| Original Articles |
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Analysis of Second-Harmonic Generation from CuttbPc LB Film/Metal Interface |
| CHENG Xiao-Man1,2;YAO Su-Wei1;LI Cheng-Quan3;MANAKA Takaaki3;IWAMOTO Mitsumasa3 |
| 1School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072
2Department of Opto-electronic Information and Electrical Engineering, Tianjin Institute of Technology, Tianjin 300191
3Department of Physical Electronics, Tokyo Institute of Technology, Tokyo 152-8552, Japan |
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| Cite this article: |
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CHENG Xiao-Man, YAO Su-Wei, LI Cheng-Quan et al 2004 Chin. Phys. Lett. 21 153-155 |
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Abstract Second-harmonic generation signals from a CuttbPc LB film deposited on metal (Al or Au)--glass substrates were investigated. It was observed that there were two second-harmonic peaks at the wavelength of 1060 and 1250 nm in the CuttbPc/Al film, but only one peak at 1050 nm in the CuttbPc/Au film. Meanwhile the surface electric potentials (SEP) at the interfaces of LB film/metals were also measured using a Kelvin probe. The SEP in the CuttbPc/Al decreases and eventually approaches a saturated value of -1.0 V as the film thickness increases, while the SEP in the uttbPc/Au is nearly zero. Based on the experimental results and theoretical analysis, it was considered that the space-charge-induced electric field makes a main contribution to the second-harmonic generation at 1250 nm in the CuttbPc/Al film.
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| Keywords:
68.47.Pe
42.65.-k
73.50.-h
82.35.Ej
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Published: 01 January 2004
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| PACS: |
68.47.Pe
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(Langmuir-Blodgett films on solids; polymers on surfaces; biological molecules on surfaces)
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42.65.-k
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(Nonlinear optics)
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73.50.-h
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(Electronic transport phenomena in thin films)
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82.35.Ej
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(Nonlinear optics with polymers)
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