Abstract

The excitation of surface plasmons at a flat interface between a uniaxial crystal and a metal is investigated theoretically. We show that strong couplings between surface plasmons and light incident from the crystal can be obtained without corrugation of the surface. These couplings are associated with significant reductions in the reflectivity of the structure and with strong enhancements of the electromagnetic field on the surface of the crystal. Numerical examples obtained for a flat interface between sodium nitrate and gold show the existence of critical orientations of the optic axis for which all the incident power is absorbed by the metal.

© 1995 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-Verlag, Heidelberg, 1988), Chap. 2, pp. 4–39.
  2. A. D. Boardman, ed., Electromagnetic Surface Modes (Wiley, New York, 1982).
  3. G. Borstel, H. J. Falge, in Electromagnetic Surface Modes, A. D. Boardman, ed. (Wiley, New York, 1982), Chap. 6, pp. 219–248.
  4. R. F. Wallis, in Electromagnetic Surface Modes, A. D. Boardman, ed., (Wiley, New York, 1982), Chap. 15, pp. 575–631.
  5. H. C. Chen, Theory of Electromagnetic Waves: A Coordinate Free Approach (McGraw-Hill, New York, 1983), Chap. 6, pp. 219–262.
  6. D. Maystre, in Electromagnetic Surface Modes, A. D. Boardman, ed. (Wiley, New York, 1982), Chap. 17, pp. 661–724.
  7. R. A. Depine, M. L. Gigli, J. Mod. Opt. 41, 695 (1994).
    [CrossRef]
  8. R. A. Depine, M. L. Gigli, Phys. Rev. B 49, 8437 (1994).
    [CrossRef]
  9. M. L. Gigli, R. A. Depine, J. Mod. Opt. 42, 1281 (1995).
    [CrossRef]
  10. M. E. Inchaussandague, R. A. Depine, J. Opt. Soc. Am. A 12, 1261 (1995).
    [CrossRef]

1995 (2)

1994 (2)

R. A. Depine, M. L. Gigli, J. Mod. Opt. 41, 695 (1994).
[CrossRef]

R. A. Depine, M. L. Gigli, Phys. Rev. B 49, 8437 (1994).
[CrossRef]

Borstel, G.

G. Borstel, H. J. Falge, in Electromagnetic Surface Modes, A. D. Boardman, ed. (Wiley, New York, 1982), Chap. 6, pp. 219–248.

Chen, H. C.

H. C. Chen, Theory of Electromagnetic Waves: A Coordinate Free Approach (McGraw-Hill, New York, 1983), Chap. 6, pp. 219–262.

Depine, R. A.

M. L. Gigli, R. A. Depine, J. Mod. Opt. 42, 1281 (1995).
[CrossRef]

M. E. Inchaussandague, R. A. Depine, J. Opt. Soc. Am. A 12, 1261 (1995).
[CrossRef]

R. A. Depine, M. L. Gigli, Phys. Rev. B 49, 8437 (1994).
[CrossRef]

R. A. Depine, M. L. Gigli, J. Mod. Opt. 41, 695 (1994).
[CrossRef]

Falge, H. J.

G. Borstel, H. J. Falge, in Electromagnetic Surface Modes, A. D. Boardman, ed. (Wiley, New York, 1982), Chap. 6, pp. 219–248.

Gigli, M. L.

M. L. Gigli, R. A. Depine, J. Mod. Opt. 42, 1281 (1995).
[CrossRef]

R. A. Depine, M. L. Gigli, J. Mod. Opt. 41, 695 (1994).
[CrossRef]

R. A. Depine, M. L. Gigli, Phys. Rev. B 49, 8437 (1994).
[CrossRef]

Inchaussandague, M. E.

Maystre, D.

D. Maystre, in Electromagnetic Surface Modes, A. D. Boardman, ed. (Wiley, New York, 1982), Chap. 17, pp. 661–724.

Raether, H.

H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings (Springer-Verlag, Heidelberg, 1988), Chap. 2, pp. 4–39.

Wallis, R. F.

R. F. Wallis, in Electromagnetic Surface Modes, A. D. Boardman, ed., (Wiley, New York, 1982), Chap. 15, pp. 575–631.

J. Mod. Opt. (2)

R. A. Depine, M. L. Gigli, J. Mod. Opt. 41, 695 (1994).
[CrossRef]

M. L. Gigli, R. A. Depine, J. Mod. Opt. 42, 1281 (1995).
[CrossRef]

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

Phys. Rev. B (1)

R. A. Depine, M. L. Gigli, Phys. Rev. B 49, 8437 (1994).
[CrossRef]

Other (6)

H. Raether, Surface Plasmons on Smooth and Rough Surfaces and on Gratings (Springer-Verlag, Heidelberg, 1988), Chap. 2, pp. 4–39.

A. D. Boardman, ed., Electromagnetic Surface Modes (Wiley, New York, 1982).

G. Borstel, H. J. Falge, in Electromagnetic Surface Modes, A. D. Boardman, ed. (Wiley, New York, 1982), Chap. 6, pp. 219–248.

R. F. Wallis, in Electromagnetic Surface Modes, A. D. Boardman, ed., (Wiley, New York, 1982), Chap. 15, pp. 575–631.

H. C. Chen, Theory of Electromagnetic Waves: A Coordinate Free Approach (McGraw-Hill, New York, 1983), Chap. 6, pp. 219–262.

D. Maystre, in Electromagnetic Surface Modes, A. D. Boardman, ed. (Wiley, New York, 1982), Chap. 17, pp. 661–724.

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Figures (4)

Fig. 1
Fig. 1

Trajectory of α 0 P / k 0 in the complex plane when φc is varied from 0° to 90°. The other parameters are θc = 90°, = 2.51, || = 1.78, μ2 = 1, 1 = −21.6 + 1.4i, and μ1 = 1.

Fig. 2
Fig. 2

Trajectories of α 0 p / k 0 (pluses) and α 0 z / k 0 (filled circles) in the complex plane when φc = 45° (fixed) and θc is varied from 0° to 30°. The other parameters are as in Fig. 1.

Fig. 3
Fig. 3

Curves of total reflectivity (R) versus α0/k0 for a flat uniaxial–metallic interface illuminated by an ordinary wave. The parameters are as in Figs. 1 and 2, except that φc = 45° and θc = 4° and 25°.

Fig. 4
Fig. 4

Power losses (T) versus α0/k0 for a flat uniaxial– metallic interface illuminated by an ordinary wave. The parameters are as in Fig. 3, except that θc = 9°, 11°, and 13°.

Equations (5)

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E ± ( r ) = C o ± e ^ o ± exp ( i k o ± · r ) + C e ± e ^ e ± exp ( i k e ± · r ) ,
γ e ± = ( - ) c y c x α 0 ± Γ 1 / 2 + ( - ) c y 2 ,
ρ = μ 2 [ ( 1 - c y 2 + c y 2 ) ] ( 1 - c z 2 ) + c z 2 .
E t ( r ) = [ B s z ^ + B p ( k ^ t × z ^ ) ] exp ( i k t · r ) ,
( C o - C e - ) = ( R o o R o e R e o R e e ) ( C o + C e + ) .

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