Analysis of the Surface Potentials and the Characters of Optical Second Harmonic Generation at the CuttbPc LB Film/Metal Interface
- Received Date: 2004-03-26
- Coppertetra-tert-butylPhthalocyanine, Langmuir-Blodgett film/metal interface, Kelvin probe, Surface electricpotential, Optical second harmonic generation, Space charge induced electricfield /
Abstract: Using the Kelvin probe and the optical second harmonic generation (SHG) measurement, the Space charged phenomenon and the non-linear optical effects at the interfaces of the coppertetra-tert-butyl phthalocyanine (CuttbPc) Langmuir-Blodgett (LB) film deposited on a metal (AlorAu) coated glass slide substrate were in vestigated. The surface potentials decreaseas the film thickness increases and eventually approaches a saturated value. The SHG has been detected although there is a centro-symmetric systemin the Cuttb Pcmolecular, and avery strong SH signal can be investigated at 1260 nm band for Cuttb Pc/Al samples. According to a proposed physical model for Cuttb PcLB film/metal, the nonlinear mechanism were analyzed by using electromagnetic wave theory. It is considered that the enhanced SH peak of CuttbPc/Al is attributed to the strong surface potential aroused by SCIEF at the interface, and shows that the production of SH signal is correlated closely with the electrostatic phenomena at the interface.
|Citation:||Cheng Xiaoman, Yao Suwei. Analysis of the Surface Potentials and the Characters of Optical Second Harmonic Generation at the CuttbPc LB Film/Metal Interface[J]. Chinese Journal of Chemical Physics , 2004, 17(5): 597-601. doi: 10.1088/1674-0068/17/5/597-601|