研究目的
Investigating the compatibility of metallic Sierpiński fractal metastructures for both surface-enhanced Raman spectroscopy and second-harmonic generation.
研究成果
The study demonstrated that metallic Sierpiński fractal metastructures can be used for both surface-enhanced Raman spectroscopy and second-harmonic generation. Functionalization with p-NTP enhanced the SHG activity, although the enhancement was localized and modest. Future studies could explore molecules with better electron delocalization and higher hyperpolarizability for stronger enhancements.
研究不足
The study is limited by the diffraction-limited spatial resolution in microspectroscopy measurements, which prevents resolving metastructures smaller than G5. Additionally, the SHG enhancement is localized to confined regions around the nanotriangles, and the overall increase in SHG signal is modest.
1：Experimental Design and Method Selection:
The study involved the fabrication of metallic Sierpiński fractal metastructures using electron-beam lithography and their characterization for surface-enhanced Raman spectroscopy and second-harmonic generation.
2：Sample Selection and Data Sources:
The samples were gold nanoprisms arranged in Sierpiński fractal patterns up to the eighth-order generation.
3：List of Experimental Equipment and Materials:
Equipment included a LEO 1530 field emission scanning electron microscope for e-beam lithography, a Renishaw inVia Raman spectrometer for SERS measurements, and a Coherent Mira 900f pulsed laser for SHG microscopy. Materials included gold and titanium for the nanostructures and p-Nitrothiophenol for functionalization.
4：Experimental Procedures and Operational Workflow:
The structures were fabricated, functionalized with p-NTP, and then characterized using SERS and SHG microscopy.
5：Data Analysis Methods:
Data analysis included principle component analysis for SERS maps and quadratic fitting for SHG power dependence.
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