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
Analysis of Second-Harmonic Generation from CuttbPc LB Film/Metal Interface
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
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.
2004, Vol. 21 
