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Journal of the Optical Society of America A

Journal of the Optical Society of America A


  • Vol. 15, Iss. 8 — Aug. 1, 1998
  • pp: 2156–2162

Near-field nonlinear optical spectroscopy of Langmuir–Blodgett films

Sergey I. Bozhevolnyi and Tommy Geisler  »View Author Affiliations

JOSA A, Vol. 15, Issue 8, pp. 2156-2162 (1998)

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Using an uncoated fiber tip as a light source and a multilayer Langmuir–Blodgett film of 2-docosylamino-5-nitropyridine as a sample, we obtain near-field images at the fundamental-harmonic (FH) and second-harmonic (SH) wavelengths for different polarizations and wavelengths of the pump light. The spatial resolution of 100 nm is achieved in near-field SH images that are not correlated with either the topographical or the FH images. It is directly demonstrated that SH generation is most concentrated inside submicrometer-sized (300–500 nm) crystallike domains, which are oriented differently but predominantly in the dipping direction and whose SH efficiency is maximum for pump wavelengths in the range of 770–800 nm.

© 1998 Optical Society of America

OCIS Codes
(170.5810) Medical optics and biotechnology : Scanning microscopy
(190.4350) Nonlinear optics : Nonlinear optics at surfaces
(190.4710) Nonlinear optics : Optical nonlinearities in organic materials
(240.0310) Optics at surfaces : Thin films
(300.6320) Spectroscopy : Spectroscopy, high-resolution
(310.6860) Thin films : Thin films, optical properties

Original Manuscript: October 14, 1997
Revised Manuscript: April 21, 1998
Manuscript Accepted: April 7, 1998
Published: August 1, 1998

Sergey I. Bozhevolnyi and Tommy Geisler, "Near-field nonlinear optical spectroscopy of Langmuir–Blodgett films," J. Opt. Soc. Am. A 15, 2156-2162 (1998)

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