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Sierpin´ski fractal plasmonic nanoantennas
Author(s) -
Rosa Lorenzo,
Sun Kai,
Juodkazis Saulius
Publication year - 2011
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.201105136
Subject(s) - plasmon , electron beam lithography , fractal , optics , sierpinski triangle , materials science , optoelectronics , physics , nanotechnology , resist , mathematical analysis , mathematics , layer (electronics)
We propose plasmonic Sierpiński gasket, a self‐replicating fractal, with structural elements spanning from ∼100 nm to ∼5 µm made by standard electron beam lithography (EBL), metal deposition, and lift‐off sequence. Such structures demonstrate light field enhancement from visible to far‐IR spectral range and can be scaled up towards THz band. Numerical simulations show that as the fractal order is increased, the optical extinction band broadens from the visible light towards far‐IR, achieving a light field enhancement of more than four orders of magnitude in the nano‐gap proximity. Such antennas are prospective for IR–THz filter, detection, and emission applications.Fundamental mode simulation of Sierpiński fourth‐order fractal gold nanoantenna with 10 nm nano‐gap, made by EBL and lift‐off. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)