Abstract

We demonstrate that 100% transmission of a strongly localized channel plasmon polariton can be achieved through a sharp 90° bend in a subwavelength waveguide in the form of a triangular groove on a metal surface—a feature that has previously been demonstrated only for photonic crystal waveguides, which do not provide subwavelength localization. Conditions for minimum reflection and radiative losses at the bend are investigated numerically by the finite-difference time-domain algorithm. Dissipation in the structure is demonstrated to be sufficiently low to ensure significant propagation distances (a number of wavelengths) of the localized plasmon in each of the arms of the bend.

© 2005 Optical Society of America

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  1. J. R. Krenn, Nat. Mater. 2, 210 (2003).
    [CrossRef] [PubMed]
  2. J. Takahara, S. Yamagishi, H. Taki, A. Morimoto, and T. Kobayashi, Opt. Lett. 22, 475 (1997).
    [CrossRef] [PubMed]
  3. S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, Nat. Mater. 2, 229 (2003).
    [CrossRef] [PubMed]
  4. B. Lamprecht, J. R. Krenn, G. Schider, H. Ditlbacher, M. Salerno, N. Felidj, A. Leitner, and F. R. Aussenegg, Appl. Phys. Lett. 79, 51 (2001).
    [CrossRef]
  5. J.-C. Weeber, A. Dereux, C. Girard, J. R. Krenn, and J.-P. Goudonnet, Phys. Rev. B 60, 9061 (1999).
    [CrossRef]
  6. G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
    [CrossRef]
  7. J. R. Krenn, B. Lamprecht, H. Ditlbacher, G. Schider, M. Salerno, A. Leitner, and F. R. Aussenegg, Europhys. Lett. 60, 663 (2002).
    [CrossRef]
  8. T. Onuki, Y. Watanabe, K. Nishio, T. Tsuchiya, T. Tani, and T. Tokizaki, J. Microsc. 210, 284 (2003).
    [CrossRef] [PubMed]
  9. J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
    [CrossRef]
  10. S. A. Maier, M. L. Brongersma, and H. A. Atwater, Appl. Phys. Lett. 78, 16 (2001).
    [CrossRef]
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    [CrossRef]
  12. I. V. Novikov and A. A. Maradudin, Phys. Rev. B 66, 035403 (2002).
    [CrossRef]
  13. D. F. P. Pile and D. K. Gramotnev, Opt. Lett. 29, 1069 (2004).
    [CrossRef] [PubMed]
  14. D. K. Gramotnev and D. F. P. Pile, Appl. Phys. Lett. 85, 6323 (2004).
    [CrossRef]
  15. D. Christensen and D. Fowers, Biosens. Bioelectron. 11, 677 (1996).
    [CrossRef]
  16. G. Mur, IEEE Trans. Electromagn. Compat. 40, 100 (1998).
    [CrossRef]

2004

D. F. P. Pile and D. K. Gramotnev, Opt. Lett. 29, 1069 (2004).
[CrossRef] [PubMed]

D. K. Gramotnev and D. F. P. Pile, Appl. Phys. Lett. 85, 6323 (2004).
[CrossRef]

2003

K. Tanaka and M. Tanaka, Appl. Phys. Lett. 82, 1158 (2003).
[CrossRef]

J. R. Krenn, Nat. Mater. 2, 210 (2003).
[CrossRef] [PubMed]

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, Nat. Mater. 2, 229 (2003).
[CrossRef] [PubMed]

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

T. Onuki, Y. Watanabe, K. Nishio, T. Tsuchiya, T. Tani, and T. Tokizaki, J. Microsc. 210, 284 (2003).
[CrossRef] [PubMed]

2002

J. R. Krenn, B. Lamprecht, H. Ditlbacher, G. Schider, M. Salerno, A. Leitner, and F. R. Aussenegg, Europhys. Lett. 60, 663 (2002).
[CrossRef]

