研究目的
Investigating the plasmonic hybridization in silver nanostructures using high-resolution electron energy loss spectroscopy (EELS) to understand the coupling of resonant modes in closely-spaced nanostructures.
研究成果
The study demonstrates the ability to resolve multiple hybrid plasmon resonances in silver nanostructures with high energy resolution, extending the detectable energy range down to the mid-infrared region. The results suggest that arrays do not require perfect resonance matching for enhancement effects to be observable.
研究不足
The study is limited by the energy resolution of EELS and the need for deconvolution to extend the range of detectable energies down to the mid-infrared region. Minor asymmetries in the nanoantennas may shift their individual resonant frequencies.
1：Experimental Design and Method Selection:
The study uses electron beam lithography to fabricate circular arrays of rods and silver nano-square dimers on silicon nitride membranes. High-resolution spectral images of SPR modes are acquired using an ultrastable STEM-TEM system equipped with an electron monochromator and high-resolution electron energy loss spectrometer. The iterative Richardson-Lucy deconvolution is applied to increase energy resolution.
2：Sample Selection and Data Sources:
Samples include circular arrays of rods and 30 nm high silver nano-square dimers on 50 nm thick silicon nitride membranes.
3：List of Experimental Equipment and Materials:
FEI Titan 80-300 STEM-TEM system, electron monochromator, high-resolution electron energy loss spectrometer.
4：Experimental Procedures and Operational Workflow:
Spectral images of SPR modes are acquired at 80 keV with an energy resolution of 80 meV, further enhanced to 40 meV through deconvolution.
5：Data Analysis Methods:
The iterative Richardson-Lucy deconvolution is used to analyze the spectra, identifying multiple plasmon peaks.
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