Abstract

The effects of plasmon polariton excitation on a metal surface with weak one-dimensional roughness are studied experimentally. It is shown that backscattering enhancement requires the excitation of counterpropagating polaritons, whereas surface waves traveling in one direction produce diffuse scatter without a strong backscattering peak.

© 1996 Optical Society of America

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References

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  1. A. R. McGurn, A. A. Maradudin, V. Celli, Phys. Rev. B 31,4866 (1985).
    [CrossRef]
  2. V. Celli, A. A. Maradudin, A. M. Marvin, A. R. McGurn, J. Opt. Soc. Am. A 2, 2225 (1985).
    [CrossRef]
  3. P. Tran, V. Celli, J. Opt. Soc. Am. A 5, 1635 (1988).
    [CrossRef]
  4. A. A. Maradudin, E. R. Méndez, Appl. Opt. 32, 3335 (1993).
    [CrossRef] [PubMed]
  5. T. R. Michel, J. Opt. Soc. Am. A 11, 1874 (1994).
    [CrossRef]
  6. C. S. West, K. A. O’Donnell, J. Opt. Soc. Am. A 12390 (1995).
    [CrossRef]

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Figures (5)

Fig. 1
Fig. 1

Scattering of an incident wave by a metal surface with one-dimensional roughness. The incident and scattering angles θi and θs are positive as shown.

Fig. 2
Fig. 2

Results from surface profilometry. Top: Profilometer data segment of 25-μm horizontal length (vertical scale ±70 nm). Bottom: Roughness spectrum S(k) estimated from 110 scans of length 84-μm each; the rms surface roughness [the square root of the area of S(k)] is 15.5 nm. The arrows denote the desired spectral limits (kmin = 8.56 × 10−3nm−1 kmax = 1.33 × 10−2 nm−1) determined from the fabrication parameters; letters denote estimates of ksp for λ = A, 674 nm; B, 612 nm; C, 543 nm.

Fig. 3
Fig. 3

Power of the specular reflection (normalized to unit incident power) in p polarization as a function of incidence angle θi for wavelengths λ as indicated. Circles and diamonds denote steeply sloped regions that are due to the excitation of +ksp and −ksp, respectively; these overlap for λ = 612 nm.

Fig. 4
Fig. 4

Ip and Is for λ = 674 nm and θi = 4° (top) and λ = 543 nm and θi = 0° (bottom). The arrows denote the backscattering direction. Curve areas denote total diffusely scattered power for identically polarized incident power of unity; for example, at 674 nm the areas of Ip and Is are 0.102 and 0.00992, respectively.

Fig. 5
Fig. 5

Top: Ip for λ = 674 nm for θi and θs within the polariton coupling region. The open region along the plot’s diagonal surrounds the specular reflection; backscattering enhancement appears at θs = −θi in the central region. Lower plots: Details of Ip for selected θi. Ticks on the vertical axis are spaced by 0.05. The curve segment for θi = 19° has been magnified in the vertical scale by 25.

Equations (2)

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± k sp = ( ω / c ) sin θ i ± k r ,
( ω / c ) sin θ s = ± k sp k r ,

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