I. V. Novikov and A. A. Maradudin, Phys. Rev. B 66, 035403 (2002).
[CrossRef]

2001

S. A. Maier, M. L. Brongersma, and H. A. Atwater, Appl. Phys. Lett. 78, 16 (2001).
[CrossRef]

B. Lamprecht, J. R. Krenn, G. Schider, H. Ditlbacher, M. Salerno, N. Felidj, A. Leitner, and F. R. Aussenegg, Appl. Phys. Lett. 79, 51 (2001).
[CrossRef]

1999

J.-C. Weeber, A. Dereux, C. Girard, J. R. Krenn, and J.-P. Goudonnet, Phys. Rev. B 60, 9061 (1999).
[CrossRef]

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

1998

G. Mur, IEEE Trans. Electromagn. Compat. 40, 100 (1998).
[CrossRef]

1997

1996

D. Christensen and D. Fowers, Biosens. Bioelectron. 11, 677 (1996).
[CrossRef]

Atwater, H. A.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, Nat. Mater. 2, 229 (2003).
[CrossRef] [PubMed]

S. A. Maier, M. L. Brongersma, and H. A. Atwater, Appl. Phys. Lett. 78, 16 (2001).
[CrossRef]

Aussenegg, F. R.

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

J. R. Krenn, B. Lamprecht, H. Ditlbacher, G. Schider, M. Salerno, A. Leitner, and F. R. Aussenegg, Europhys. Lett. 60, 663 (2002).
[CrossRef]

B. Lamprecht, J. R. Krenn, G. Schider, H. Ditlbacher, M. Salerno, N. Felidj, A. Leitner, and F. R. Aussenegg, Appl. Phys. Lett. 79, 51 (2001).
[CrossRef]

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

Boreman, G.

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

Bourillot, E.

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

Brongersma, M. L.

S. A. Maier, M. L. Brongersma, and H. A. Atwater, Appl. Phys. Lett. 78, 16 (2001).
[CrossRef]

Christensen, D.

D. Christensen and D. Fowers, Biosens. Bioelectron. 11, 677 (1996).
[CrossRef]

Dereux, A.

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

J.-C. Weeber, A. Dereux, C. Girard, J. R. Krenn, and J.-P. Goudonnet, Phys. Rev. B 60, 9061 (1999).
[CrossRef]

Ditlbacher, H.

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

J. R. Krenn, B. Lamprecht, H. Ditlbacher, G. Schider, M. Salerno, A. Leitner, and F. R. Aussenegg, Europhys. Lett. 60, 663 (2002).
[CrossRef]

B. Lamprecht, J. R. Krenn, G. Schider, H. Ditlbacher, M. Salerno, N. Felidj, A. Leitner, and F. R. Aussenegg, Appl. Phys. Lett. 79, 51 (2001).
[CrossRef]

Felidj, N.

B. Lamprecht, J. R. Krenn, G. Schider, H. Ditlbacher, M. Salerno, N. Felidj, A. Leitner, and F. R. Aussenegg, Appl. Phys. Lett. 79, 51 (2001).
[CrossRef]

Fowers, D.

D. Christensen and D. Fowers, Biosens. Bioelectron. 11, 677 (1996).
[CrossRef]

Girard, C.

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

J.-C. Weeber, A. Dereux, C. Girard, J. R. Krenn, and J.-P. Goudonnet, Phys. Rev. B 60, 9061 (1999).
[CrossRef]

Gotschy, W.

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

Goudonnet, J. P.

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

Goudonnet, J.-P.

J.-C. Weeber, A. Dereux, C. Girard, J. R. Krenn, and J.-P. Goudonnet, Phys. Rev. B 60, 9061 (1999).
[CrossRef]

Gramotnev, D. K.

