研究目的
To demonstrate the fabrication of gold nanorod dimer antennas with sub-6 nm gap distances using a combination of helium- and gallium-ion beam milling with a sketch-and-peel technique, and to characterize their optical properties, focusing on the quality factor and strong coupling between antenna arms.
研究成果
The sketch-and-peel technique enables the fabrication of plasmonic dimer antennas with gap sizes down to 5 nm and quality factors up to 14, demonstrating strong coupling between antenna arms. This approach offers a fast and reliable method for producing large-scale arrays of nanostructures with nanometer precision.
研究不足
The study is limited by the precision of ion beam milling techniques and the potential for ion implantation affecting material properties. The scalability of the sketch-and-peel technique for very large arrays may also present challenges.
1：Experimental Design and Method Selection:
The study combines helium- and gallium-ion beam milling with a sketch-and-peel technique for fabricating gold nanorod dimer antennas. Polarisation-resolved linear dark-field spectromicroscopy and finite-difference time-domain simulations were used for characterization.
2：Sample Selection and Data Sources:
Gold films deposited on fused silica substrates were annealed to increase grain size. Dimer antennas were fabricated with varying gap sizes.
3：List of Experimental Equipment and Materials:
FEI Helios Nanolab 600i dual-beam microscope, Zeiss Orion NanoFab He/Ne ion microscope, gold films, fused silica substrates.
4：Experimental Procedures and Operational Workflow:
Fabrication involved Ga-FIB and He-FIB milling followed by the sketch-and-peel technique. Optical characterization was performed using dark-field spectromicroscopy.
5：Data Analysis Methods:
Scattering spectra were analyzed to determine resonance wavelengths and quality factors. FDTD simulations supported experimental findings.
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