volume | PIER Journals

Abstract

We study the rectangular tips of the dipole photoconductive antenna, which has been widely used for terahertz radiation and detection, with different blend radii effect on the emission performance of terahertz (THz) radiation. For the amplitude of THz radiation pulse is proportional to the local electric field in the gap, the increased maximum bias electric field by blending tips is able to achieve higher THz radiation power. Both considering the influence to the maximum bias electric field and the emission efficiency, the blend radius of the rectangular tips is suggest to be larger than 5 μm and the radiation power is largely enhanced. Comparing to the previous work, our method has better THz radiation performance.

1. Kado, Y. and T. Nagatsuma, "Exploring sub-THz waves for communications, imaging, and gas sensing," PIERS Proceedings, 42-47, Beijing, China, March 23-27, 2009.

2. Ogawa, Y., S. Hayashi, C. Otani, and K. Kawase, "Terahertz sensing for ensuring the safety and security," PIERS Online, Vol. 4, No. 3, 396-400, 2008.
doi:10.2529/PIERS070831051620

3. Hoshina , H., A. Hayashi, N. Miyoshi, F. Miyamaru, and C. Otani, "Terahertz pulsed imaging of frozen biological tissues," Appl. Phys. Lett., Vol. 94, 123901, March 2009.
doi:10.1063/1.3106616

4. Doi, Y., S. Hirooka, A. Sato, M. Kawada, H. Shibai, Y. Okamura, S. Makiuti, T. Nakagawa, N. Hiromoto, and M. Fujiwara, "Large-format and compact stressed Ge: Ga array for the ASTRO-F (IRIS) mission," Adv. Space. Res., Vol. 30, No. 9, 2099-2104, November 2002.
doi:10.1016/S0273-1177(02)00594-X

5. Padilla, W. J., A. J. Taylor, C. Highstrete, M. Lee, and R. D. Averitt, "Dynamical electric and magnetic metamaterial response at terahertz frequencies," Phys. Rev. Lett., Vol. 96, No. 10, 7401, March 2006.
doi:10.1103/PhysRevLett.96.107401

6. Van Exter, , M., C. Fattinger, and D. Grischkowsky, "High-brightness terahertz beams characterized with an ultrafast detector," Appl. Phys. Lett., Vol. 55, No. 4, 337-339, May 1989.
doi:10.1063/1.101901

7. Tani, M., S. Matsuura, K. Sakai, and S. Nakashima, "Emission characteristics of photoconductive antennas based on low-temperature-grown GaAs and semi-insulating GaAs," Appl. Opt. , Vol. 36, No. 30, 7853-7859, October 1997.
doi:10.1364/AO.36.007853

8. Cai, Y., I. Brener, J. Lopata, J. Wynn, L. Pfeiffer, and J. Federici, "Design and performance of singular electric field terahertz photoconducting antennas," Appl. Phys. Lett., Vol. 71, No. 15, 2076-2078, August 1997.
doi:10.1063/1.119346

9. Mendis, R., C. Sydlo, J. Sigmund, M. Feiginov, P. Meissner, and H. L. Hartnagel, "Tunable CW-THz system with a log-periodic photocondutive antenna emitter," Solid-State Electron., Vol. 48, No. 10-11, 2041-2045, March 2004.
doi:10.1016/j.sse.2004.05.055

10. Awad, M., M. Nagel, H. Kurz, J. Herfort, and K. Ploog, "Characterization of low temperature GaAs antenna array terahertz emitters," Appl. Phys. Lett., Vol. 91, 181124, November 2007.
doi:10.1063/1.2800885

11. Miyamaru, F., Y. Saito, K. Yamamoto, T. Furuya, S. Nishizawa, and M. Tani, "Dependence of emission of terahertz radiation on geometrical parameters of dipole photoconductive antennas," Appl. Phys. Lett., Vol. 96, 211104, May 2010.
doi:10.1063/1.3436724

12. Maraghechi, P. A. Y. Elezzabi, "Enhanced THz radiation emission from plasmonic complementary Sierpinski fractal emitters," Opt. Express, Vol. 18, No. 26, 27336, December 2010.
doi:10.1364/OE.18.027336

13. Zhong , S., Y.-C. Shen, H. Shen, Y. Huang, "FDTD study of a novel terahertz emitter with electrical field enhancement using surface plasmon resonance," PIERS Online, Vol. 6, No. 2, 153-156, 2010.
doi:10.2529/PIERS090906095006

14. Darrow, J. T., X.-C. Zhang, D. H. Auston, and J. D. Morse, "Saturation properties of large-aperture photoconducting antennas," IEEE J. Quantum Electron., Vol. 28, No. 6, 1607-1616, June 1992.
doi:10.1109/3.135314

15. Ferguson , B. and X.-C. Zhang, "Materials for terahertz science and technology," Nat. Mater., Vol. 1, 26-33, September 2002.
doi:10.1038/nmat708

16. Yang, J., W. Fan, and B. Xue, "Biased electric field analysis of a photoconductive antenna for terahertz generation," Nucl. Instr. and Meth. A, Vol. 637, No. 1, S165-S167, May 2011.
doi:10.1016/j.nima.2010.02.048

17. Duvillaret, L., F. Garet, J.-F. Roux, and J.-L. Coutaz, "Analytical modeling and optimization of terahertz time-domain spectroscopy experiments using photoswitches as antennas," IEEE J. Sel. Top. Quantum Electron., Vol. 7, No. 4, 615-623, July/August 2001.

18. Uhd Jepsen , P., R. H. Jacobsen, and S. R. Keiding, "Generation and detection of terahertz pulses from biased semiconductor antennas," J. Opt. Soc. Am. B, Vol. 13, No. 11, 2424-2436, November 1996.
doi:10.1364/JOSAB.13.002424

Dr. Junming Diao

Professor Feng Yang

Dr. Lin Du

Dr. Jun Ou Yang

Professor Peng Yang