Second harmonic generation from nanocrystals under linearly and circularly polarized excitations

We study second harmonic generation (SHG) from noncentrosymmetric nanocrystals under linearly polarized (LP) and circularly polarized (CP) excitations. Theoretical models are developed for SHG from nanocrystals under both plane-wave and focused excitations. We find that the focused excitation reduces the polarization dependency of the SHG signal. We show that the SHG response under CP excitation is generally inferior to the average of LP excitations over all orientations. We verify the theory by measuring the SHG polar responses from BaTiO3 nanocrystals with a scanning confocal microscope. The experimental data agrees well with the theory. © 2010 Optical. Society of America.


Published in:
Optics Express, 18, 11, 11917-11932
Year:
2010
ISSN:
10944087
Keywords:
Other identifiers:
Scopus: 2-s2.0-77952799715
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 Record created 2010-11-23, last modified 2018-03-17

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