FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Polarization-Independent Directional Beaming of Light by a Subwavelength Metal Slit |
ZHANG Xiang, LI Cheng-Fang |
Department of Physics, Wuhan University, Wuhan 430072 |
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Cite this article: |
ZHANG Xiang, LI Cheng-Fang 2009 Chin. Phys. Lett. 26 114204 |
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Abstract We present the directional beaming effect of light at the terahertz frequency by using a subwavelength slit in the metal film. The metal is dressed with anisotropic dielectric so that both the transverse electric (TE) and transverse magnetic (TM) polarized waves can be well guided on the metal surface and reach the phase matching. By using a periodical array of dielectric ridges and grooves around the slit, the guided waves can be scattered out of the slit and interfere with the transmitted light directly through the slit. The results performed by finite-difference at time-domain computations indicate that the directional beaming of light can be obtained simultaneously for both the TE and TM polarized waves after optimizing the geometric parameters. The structure may find great applications in polarization-independent optical devices such as couplers, connectors, beam collimator, and etc.
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Keywords:
42.79.Ag
42.68.Mj
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Received: 01 April 2009
Published: 30 October 2009
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[1] Lezec H J, Degiron A, Devaux E, Linke R A,Martin-Moreno L, Garcia-Vidal F J and Ebbesen T W 2002 Science 297 820 [2] Lin D Z, Chang C K, Chen Y C, Yang D L, Lin M W, Yeh J T,Liu J M, Kuan C H, Yeh C S and Lee C K 2006 Opt. Express 14 3503 [3] Li Z B, Tian J G, Zhou W Y, Liu Z B, Zang W P and Zhang CP 2006 Chin. Phys. Lett. 23 1207 [4] Martin-Moreno L, Garcia-Vidal F J, Lezec H J,Degiron A and Ebbesen T W 2003 Phys. Rev. Lett. 90167401 [5] Yu L B, Lin D Z, Chen Y C, Chang Y C, Huang K T, Liaw J W,Yeh J T, Liu J M, Yeh C S and Lee C K 2005 Phys. Rev. B 71 41405 [6] Moreno E, Garcia-Vidal F J and Martin-Moreno L 2004 Phys. Rev. B 69 [7] Raether H 1988 Surface Plasmons on Smooth and RoughSurfaces and on Gratings (Berlin: Springer-Verlag) [8] Moreno E, Martin-Moreno L and Garcia-Vidal F J2006 J. Opt. A: Pure Appl. Opt. 8 S94 [9] Nikitin A Y, Garcia-Vidal F J and Martin-MorenoL 2009 Appl. Phys. Lett. 94 063119 [10] Zhang X and Li C 2009 Physica E 41 1445 [11] Barnes W L, Dereux A and Ebbesen T W 2003 Nature 424 824 [12] Stoyanov N S, Ward D W, Feurer T and Nelson K A 2002 Nature Mater. 1 95 [13] Saxler J, Rivas J G, Janke C, Pellemans H P M, Bolivar PH and Kurz H 2004 Phys. Rev. B 69 155427 [14] Seo M A, Park H R, Koo S M, Park D J, Kang J H, Suwal OK, Choi S S, Planken P C M, Park G S, Park N K, Park Q H and Kim D S2009 Nature Photonics 3 152 [15] Wang K and Mittleman D M 2004 Nature 432 376 [16] Taflove A and Hagness S C 2000 ComputationalElectrodynamics: The Finite-Difference Time-Domain Method (Boston:Artech House) [17] Lidorikis E, Povinelli M L, Johnson S G and JoannopoulosJ D 2003 Phys. Rev. Lett. 91 23902 [18] Ordal M A 1983 Appl. Opt. 22 1099 [19] Kong J A 1975 Theory of Electromagnetic Waves (NewYork: Wiley-Interscience) [20] Li Z Y, Gu B Y and Yang G Z 1998 Phys. Rev. Lett. 81 2574 |
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