Observations of backscattering effects in second-harmonic generation from a weakly rough metal surface

O’Donnell, K. A.; Torre, Renato; West, C. S.

doi:10.1364/ol.21.001738

Cited by 31 publications

(11 citation statements)

References 7 publications

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“…The distribution is quite different from the Gaussian case and the various features seen arise from different perturbation terms of Eq. (8). The scatter for θ s ≤ −°36 is due largely to the 1-1 term, though other higher-order terms also make contributions there.…”

Section: Numerical Resultsmentioning

confidence: 95%

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High-order effects in the scattering of light due to plasmon polariton excitation on metal surfaces

O’Donnell¹

2001

SPIE Proceedings

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If a metal surface has a roughness of a few nanometers, an incident light wave may excite the surface waves known as surface plasmon polaritons. In turn, the plasmon polaritons may themselves be outwardly surface-coupled to produce effects in the light escaping from the surface. Here, the polariton-related effects in both the fundamental and second-harmonic emitted light are considered. In the linear case, a theoretical approach is developed that allows the polaritons to be scattered several times within the surface before coupling to diffuse light escaping from the surface. In the diffuse scatter emitted by a randomly rough surface, these high-order processes are shown to produce changes in the shape and width of the backscattering peak. In experimental results for the emitted second-harmonic generation, it is found that the features are dominated by the contributions of polaritons at both the fundamental and harmonic frequencies. These nonlinear wave interactions are illustrated with experimental results for randomly rough and for quasiperiodic surfaces.

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Section: Numerical Resultsmentioning

confidence: 95%

“…(4-6) are inserted into Eq. (8). The resulting moments of ζ are expanded with the assumption that h x ( ) is a real Gaussian process and, particularly in the higher orders, many terms are thus obtained.…”

Section: Theoretical Approachmentioning

confidence: 99%

High-order effects in the scattering of light due to plasmon polariton excitation on metal surfaces

O’Donnell¹

2001

SPIE Proceedings

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“…The results of these calculations showed that either a peak or a dip can occur in the retroreflection direction in the angular dependence of the intensity of the second harmonic light depending on the values of the phenomenological constants entering the nonlinear boundary conditions, and on the angle of incidence, and that there is no real peak in the direction normal to the mean surface. The experimental observation that only a dip occurs in the retroreflection direction for all angles of incidence 115,116 places significant constraints on the values of the phenomenological constants in the nonlinear boundary conditions. Surface plasmon polaritons were shown to play a prominent role in the formation of the features observed in the retroreflection direction, which were attributed to the nonlinear excitation of these surface waves at the harmonic frequency.…”

Section: Second Harmonic Generation At Clean Vacuum-metal Interfacesmentioning

confidence: 99%

“…The scattering data were absolutely normalized, which permits quantitative comparisons of experimental and theoretical results to be made. It was found that for both weakly 115,116 and strongly 117 rough surfaces a dip is present in the retroreflection direction in the angular dependence of the intensity of the scattered second harmonic light rather than the peak that occurs in scattering at the fundamental frequency. No peak in the direction normal to the mean surface was observed in these experiments.…”

Section: Second Harmonic Generation At Clean Vacuum-metal Interfacesmentioning

confidence: 99%

Light Scattering from Randomly Rough Surfaces

Maradudin

Mendez

2007

Science Progress

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A survey is given of a variety of effects that can arise in the scattering of electromagnetic waves from one-and two-dimensional randomly rough surfaces. The focus is primarily on multiple-scattering effects such as enhanced backscattering, enhanced transmission, satellite peaks, new features in speckle correlations and in second harmonic generation in reflection. Theoretical treatments of these phenomena are outlined, and experimental results illustrating them are presented.

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“…The occurrence of large surface EM fields is indeed crucial to the EM mechanism in Surface-Enhanced Raman Scattering (SERS) and to other non-linear surface optical processes. [26,29,30,31,32,38,39] Furthermore, the predicted, enormously high values of the surface electric field intensity have been related to the recent observation of SERS single molecule probing. [40,41,42] It is our aim to employ the above mentioned rigorous Green's theorem formulation to study the far-field and near-field scattered from one-dimensionally rough, self-affine fractal Ag surfaces, restricted to one dimension for the sake of computational limitations.…”

Section: Introductionmentioning

confidence: 97%

Light scattering from self-affine fractal silver surfaces with nanoscale cutoff: far-field and near-field calculations

Sánchez‐Gil

Garcı́a-Ramos

Mendez³

2002

J. Opt. Soc. Am. A

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We study the light scattered from randomly rough, one-dimensional self-affine fractal silver surfaces with nanoscale lower cutoff, illuminated by s-or p-polarized Gaussian beams a few microns wide. By means of rigorous numerical calculations based on the Green theorem integral equation formulation, we obtain both the far-and near-field scattered intensities. The influence of diminishing the fractal lower scale cutoff (from below a hundred, down to a few nanometers) is analyzed in the case of both single realizations and ensemble average magnitudes. For s polarization, variations are small in the far field, being only significant in the higher spatial frequency components of evanescent character in the near field. In the case of p polarization, however, the nanoscale cutoff has remarkable effects stemming from the roughness-induced excitation of surface-plasmon polaritons. In the far field, the effect is noticed both in the speckle pattern variation and in the decrease of the total reflected energy upon ensemble averaging, due to increased absorption. In the near field, more efficient excitation of localized optical modes is achieved with smaller cutoff, which in turn leads to huge surface electric field enhancements.

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Observations of backscattering effects in second-harmonic generation from a weakly rough metal surface

Cited by 31 publications

References 7 publications

High-order effects in the scattering of light due to plasmon polariton excitation on metal surfaces

High-order effects in the scattering of light due to plasmon polariton excitation on metal surfaces

Light Scattering from Randomly Rough Surfaces

Light scattering from self-affine fractal silver surfaces with nanoscale cutoff: far-field and near-field calculations

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