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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Vol. 15, Iss. 1 — Jan. 1, 1998
  • pp: 466–470

Improved second-harmonic generation from homomolecular Langmuir Blodgett films of a transparent dye

Geoffrey J. Ashwell, Tokuhiko Handa, and Rakesh Ranjan  »View Author Affiliations


JOSA B, Vol. 15, Issue 1, pp. 466-470 (1998)
http://dx.doi.org/10.1364/JOSAB.15.000466


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Abstract

The optically nonlinear dye [E-N-dodecyl-4-(2-(4-docosyloxyphenyl)ethenyl)quinolinium]+-(octadecylsulfate)x(bromide)1−x forms noncentrosymmetric Langmuir–Blodgett films. The second-harmonic intensity increases quadratically with the number of layers in the range investigated, i.e., as I2ω(N) = I2ω(1)N2 for 2≤ N≤ 100, and shows long-term stability. Films of the dye are almost transparent, with an absorbance of 3 × 10−4 layer−1 at the second-harmonic wavelength, but, nonetheless, the equivalent monolayer intensity, I2ω(N)/N2, is ~30% of the resonantly enhanced signal from monolayer films of the colored hemicyanine dye reported by Girling et al. [J. Opt. Soc. Am. B 4, 950 (1987)]. The second-order susceptibility, film thickness, and chromophore tilt angle relative to the normal to the substrate are χzzz(2) = 26 pm V−1 at 1.064 μm, l = 5.0 nm layer−1, and φ 30°, respectively, for x = 0.5.

© 1998 Optical Society of America

OCIS Codes
(310.3840) Thin films : Materials and process characterization

Citation
Geoffrey J. Ashwell, Tokuhiko Handa, and Rakesh Ranjan, "Improved second-harmonic generation from homomolecular Langmuir Blodgett films of a transparent dye," J. Opt. Soc. Am. B 15, 466-470 (1998)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-15-1-466

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