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Second harmonic generation at the interface of copper tetra-tert-butyl phthalocyanine Langmuir-Blodgett film/metal
Authors:Email author" target="_blank">Cheng?Xiaoman?Email author  Suwei?Yao  Chengquan?Li  Takaaki?Manaka  Mitsumasa?Iwamoto
Institution:1. School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China; Department of Opto-electronic Information & Electrical Engineering, Tianjin Institute of Technology, Tianjin 300191, China
2. School of Chemical Engineering & Technology, Tianjin University, Tianjin 300072, China
3. Department of Physical Electronics, Tokyo Institute of Technology, Tokyo 152-8552, Japan
Abstract:Optical second harmonic generation (SHG) from the copper tetra-tert-butyl phthalocya-nine (CuttbPc) Langmuir-Blodgett (LB) film deposited on a metal-coated glass slide substrate has been investigated. It is considered that the symmetry of the CuttbPc molecule may be broken by the space charge-induced electric field (SCIEF) due to the exchanged charges at the CuttbPc LB film/metal interface. A four-layer model is used to explain the nonlinear optical process in the CuttbPc LB film. The thickness dependence, polarized and incident angle dependence of SHG signal from CuttbPc LB films are calculated. The results of calculation show a good agreement with the experimental data. It is shown that electrostatic phenomena at the interface is correlated closely with SHG signal, and the SHG measurement is also a helpful tool for the detection of the space charge field at the interface.
Keywords:SHG  phthalocyanine  LB film  interface  electrostatic phenomena  
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