19 May 2006 Optical rectification at metal surfaces investigated in the terahertz frequency range
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Abstract
We report on optical rectification at bulk and thin film noble metal (Ag and Au) surfaces investigated by means of terahertz time-domain spectroscopy. The experimental data are well modelled using a nonlinear surface susceptibility tensor. The main contribution comes from the charges moving along the surface normal. For gold films, the terahertz signal decreases dramatically for thicknesses below 150 nm. We tentatively explain this phenomenon by screening of the nonlinear polarization by the field induced by charges that have moved across the layer.
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Jean-Louis Coutaz, Filip Kadlec, Petr Kuzel, "Optical rectification at metal surfaces investigated in the terahertz frequency range", Proc. SPIE 6257, ICONO 2005: Nonlinear Laser Spectroscopy, High Precision Measurements, and Laser Biomedicine and Chemistry, 62570M (19 May 2006); doi: 10.1117/12.678367; https://doi.org/10.1117/12.678367
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