Abstract
A highly tunable optical nanoantenna element is proposed through gradual transformation from a
sphere to a prolate spheroid. This new element induces field enhancement and an increase in resonance
frequency. Rather than a purely metallic material, we propose the use of a metal-coated dielectric spheroid as
a nanoelement because of its flexibility. We show that a spheroidal element enhances the near-field better
than its rod and sphere counterparts. As such, spheroidal elements are good candidates for improving
solar-cell performance.
© 2013 Chinese Optics Letters
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