D. F. P. Pile and D. K. Gramotnev, Opt. Lett. 29, 1069 (2004).
[CrossRef] [PubMed]

D. K. Gramotnev and D. F. P. Pile, Appl. Phys. Lett. 85, 6323 (2004).
[CrossRef]

Harel, E.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, Nat. Mater. 2, 229 (2003).
[CrossRef] [PubMed]

Hohenau, A.

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

Kik, P. G.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, Nat. Mater. 2, 229 (2003).
[CrossRef] [PubMed]

Kobayashi, T.

Koel, B. E.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, Nat. Mater. 2, 229 (2003).
[CrossRef] [PubMed]

Krenn, J. R.

J. R. Krenn, Nat. Mater. 2, 210 (2003).
[CrossRef] [PubMed]

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

J. R. Krenn, B. Lamprecht, H. Ditlbacher, G. Schider, M. Salerno, A. Leitner, and F. R. Aussenegg, Europhys. Lett. 60, 663 (2002).
[CrossRef]

B. Lamprecht, J. R. Krenn, G. Schider, H. Ditlbacher, M. Salerno, N. Felidj, A. Leitner, and F. R. Aussenegg, Appl. Phys. Lett. 79, 51 (2001).
[CrossRef]

J.-C. Weeber, A. Dereux, C. Girard, J. R. Krenn, and J.-P. Goudonnet, Phys. Rev. B 60, 9061 (1999).
[CrossRef]

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

Lacroute, Y.

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

Lamprecht, B.

J. R. Krenn, B. Lamprecht, H. Ditlbacher, G. Schider, M. Salerno, A. Leitner, and F. R. Aussenegg, Europhys. Lett. 60, 663 (2002).
[CrossRef]

B. Lamprecht, J. R. Krenn, G. Schider, H. Ditlbacher, M. Salerno, N. Felidj, A. Leitner, and F. R. Aussenegg, Appl. Phys. Lett. 79, 51 (2001).
[CrossRef]

Leitner, A.

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

J. R. Krenn, B. Lamprecht, H. Ditlbacher, G. Schider, M. Salerno, A. Leitner, and F. R. Aussenegg, Europhys. Lett. 60, 663 (2002).
[CrossRef]

B. Lamprecht, J. R. Krenn, G. Schider, H. Ditlbacher, M. Salerno, N. Felidj, A. Leitner, and F. R. Aussenegg, Appl. Phys. Lett. 79, 51 (2001).
[CrossRef]

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

Maier, S. A.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, Nat. Mater. 2, 229 (2003).
[CrossRef] [PubMed]

S. A. Maier, M. L. Brongersma, and H. A. Atwater, Appl. Phys. Lett. 78, 16 (2001).
[CrossRef]

Maradudin, A. A.

I. V. Novikov and A. A. Maradudin, Phys. Rev. B 66, 035403 (2002).
[CrossRef]

Meltzer, S.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, Nat. Mater. 2, 229 (2003).
[CrossRef] [PubMed]

Monacelli, B.

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

Morimoto, A.

Mur, G.

G. Mur, IEEE Trans. Electromagn. Compat. 40, 100 (1998).
[CrossRef]

Nishio, K.

T. Onuki, Y. Watanabe, K. Nishio, T. Tsuchiya, T. Tani, and T. Tokizaki, J. Microsc. 210, 284 (2003).
[CrossRef] [PubMed]

Novikov, I. V.

I. V. Novikov and A. A. Maradudin, Phys. Rev. B 66, 035403 (2002).
[CrossRef]

Onuki, T.

T. Onuki, Y. Watanabe, K. Nishio, T. Tsuchiya, T. Tani, and T. Tokizaki, J. Microsc. 210, 284 (2003).
[CrossRef] [PubMed]

Pile, D. F. P.

D. K. Gramotnev and D. F. P. Pile, Appl. Phys. Lett. 85, 6323 (2004).
[CrossRef]

D. F. P. Pile and D. K. Gramotnev, Opt. Lett. 29, 1069 (2004).
[CrossRef] [PubMed]

Puscasu, I.

