Journal
OPTICS EXPRESS
Volume 16, Issue 19, Pages 14703-14715Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.16.014703
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- Delegation Generale pour l'Armement (DGA)
- Agence Nationale de la Recherche (ANR)
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We use a vector field model to analyze third- harmonic generation (THG) from model geometries (interfaces, slabs, periodic structures) illuminated by Hermite- Gaussian (HG) and Laguerre- Gaussian (LG) beams focused by a high NA lens. Calculations show that phase matching conditions are significantly affected by the tailoring of the field distribution near focus. In the case of an interface parallel to the optical axis illuminated by an odd HG mode, the emission patterns and signal level reflect the relative orientation of the interface and the focal field structure. In the case of slabs and periodic structures, the emission patterns reflect the interplay between focal field distribution (amplitude and phase) and sample structure. Forward- to- backward emission ratios using different beam shapes provide sub- wavelength information about sample spatial frequencies. (C) 2008 Optical Society of America.
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