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Plasmonic-cavity model for radiating nano-rod antennas
Liang Peng1, N Asger Mortensen2
11] Department of Electronic Engineering and Information Science, Hangzhou Dianzi University, Hangzhou, P. R. China [2] Department of Photonics Engineering, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.
Scientific Reports
|January 24, 2014
Summary
We present an analytical solution for nano-rod antennas, achieving over 70% radiation efficiency by optimizing rod radius and feeding. This work aids in engineering optical antenna systems.
Area of Science:
- Nanophotonics
- Antenna Theory
- Plasmonics
Background:
- Nano-rod antennas are crucial for optical applications.
- Understanding their radiation efficiency is key for device performance.
Purpose of the Study:
- To derive a general analytical solution for nano-rod antennas.
- To identify design parameters for maximizing radiation efficiency.
Main Methods:
- Utilizing cylindrical harmonics expansion for nano-rod analysis.
- Modeling metallic nano-rods as plasmonic cavities.
- Deriving closed-form expressions for fields, resonance, and efficiency.
Main Results:
- Achieved radiation efficiency up to 70% and higher.
- Identified large rod radius and central-fed profile as key for efficient radiation.
- Demonstrated the influence of plasmonic resonances on antenna performance.
Conclusions:
- The derived theoretical model provides a general framework for nano-rod antennas.
- Offers insights for engineering and optimizing optical antenna systems.
- Paves the way for improved radiation patterns and efficiency in optical devices.
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