Near-Field Second-Harmonic Generation Induced by Local Field Enhancement

A. Bouhelier, M. Beversluis, A. Hartschuh, and L. Novotny
Phys. Rev. Lett. 90, 013903 – Published 10 January 2003

Abstract

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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  • Received 8 March 2002

DOI:https://doi.org/10.1103/PhysRevLett.90.013903

©2003 American Physical Society

Authors & Affiliations

A. Bouhelier, M. Beversluis, A. Hartschuh, and L. Novotny*

  • The Institute of Optics, University of Rochester, Rochester, New York 14627

  • *Electronic address: novotny@optics.rochester.edu

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Vol. 90, Iss. 1 — 10 January 2003

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