Abstract
We present fabrication, characterization, and simulation results on an optical antenna inspired by the Sierpinski carpet fractal geometry for operation in the visible and near-infrared wavelength regions. Measurements and simulations of the far-field scattering efficiency indicate a broadband optical response. Two-photon photoluminescence images provide maps of the near-field intensity distribution, from which we extract an enhancement factor of ∼70. To explore the effect of morphology on the optical response of a large assembly of particles, we also present results on an arbitrarily chosen pseudo-random configuration as well as a periodic array.
Highlights
Plasmonic optical antennas use localized surface plasmon resonances in metal nanostructures to interface efficiently between propagative light and localized electromagnetic fields [1,2,3]
Experimental results reveal a broad signal that peaks at ∼660 nm, which is close to the result found in the numerical simulations. To determine whether this spectral response is due to the Sierpinski carpet morphology or just due to many monomers in close proximity, we explore the pseudo-random and periodic structures
We characterized the Sierpinski carpet gold nanostructure, fabricated from single crystalline gold flakes, demonstrating its potential to serve as a broadband optical antenna
Summary
Plasmonic optical antennas use localized surface plasmon resonances in metal nanostructures to interface efficiently between propagative light and localized electromagnetic fields [1,2,3]. The optical extinction cross section of a metal nanoparticle can be significantly larger than its physical cross section. Optical antennas have attracted a lot of attention in light harvesting-related applications such as photo detection [6, 7], solar cells [5, 8], and surface-enhanced Raman spectroscopy [9]
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