Journal
APPLIED PHYSICS LETTERS
Volume 98, Issue 15, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3581886
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Using a simple and intuitive analytical approach, we perform optimization of a nanolens composed of coupled metal nanoparticles capable of subwavelength focusing of light inside the narrow gap separating the particles. Specifically, we optimize the structure of two nanospheres of different sizes to achieve maximum field enhancement at an off-center position in the gap. We demonstrate that the nanolens of two or more spheres acts simultaneously as an efficient antenna with large dipole and an efficient cavity with small effective volume. (C) 2011 American Institute of Physics. [doi:10.1063/1.3581886]
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