研究目的
Investigating the coupling of linearly polarized light to radial plasmons for nanoscale light confinement and near-field imaging.
研究成果
The proposed fiber-plasmonic hybrid probe efficiently couples linearly polarized light to radial plasmons, creating a nano-scale hot-spot at the tip apex. This device offers a promising alternative for near-field microscopy, with potential for further enhancement through optimization of tip geometries and materials.
研究不足
The study relies on simulations, and practical implementation may face challenges in fabricating the precise geometry of the tip and aperture. The focusing efficiency, while promising, may require further optimization for specific applications.
1：Experimental Design and Method Selection:
The study uses finite difference time domain 3D simulations to demonstrate the efficient utilization of linearly polarized excitation to create a hot-spot at the apex of a gold tip.
2：Sample Selection and Data Sources:
The device consists of a single mode step index fiber coated with a 100 nm thick gold layer, featuring a rectangular aperture and a half-ellipsoid gold tip.
3：List of Experimental Equipment and Materials:
A gold-coated optical fiber with a specific geometry for the tip and aperture.
4：Experimental Procedures and Operational Workflow:
The light propagating along the fiber is incident on the tip's base, exciting surface plasmon polaritons through end-fire coupling.
5：Data Analysis Methods:
The spectral dependence of electric field magnitudes at the apex is calculated for varying tip lengths to confirm the contribution of cavity mode to field enhancement.
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