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Plasmonic focusing lens based on single-turn nano-pinholes array
Optics Express
|July 21, 2015
Summary
Researchers developed a simplified plasmonic lens using nano-pinholes. This miniature device, operating in the visible spectrum, achieves on-axis beaming and centrosymmetric focusing under circular polarized light.
Area of Science:
- Photonics
- Plasmonics
- Nanotechnology
Background:
- Plasmonic lenses offer miniaturization potential for optical devices.
- On-axis beaming and controlled focusing are crucial for photonic applications.
Purpose of the Study:
- To propose and investigate a miniature, simplified, planar plasmonic lens.
- To analyze focusing properties under circular polarized (CP) light.
- To explore modulation of transmitting fields for enhanced transmission and depth of focus.
Main Methods:
- Systematic investigation in the visible spectrum.
- Finite Element Method (FEM) simulations.
- Analysis of varying parameters: radius, dielectric, and number of pinholes.
Main Results:
- Demonstrated centrosymmetric focusing spot under CP illumination.
- Achieved enhanced transmission and elongated depth of focus.
- Successfully modulated transmitting fields by manipulating dielectric and wavelength.
Conclusions:
- The miniature plasmonic lens enables effective on-axis beaming and focusing.
- The device shows potential for fiber-end planar photonic devices.
- Applications in biosensing and imaging are facilitated by its simplified design and controllable properties.
