Phase measurement of second-harmonic generation in Langmuir-Blodgett films

Hiromi Kimura-Suda; Tatsuo Wada; Wei Liang; Hiroo Nakahara; Hiroyuki Sasabe

doi:10.1117/12.328583

29 October 1998 Phase measurement of second-harmonic generation in Langmuir-Blodgett films

Hiromi Kimura-Suda, Tatsuo Wada, Wei Liang, Hiroo Nakahara, Hiroyuki Sasabe

Proceedings Volume 3474, Second-Order Organic Nonlinear Optics; (1998) https://doi.org/10.1117/12.328583
Event: SPIE's International Symposium on Optical Science, Engineering, and Instrumentation, 1998, San Diego, CA, United States

Abstract

The Langmuir-Blodgett (LB) films of tolan derivatives were studied by a new second-harmonic generation (SHG) phase measurement in terms of the directional sense of the net dipole moment and molecular structures. 4-Docosylamino-tolan derivatives with 4'-nitro group (ANT-22) or 4'-dicyano-vinyl (DCNANT-22) group were transferred by horizontal lifting. In rotational Maker-fringe, the envelope of ANT-22 LB film shows an in-plane polar anisotropy, and that of DCNANT-22 LB film shows a polar anisotropy perpendicular to the substrate. Nonlinear optical chromophore in ANT-22 is bound to lie almost flat upon the plane of the substrate, while DCNANT-22 molecules in thick multilayers tend to align perpendicular to the substrate. It was found by SHG phase measurement that the directional sense of the net dipole moment of ANT-22 was perpendicular to the compression direction.

Citation Download Citation

Hiromi Kimura-Suda, Tatsuo Wada, Wei Liang, Hiroo Nakahara, and Hiroyuki Sasabe "Phase measurement of second-harmonic generation in Langmuir-Blodgett films", Proc. SPIE 3474, Second-Order Organic Nonlinear Optics, (29 October 1998); https://doi.org/10.1117/12.328583

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