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Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation
Published on: September 27, 2011
Efficient coupling and field enhancement for the nano-scale: plasmonic needle
Alexander Normatov1, Pavel Ginzburg, Nikolai Berkovitch
1EE department, Technion - Israel Institute of Technology, Technion City, Haifa, Israel.
Optics Express
|July 1, 2010
Summary
This study demonstrates efficient light coupling and power concentration using a plasmonic needle, achieving significant field enhancement for potential applications in nanoscale optics.
Area of Science:
- Plasmonics
- Nanophotonics
- Electromagnetism
Background:
- Efficiently concentrating light at the nanoscale is crucial for various optical applications.
- Plasmonic nanostructures offer a pathway to manipulate light beyond the diffraction limit.
Purpose of the Study:
- To theoretically demonstrate efficient coupling and power concentration of radially-polarized light onto a plasmonic needle tip.
- To investigate the electromagnetic field enhancement achieved by this configuration.
Main Methods:
- Utilizing Finite Elements (FE) and Finite-Difference-Time-Domain (FDTD) methods to evaluate electromagnetic field distribution.
- Simulating light interaction with a metallic needle at the center of a radial plasmonic grating.
Main Results:
- Significant electromagnetic field enhancement observed at the needle tip compared to the incident field.
- Power enhancement reached approximately 10^4, exhibiting resonant behavior with needle length.
- Fabrication of test samples for characterization was successful.
Conclusions:
- The proposed plasmonic needle structure enables highly efficient light concentration.
- The resonant power enhancement suggests tunability for specific applications.
- This work provides a foundation for advanced plasmonic devices.