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

Requicha, A. A. G.

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, Nat. Mater. 2, 229 (2003).
[CrossRef] [PubMed]

Salerno, M.

J. R. Krenn, B. Lamprecht, H. Ditlbacher, G. Schider, M. Salerno, A. Leitner, and F. R. Aussenegg, Europhys. Lett. 60, 663 (2002).
[CrossRef]

B. Lamprecht, J. R. Krenn, G. Schider, H. Ditlbacher, M. Salerno, N. Felidj, A. Leitner, and F. R. Aussenegg, Appl. Phys. Lett. 79, 51 (2001).
[CrossRef]

Schaich, W. L.

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

Schider, G.

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

J. R. Krenn, B. Lamprecht, H. Ditlbacher, G. Schider, M. Salerno, A. Leitner, and F. R. Aussenegg, Europhys. Lett. 60, 663 (2002).
[CrossRef]

B. Lamprecht, J. R. Krenn, G. Schider, H. Ditlbacher, M. Salerno, N. Felidj, A. Leitner, and F. R. Aussenegg, Appl. Phys. Lett. 79, 51 (2001).
[CrossRef]

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

Takahara, J.

Taki, H.

Tanaka, K.

K. Tanaka and M. Tanaka, Appl. Phys. Lett. 82, 1158 (2003).
[CrossRef]

Tanaka, M.

K. Tanaka and M. Tanaka, Appl. Phys. Lett. 82, 1158 (2003).
[CrossRef]

Tani, T.

T. Onuki, Y. Watanabe, K. Nishio, T. Tsuchiya, T. Tani, and T. Tokizaki, J. Microsc. 210, 284 (2003).
[CrossRef] [PubMed]

Tokizaki, T.

T. Onuki, Y. Watanabe, K. Nishio, T. Tsuchiya, T. Tani, and T. Tokizaki, J. Microsc. 210, 284 (2003).
[CrossRef] [PubMed]

Tsuchiya, T.

T. Onuki, Y. Watanabe, K. Nishio, T. Tsuchiya, T. Tani, and T. Tokizaki, J. Microsc. 210, 284 (2003).
[CrossRef] [PubMed]

Watanabe, Y.

T. Onuki, Y. Watanabe, K. Nishio, T. Tsuchiya, T. Tani, and T. Tokizaki, J. Microsc. 210, 284 (2003).
[CrossRef] [PubMed]

Weeber, J. C.

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

Weeber, J.-C.

J.-C. Weeber, A. Dereux, C. Girard, J. R. Krenn, and J.-P. Goudonnet, Phys. Rev. B 60, 9061 (1999).
[CrossRef]

Yamagishi, S.

Appl. Phys. Lett.

B. Lamprecht, J. R. Krenn, G. Schider, H. Ditlbacher, M. Salerno, N. Felidj, A. Leitner, and F. R. Aussenegg, Appl. Phys. Lett. 79, 51 (2001).
[CrossRef]

S. A. Maier, M. L. Brongersma, and H. A. Atwater, Appl. Phys. Lett. 78, 16 (2001).
[CrossRef]

K. Tanaka and M. Tanaka, Appl. Phys. Lett. 82, 1158 (2003).
[CrossRef]

D. K. Gramotnev and D. F. P. Pile, Appl. Phys. Lett. 85, 6323 (2004).
[CrossRef]

Biosens. Bioelectron.

D. Christensen and D. Fowers, Biosens. Bioelectron. 11, 677 (1996).
[CrossRef]

Europhys. Lett.

J. R. Krenn, B. Lamprecht, H. Ditlbacher, G. Schider, M. Salerno, A. Leitner, and F. R. Aussenegg, Europhys. Lett. 60, 663 (2002).
[CrossRef]

IEEE Trans. Electromagn. Compat.

