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Active and Passive Electronic Components
Volume 2007 (2007), Article ID 63139, 4 pages
Research Article

Transmission Properties of Metallic Grating with Subwavelength Slits in THz Frequency Region

1Center for THz waves, Ultrafast Laser Laboratory, College of Precision Instrument and Optoelectronics Engineering, and Key Laboratory of Opto-electronics Information and Technical Science (Ministry of Education), Tianjin University, Tianjin 300072, China
2School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, OK 74078, USA
3Physics Department and International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119992, Russia

Received 11 September 2007; Accepted 10 October 2007

Academic Editor: Yalin Lu

Copyright © 2007 Dong Liang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


This paper presents a fully experimental and theoretical study on transmission properties of a deep metallic grating with subwavelength slits in THz frequency region by using THz time domain spectroscopy (THz-TDS). The grating exposed to p-polarized incident wave exhibits enhanced nonresonant transmission in the long-wavelength region where the incident wavelength is larger than the grating period. Wood anomalies are observed when the wavelength is comparable to the grating period. Strict theory is given to explain the experimental results and the two are in good agreement. It is proposed that the Wood dips may be considered a criterion and a tool to judge and control the uniformity or fabricating accuracy of the grating period.