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Directional terahertz beams realized by depth-modulated metallic surface grating structures |
JOSA B, Vol. 28, Issue 11, pp. 2674-2679 (2011)
http://dx.doi.org/10.1364/JOSAB.28.002674
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Abstract
We propose a subwavelength metal slit with surrounding depth-modulated surface grating structures to realize directional beams in the terahertz regime. The surface gratings consist of two sets of grooves of different depths. The shallow grooves are designed to support the spoof surface plasmons, and the deep grooves are utilized to diffract the terahertz surface wave into free space. Theoretical analysis and numerical simulations based on the finite element method confirm that various beaming effects including splitting, on-axis beaming, and off-axis beaming can be realized by controlling the distributions of the deep grooves.
© 2011 Optical Society of America
OCIS Codes
(050.0050) Diffraction and gratings : Diffraction and gratings
(240.6690) Optics at surfaces : Surface waves
(050.6624) Diffraction and gratings : Subwavelength structures
ToC Category:
Optics at Surfaces
History
Original Manuscript: April 12, 2011
Revised Manuscript: August 3, 2011
Manuscript Accepted: September 1, 2011
Published: October 13, 2011
Citation
Yinghao Yuan, Jinsong Liu, Jian He, and Jianquan Yao, "Directional terahertz beams realized by depth-modulated metallic surface grating structures," J. Opt. Soc. Am. B 28, 2674-2679 (2011)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-28-11-2674
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