G. Mur, IEEE Trans. Electromagn. Compat. 40, 100 (1998).
[CrossRef]

J. Microsc.

T. Onuki, Y. Watanabe, K. Nishio, T. Tsuchiya, T. Tani, and T. Tokizaki, J. Microsc. 210, 284 (2003).
[CrossRef] [PubMed]

Nat. Mater.

J. R. Krenn, Nat. Mater. 2, 210 (2003).
[CrossRef] [PubMed]

S. A. Maier, P. G. Kik, H. A. Atwater, S. Meltzer, E. Harel, B. E. Koel, and A. A. G. Requicha, Nat. Mater. 2, 229 (2003).
[CrossRef] [PubMed]

Opt. Lett.

Phys. Rev. B

J.-C. Weeber, A. Dereux, C. Girard, J. R. Krenn, and J.-P. Goudonnet, Phys. Rev. B 60, 9061 (1999).
[CrossRef]

G. Schider, J. R. Krenn, A. Hohenau, H. Ditlbacher, A. Leitner, F. R. Aussenegg, W. L. Schaich, I. Puscasu, B. Monacelli, and G. Boreman, Phys. Rev. B 68, 155427 (2003).
[CrossRef]

I. V. Novikov and A. A. Maradudin, Phys. Rev. B 66, 035403 (2002).
[CrossRef]

Phys. Rev. Lett.

J. R. Krenn, A. Dereux, J. C. Weeber, E. Bourillot, Y. Lacroute, J. P. Goudonnet, G. Schider, W. Gotschy, A. Leitner, F. R. Aussenegg, and C. Girard, Phys. Rev. Lett. 82, 2590 (1999).
[CrossRef]

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Figures (4)

Fig. 1
Fig. 1

Structure with a V-groove subwavelength waveguide with a sharp 90° bend on a metal substrate: (a) three-dimensional view and (b),(c) top views. (a),(b) Structure with a wedge pillar defect in the corner of the bend. (c) The bend without the pillar defect.

Fig. 2
Fig. 2

Top view of the field distribution (magnitude of the electric field) in CPPs at the distance of 60 nm from the tip of the V groove with the 90° bend in silver. The structural parameters are as follows: the angle of both the grooves θ = 30 ° , λ ( vacuum ) = 0.6328 μ m , and the permittivity of silver ε m = 16.22 + 0.52 i .[15]

Fig. 3
Fig. 3

(a) Dependences of the amplitude transmissivity T through the bend as a function of position of the corner of the pillar on the L axis. For example, the insert in (a) shows the shifted pillar defect along the negative L direction; i.e., the pillar is reduced in size. The point L = 0 corresponds to x = 0 , y = 0 . (b) The dotted curve gives the dependence of T on extension of the pillar into the first arm of the bend (c), i.e., on the x coordinate of the pillar corner at y = 0 . The solid curve gives the dependence of T on extension of the pillar into the second arm of the bend (d), i.e., on the y coordinate of the pillar corner at x = 0 . The dashed lines in both the plots give T in the absence of the pillar defect [Fig. 1(c)].

Fig. 4
Fig. 4

Distribution of the magnitude of the electric field in the middle of the grooves along the direction of propagation of CPP for the structure with the corner of the pillar defect in the middle of the bend (at x = 0 , y = 0 )—Figs. 1(a), 1(b). That is, the left half of the field distribution is in the ( x , z ) plane (incident CPP) up to the corner of the pillar defect, and the right half of the distribution is in the ( y , z ) plane (transmitted CPP) from the corner of the pillar defect. Between these two parts of the distribution is the corner of the pillar defect with the strongly localized wedge plasmon resulting in energy tapping from the bend. The weak decrease of the field in the second arm of the bend is mainly due to interference of two different CPP modes generated in the groove by means of the end-fire excitation.[13] Note that the weak periodic field pattern at noticeable distances from the tip of the groove, especially in the first arm of the bend, is the residual effect of the end-fire excitation, rather than a leakage from CPP.

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