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.
Physica Status Solidi: Rapid Research Letters, Vol. 5, no. 5 (2011), pp. 175-177
Copyright © 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Thisthe pre-peer reviewed version of the following article: Rosa, L., Sun, K. & Juodkazis, S. (2011). â€˜Sierpinski fractal plasmonic nanoantennasâ€™, Physical Status Solidi: Rapid Research Letters, 5(5-6), 175-177, which has been published in final form at http://dx.doi.org/10.1002/pssr.201105136. The accepted manuscript is reproduced in accordance with the copyright policy of the publisher.