Journal article
A leaky-wave groove antenna at optical frequency
Journal of applied physics, v 112(7), p074320
01 Oct 2012
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
In the framework of nanoantennas functioning at optical frequencies, we present here a new kind of leaky-wave antenna realized as a groove in an aluminum superstrate, supported by a silver substrate. The antenna works in the optical frequency range where the silver acts as a dielectric with equivalent refractive index between zero and one. Under these conditions, the dominant mode launched in the structure exhibits a phase velocity larger than the speed of light in free-space, thus producing a leaky-wave radiation in free-space. We propose a simplified analytical form of the dispersion characteristic of the fundamental mode supported by the structure, which allows for identification of the radiative leaky-wave condition. We also propose approximate formulas for calculating the antenna gain and loss efficiency. The results obtained through these formulas are successfully compared with full-wave simulations. The final parametric study shows how the radiation characteristic is affected by the variation of geometric features. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757631]
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Details
- Title
- A leaky-wave groove antenna at optical frequency
- Creators
- Alessia Polemi - Drexel Univ, Philadelphia, PA 19104 USAStefano Maci - Univ Siena, Dept Informat Engn, I-53100 Siena, Italy
- Publication Details
- Journal of applied physics, v 112(7), p074320
- Publisher
- American Institute of Physics
- Number of pages
- 6
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- Mechanical Engineering and Mechanics
- Web of Science ID
- WOS:000310489400131
- Scopus ID
- 2-s2.0-84867525049
- Other Identifier
- 991019169519604721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Physics, Applied