研究目的
Investigating the enhancement of the second harmonic signal of nonlinear crystals by self-assembled gold nanoparticles.
研究成果
The hybrid system of LiNbO3 patterned with self-assembled, electrochemically size-tuned gold nanoparticles shows a pronounced enhancement of about 60-fold SHG compared to the bare crystal within the confocal volume of a laser spot. This enhancement is attributed to the resonant plasmonic behavior of the gold nanoparticles and their interaction with the nonlinear crystal.
研究不足
The study is limited by the technical constraints of the fabrication process and the optical characterization setup. Potential areas for optimization include the control of nanoparticle size and spacing, and the enhancement of the SHG signal.
1：Experimental Design and Method Selection:
The study employs a hybrid system consisting of a nonlinear crystal with a dense coverage of plasmonic nanostructures. The method of self-assembled diblock-copolymer-based micellar lithography with subsequent electroless deposition is used to cover the whole surface of a lithium niobate (LiNbO3) crystal.
2：Sample Selection and Data Sources:
z-cut LiNbO3 crystals are used as substrates. The size of the gold nanoparticles is controlled and optimized by the electroless deposition process.
3：List of Experimental Equipment and Materials:
A femtosecond laser, parabolic mirror setup, scanning electron microscopy (SEM), dark-field setup, and Andor Shamrock SR-303i spectrometer with an iDus DU416A-LDC-DD detector are used.
4：Experimental Procedures and Operational Workflow:
The fabrication process involves cleaning the substrates, spin-coating a solution of gold-loaded diblock copolymers, oxygen plasma treatment, and electroless deposition. Optical characterization is performed using a dark-field setup and a parabolic mirror setup.
5：Data Analysis Methods:
The size of the gold nanoparticles is determined using a blob detection program. The SHG intensities are evaluated for all gold nanoparticle sizes.
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