We report the observation of enhanced optical second-harmonic generation in reflection with simultaneous phase-matched excitation of the fundamental short-range and the harmonic long-range surface plasmon modes. Resonant second-harmonic generation due to separate excitation of the fundamental long-range and short-range surface plasmon modes and harmonic long-range surface plasmon mode is also observed.
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Quail et al. (1984) studied this question.
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