A combination of concave/convex surfaces for field-enhancement optimization: the indented nanocone

• We introduce a design strategy to maximize the Near Field (NF)enhancement on plasmonic antennas. We start by identifying and studyingthe basic electromagnetic effects that contribute to the electric near fieldenhancement. On a second step, we show how the concatenation of a convexand a concave surface allows merging all the effects on a single, continuousnanoantenna. As an example of this NF maximization strategy, we engineera nanostructure, the indented nanocone. This structure, combines all thestudied NF maximization effects with a synergistic boost provided bya Fano-like interference effect activated by the presence of the concavesurface. As a result, the antenna exhibits a NF amplitude enhancement of 800, which transforms into 1600 when coupled to a perfect metallicsurface. This strong enhancement makes the proposed structure a robustcandidate to be used in field enhancement based technologies. Furtherelaborations of the concept may produce even larger and more effectiveenhancements.

Subject headings

TEKNIK OCH TEKNOLOGIER  -- Nanoteknik (hsv//swe)

ENGINEERING AND TECHNOLOGY  -- Nano-technology (hsv//eng)

Publication and Content Type

art (subject category)

ref (subject category)