研究目的
Investigating the amplification of nonlinear operations due to NLO active polymer layers grown on metal surfaces for enhancing surface plasmon polaritons.
研究成果
The introduction of the NLO polymer layer was useful for further amplifying the SP-enhanced nonlinear susceptibilities of the Ag surfaces. The optimal thickness for the highest SHG was determined by the balance between the nonlinear light-matter interaction length and the destructive interferences inside the NLO polymer layer.
研究不足
The study is limited by the thickness of the NLO polymer layer and the destructive interference of SHG waves at wider d2, which affects the SHG intensity.
1：Experimental Design and Method Selection:
Second harmonic generation (SHG) spectroscopy was conducted with NLO polymer/Ag/BK7 glass prism structure. The SP polaritons on the Ag surfaces were coupled with excitation lights in Kretschmann geometry.
2：Sample Selection and Data Sources:
The NLO polymers consisted of guest-host hybrid materials, with Disperse Red 1 as the guest chromophores and PMMA as the host polymer.
3：List of Experimental Equipment and Materials:
Ag layer and NLO polymer layers with thicknesses d1=45 nm and d2=0-80 nm, respectively.
4：Experimental Procedures and Operational Workflow:
Excitation femtosecond optical pulses at 780 nm were irradiated on the Ag surfaces at different angles of incidence. The SHG signals were obtained in the reflection geometry.
5：Data Analysis Methods:
The nonlinear optical responses were analyzed with a transfer matrix technique and a Green-function analysis.
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