1. Quantifying the radiation efficiency of nano antennas
- Author
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Amir Boag, Jacob Scheuer, Yuval Yifat, Inbal Friedler, Michal Eitan, Zeev Iluz, and Yael Hanein
- Subjects
Materials science ,Physics and Astronomy (miscellaneous) ,Directional antenna ,business.industry ,Scattering ,Bandwidth (signal processing) ,Radiation ,Finite element method ,Antenna efficiency ,Optics ,Nano ,Optoelectronics ,business ,Spectroscopy ,Computer Science::Information Theory - Abstract
The radiation efficiency of nano antennas is a critical parameter determining their suitability for various applications. To that end, the radiation efficiency of a single antenna is directly quantified using far-field measurements of the reflectance of an array comprising identical nano-antennas. Excellent agreement in terms of resonance frequencies, optical bandwidth, and scattering efficiency is found between the results of experimental measurements and finite element-based numerical analysis of scattering from Au nano-antenna arrays. Extremely high overall radiation efficiencies, exceeding 82%, are obtained. The high efficiency can facilitate the employment of such nano-antennas for applications in imaging, spectroscopy, and solar energy harvesting.
- Published
- 2012
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