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Active and Passive Electronic Components
Volume 2007 (2007), Article ID 40249, 8 pages
http://dx.doi.org/10.1155/2007/40249
Review Article

Resonant Excitation of Terahertz Surface Plasmons in Subwavelength Metal Holes

1School of Electrical and Computer Engineering, Oklahoma State University, Stillwater 74078-5032, OK, USA
2MPA-CINT, Los Alamos National Laboratory, P. O. Box 1663, MS K771, Los Alamos 87545, NM, USA
3Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117542

Received 27 September 2007; Accepted 12 October 2007

Academic Editor: Yalin Lu

Copyright © 2007 Weili Zhang 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.

Abstract

We present a review of experimental studies of resonant excitation of terahertz surface plasmons in two-dimensional arrays of subwavelength metal holes. Resonant transmission efficiency higher than unity was recently achieved when normalized to the area occupied by the holes. The effects of hole shape, hole dimensions, dielectric function of metals, polarization dependence, and array film thickness on resonant terahertz transmission in metal arrays were investigated by the state-of-the-art terahertz time-domain spectroscopy. In particular, extraordinary terahertz transmission was demonstrated in arrays of subwavelength holes made even from Pb, a generally poor metal, and having thickness of only one-third of skin depth. Terahertz surface plasmons have potential applications in terahertz imaging, biosensing, interconnects, and development of integrated plasmonic components for terahertz generation and detection.