The current induced by incident photons on an gold grating slab is investigated numerically and experimentally. A semi-classical electrodynamic model is developed under the weak nonlinearity approximation. Electrons in the conduction band are treated as an electron gas in the presence of a self-consistent electromagnetic field. The model is solved by the finite element method and compared with measurements. The calculated current density as a function of incident angle and wavelength is found to be in qualitative agreement with the experimental measurements. The results show that increasing surface plasmon spatial variation enhances photon induced current.
English, Alex; Cheng, Cheng-Wen; Lowe, Lloyd II; Shih, Min-Hsiung; and Kuang, Wan. (2011). "Hydrodynamic Modeling of Surface Plasmon Enhanced Photon Induced Current in a Gold Grating". Applied Physics Letters, 98(19), . http://dx.doi.org/10.1063/1.3590200