Abstract

A structure for surface-plasmon-polariton mediated directional off-axis beaming with a dynamic tunability of radiation direction is proposed. The key finding in this Letter is that properly designed metal–dielectric composite grating structures surrounding subwavelength metal slit produce a dynamically tunable off-axis beaming effect with variation of the grating permittivity value. The controllability of beam direction by the grating permittivity value opens a way to develop active plasmonic devices based on the beaming effect.

© 2009 Optical Society of America

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References

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  1. H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings (Springer, 1988).
  2. E. Ozbay, Science 311, 189 (2006).
    [CrossRef] [PubMed]
  3. H. J. Lezec, A. Degiron, E. Devaux, R. A. Linke, L. Martin-Moreno, F. J. Garcia-Vidal, and T. W. Ebbesen, Science 297, 820 (2002).
    [CrossRef] [PubMed]
  4. S. Kim, H. Kim, Y. Lim, and B. Lee, Appl. Phys. Lett. 90, 051113 (2007).
    [CrossRef]
  5. H. Kim, I.-M. Lee, and B. Lee, J. Opt. Soc. Am. A 24, 2313 (2007).
    [CrossRef]

2007

S. Kim, H. Kim, Y. Lim, and B. Lee, Appl. Phys. Lett. 90, 051113 (2007).
[CrossRef]

H. Kim, I.-M. Lee, and B. Lee, J. Opt. Soc. Am. A 24, 2313 (2007).
[CrossRef]

2006

E. Ozbay, Science 311, 189 (2006).
[CrossRef] [PubMed]

2002

H. J. Lezec, A. Degiron, E. Devaux, R. A. Linke, L. Martin-Moreno, F. J. Garcia-Vidal, and T. W. Ebbesen, Science 297, 820 (2002).
[CrossRef] [PubMed]

Degiron, A.

H. J. Lezec, A. Degiron, E. Devaux, R. A. Linke, L. Martin-Moreno, F. J. Garcia-Vidal, and T. W. Ebbesen, Science 297, 820 (2002).
[CrossRef] [PubMed]

Devaux, E.

H. J. Lezec, A. Degiron, E. Devaux, R. A. Linke, L. Martin-Moreno, F. J. Garcia-Vidal, and T. W. Ebbesen, Science 297, 820 (2002).
[CrossRef] [PubMed]

Ebbesen, T. W.

H. J. Lezec, A. Degiron, E. Devaux, R. A. Linke, L. Martin-Moreno, F. J. Garcia-Vidal, and T. W. Ebbesen, Science 297, 820 (2002).
[CrossRef] [PubMed]

Garcia-Vidal, F. J.

H. J. Lezec, A. Degiron, E. Devaux, R. A. Linke, L. Martin-Moreno, F. J. Garcia-Vidal, and T. W. Ebbesen, Science 297, 820 (2002).
[CrossRef] [PubMed]

Kim, H.

S. Kim, H. Kim, Y. Lim, and B. Lee, Appl. Phys. Lett. 90, 051113 (2007).
[CrossRef]

H. Kim, I.-M. Lee, and B. Lee, J. Opt. Soc. Am. A 24, 2313 (2007).
[CrossRef]

Kim, S.

S. Kim, H. Kim, Y. Lim, and B. Lee, Appl. Phys. Lett. 90, 051113 (2007).
[CrossRef]

Lee, B.

S. Kim, H. Kim, Y. Lim, and B. Lee, Appl. Phys. Lett. 90, 051113 (2007).
[CrossRef]

H. Kim, I.-M. Lee, and B. Lee, J. Opt. Soc. Am. A 24, 2313 (2007).
[CrossRef]

Lee, I.-M.

Lezec, H. J.

H. J. Lezec, A. Degiron, E. Devaux, R. A. Linke, L. Martin-Moreno, F. J. Garcia-Vidal, and T. W. Ebbesen, Science 297, 820 (2002).
[CrossRef] [PubMed]

Lim, Y.

S. Kim, H. Kim, Y. Lim, and B. Lee, Appl. Phys. Lett. 90, 051113 (2007).
[CrossRef]

Linke, R. A.

H. J. Lezec, A. Degiron, E. Devaux, R. A. Linke, L. Martin-Moreno, F. J. Garcia-Vidal, and T. W. Ebbesen, Science 297, 820 (2002).
[CrossRef] [PubMed]

Martin-Moreno, L.

H. J. Lezec, A. Degiron, E. Devaux, R. A. Linke, L. Martin-Moreno, F. J. Garcia-Vidal, and T. W. Ebbesen, Science 297, 820 (2002).
[CrossRef] [PubMed]

Ozbay, E.

E. Ozbay, Science 311, 189 (2006).
[CrossRef] [PubMed]

Raether, H.

H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings (Springer, 1988).

Appl. Phys. Lett.

S. Kim, H. Kim, Y. Lim, and B. Lee, Appl. Phys. Lett. 90, 051113 (2007).
[CrossRef]

J. Opt. Soc. Am. A

Science

E. Ozbay, Science 311, 189 (2006).
[CrossRef] [PubMed]

H. J. Lezec, A. Degiron, E. Devaux, R. A. Linke, L. Martin-Moreno, F. J. Garcia-Vidal, and T. W. Ebbesen, Science 297, 820 (2002).
[CrossRef] [PubMed]

Other

H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings (Springer, 1988).

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Figures (4)

Fig. 1
Fig. 1

(a) Subwavelength metal slit with a double-side metal–dielectric composite surface grating with period p, the left and right permittivity values of ϵ L and ϵ R , and the offset of h s ; (b) subwavelength metal slit with a single-side metal–dielectric composite surface grating with the same structural parameters.

Fig. 2
Fig. 2

Diffraction-field distributions generated by the subwavelength metal slits with the single right-side surface gratings for the grating permittivity values of (a) ϵ R = 1.0 , (b) ϵ R = 2.0 , (c) ϵ R = 4.0 , and (d) ϵ R = 5.0 .

Fig. 3
Fig. 3

Permittivity value ϵ R as a function of the radiation angle θ for the subwavelength metal slits with the single-side surface grating.

Fig. 4
Fig. 4

Diffraction field distributions generated by the subwavelength metal slits with the double-side surface gratings for the left- and right-grating permittivity pairs of (a) ( ϵ R , ϵ L ) = ( 1.0 , 4.8 ) , (b) ( ϵ R , ϵ L ) = ( 1.6 , 4.4 ) , (c) ( ϵ R , ϵ L ) = ( 2.0 , 3.5 ) , and (d) ( ϵ R , ϵ L ) = ( 2.6 , 2.6 ) . The notations AA , BB , CC , and DD indicate the corresponding points of ( ϵ R , ϵ L ) in the curve of Fig. 3 for the respective cases.

Equations (3)

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k diff , x L = real ( k SPP L ) 2 π p ,
k diff , x R = real ( k SPP R ) + 2 π p ,
k diff , x L = k diff , x R real [ k SPP L ( ϵ L ) ] 2 π p = real [ k SPP R ( ϵ R ) ] + 2 π p .

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