Near-field nonlinear optical spectroscopy of Langmuir–Blodgett films
JOSA A, Vol. 15, Issue 8, pp. 2156-2162 (1998)
http://dx.doi.org/10.1364/JOSAA.15.002156
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Abstract
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
[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
Citation
Sergey I. Bozhevolnyi and Tommy Geisler, "Near-field nonlinear optical spectroscopy of Langmuir–Blodgett films," J. Opt. Soc. Am. A 15, 2156-2162 (1998)
http://www.opticsinfobase.org/josaa/abstract.cfm?URI=josaa-15-8-2156
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