Near-Field Second-Harmonic Generation Induced by Local Field Enhancement
Alexandre BouhélierThe Institute of Optics, University of Rochester, Rochester, New York 14627, USAMichael R. BeversluisThe Institute of Optics, University of Rochester, Rochester, New York 14627A. HartschuhThe Institute of Optics, University of Rochester, Rochester, New York 14627Lukáš NovotnýThe Institute of Optics, University of Rochester, Rochester, New York 14627
2003en
ABI
Annotatsiya
The field near a sharp metal tip can be strongly enhanced if irradiated with an optical field polarized along the tip axis. We demonstrate that the enhanced field gives rise to local second-harmonic (SH) generation at the tip surface thereby creating a highly confined photon source. A theoretical model for the excitation and emission of SH radiation at the tip is developed and it is found that this source can be represented by a single on-axis oscillating dipole. The model is experimentally verified by imaging the spatial field distribution of strongly focused laser modes.
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