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

Bouhelier, Alexandre; Beversluis, M.; Hartschuh, Achim und Novotny, Lukas (2003): Near-Field Second-Harmonic Generation Induced by Local Field Enhancement. In: Physical Review Letters, Bd. 90, Nr. 1: 013903-1-013903-4

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.

• Dokumententyp: Zeitschriftenartikel
• Publikationsform: Publisher's Version
• Fakultät: Chemie und Pharmazie
• Themengebiete: 500 Naturwissenschaften und Mathematik > 540 Chemie
• ISSN: 0031-9007
• Sprache: Englisch