5 February 1996 Hydrodynamic model of second-harmonic generation at metal surfaces
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Proceedings Volume 2730, Second Iberoamerican Meeting on Optics; (1996) https://doi.org/10.1117/12.231101
Event: Second Iberoamerican Meeting on Optics, 1995, Guanajuato, Mexico
Abstract
The bulk electric-dipole contribution to the optical second harmonic generation (SHG) of centrosymmetric systems is (almost) null, so that SHG constitutes a good optical probe of their surface. We present a generalized hydrodynamic model for the calculation of the SHG spectra of simple metals with a smoothly varying surface electronic density profile. The equations of motion include a pressure term derived from the Thomas-Fermi-Dirac-von Weizsacker energy-functional, thus it includes some effects of exchange and correlation. The surface is capable of sustaining multipolar collective modes besides the ordinary surface plasmon. The former have proved capable of sustaining multipolar collective modes besides the ordinary surface plasmon. The former have proved to be very elusive and have only recently been observed with HREELS. We have obtained very large peaks in the non-linear susceptibility at the frequency of the multipolar resonance and its subharmonic, at which the SHG efficiency is enhanced several orders of magnitude, suggesting the usefulness of SHG as a probe of surface collective modes.
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J. A. Maytorena, J. A. Maytorena, W. Luis Mochan, W. Luis Mochan, Bernardo S. Mendoza, Bernardo S. Mendoza, } "Hydrodynamic model of second-harmonic generation at metal surfaces", Proc. SPIE 2730, Second Iberoamerican Meeting on Optics, (5 February 1996); doi: 10.1117/12.231101; https://doi.org/10.1117/12.231101
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