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 (2)

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 (1)

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

2002 (1)

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. (1)

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

J. Opt. Soc. Am. A (1)

Science (2)

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 (1)

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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