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Electromagnetic energy vortex associated with sub-wavelength plasmonic Taiji marks
Wei Ting Chen1, Pin Chieh Wu, Chen Jung Chen
1Department of Physics, National Taiwan University, Taipei, Taiwan.
Optics Express
|October 14, 2010
Summary
Researchers fabricated gold Taiji nano-structures and studied their plasmonic resonances. A unique vortex-like Poynting vector profile was observed in one structure due to its specific design.
Area of Science:
- Plasmonics
- Nanotechnology
- Optical Metamaterials
Background:
- The Taiji symbol, an ancient oriental emblem, represents complementary opposing forces.
- Nano-fabrication techniques enable the creation of complex structures at the nanoscale.
Purpose of the Study:
- To investigate the plasmonic resonances of Taiji nano-structures.
- To explore the optical properties of these unique nanostructures.
Main Methods:
- Fabrication of a 70x70 array of gold Taiji marks (30 nm thickness) using electron beam lithography on a fused silica substrate.
- Characterization of plasmonic resonances through experimental measurements and numerical simulations under normal illumination.
- Analysis of Poynting vector profiles for different Taiji nano-structure configurations.
Main Results:
- Successful fabrication of Taiji nano-structures with precise dimensions (500 nm diameter, 700 nm array period).
- Observation of plasmonic resonances in the fabricated nano-structures.
- Identification of a specific Taiji nano-structure exhibiting a vortex-like Poynting vector profile.
Conclusions:
- The unique geometry of the Taiji symbol can lead to interesting optical phenomena, such as vortex-like energy flow.
- Taiji nano-structures offer a novel platform for exploring plasmonic effects and potential applications in optics and photonics.
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