-size GaAs photoconductive terahertz antenna

Author information +
History +

Abstract

The field screening effects in small-size GaAs photoconductive (PC) antenna are investigated via the well-known pump and probe terahertz (THz) generation technique. The peak amplitude of the THz pulses excited by the probe laser pulse as a function of the pump-probe time delay was measured. An equivalent-circuit model was used to simulate the experimental data. Based on the good agreement between the results of simulation and experiment, the time behavior of the radiation and space-charge fields was simulated. The results show that the space-charge screening dominantly determines the device response in the whole time, while the radiation filed screening plays a key role in initial time which strongly affects the peak THz field. The parameter analysis was performed, which may be valuable on the optimum design for the antenna as a THz emitter.

Keywords

GaAs photoconductive (PC) antenna / field screening effects / terahertz (THz) emitter

Cite this article

Download citation ▾
Tianyi WANG, Zhengang YANG, Si ZOU, Kejia WANG, Shenglie WANG, Jinsong LIU. Time behavior of field screening effects in small-size GaAs photoconductive terahertz antenna. Front. Optoelectron., 2015, 8(1): 98‒103 https://doi.org/10.1007/s12200-015-0488-9

References

[1]
Auston D H, Cheung K P, Smith P R. Picosecond photoconducting Hertzian dipoles. Applied Physics Letters, 1984, 45(3): 284–286
CrossRef Google scholar
[2]
Katzenellenbogen N, Grischkowsky D. Efficient generation of 380 fs pulses of THz radiation by ultrafast laser pulse excitation of a biased metal-semiconductor interface. Applied Physics Letters, 1991, 58(3): 222–224
CrossRef Google scholar
[3]
Tonouchi M, Kawasaki N, Yoshimura T, Wald H, Seidel P. Pump and probe terahertz generation study of ultrafast carrier dynamics in low-temperature grown-GaAs. Japanese Journal of Applied Physics, 2002, 41(Part 2, No. 6B): L706–L709
CrossRef Google scholar
[4]
Siebert K J, Lisauskas A, Löffler T, Roskos H. Field screening in low-temperature-grown GaAs photoconductive antennas. Japanese Journal of Applied Physics, 2004, 43(3): 1038–1043
CrossRef Google scholar
[5]
Yano R, Gotoh H, Hirayama Y, Miyashita S. Systematic pump-probe terahertz wave emission spectroscopy of a photoconductive antenna fabricated on low-temperature grown GaAs. Journal of Applied Physics, 2004, 96(7): 3635–3638
CrossRef Google scholar
[6]
Loata G C, Thomson M D, Löffler T, Poskos H C. Radiation field screening in photoconductive antennae studied via pulsed terahertz emission spectroscopy. Applied Physics Letters, 2007, 91(23): 232506-1–232506-3
[7]
Pedersen J E, Lyssenko V G, Hvam J M, Jepsen P U, Keiding S R, So̸rensen C B, ̸Lindelof P E. Ultrafast local field dynamics in photoconductive THz antennas. Applied Physics Letters, 1993, 62(11): 1265–1267
CrossRef Google scholar
[8]
Jacobsen R H, Birkelund K, Holst T, Jepsen P U, Keiding S R. Interpretation of photocurrent correlation measurements used for ultrafast photoconductive switch characterization. Journal of Applied Physics, 1996, 79(5): 2649–2657
CrossRef Google scholar
[9]
Jepsen P U, Jacobsen R H, Keiding S R. Generation and detection of terahertz pulses from biased semiconductor antennas. Journal of the Optical Society of America B, Optical Physics, 1996, 13(11): 2424–2436
CrossRef Google scholar
[10]
Loata G C. Investigation of low-temperature-grown GaAs photoconductive antennae for continuous-wave and pulsed terahertz generation. Dissertation for the Doctoral Degree. Frankfurt: Universitätsbibliothek Frankfurt am Main, 2007

Acknowledgements

This research was supported by the Wuhan Applied Basic Research Project (No. 20140101010009), the National Natural Science Foundation of China (Grant Nos. 61177095, 61475054 and 61405063), Hubei Natural Science Foundation ( Nos. 2012FFA074 and 2013BAA002), and the Fundamental Research Funds for the Central Universities, HUST (Nos. 2014ZZGH021, 2014QN023, CXY13Q015, CX14-070 and CXY13M009).

RIGHTS & PERMISSIONS

2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
AI Summary AI Mindmap
PDF(793 KB)

Accesses

Citations

Detail

Sections
Recommended

/