Plasmonic channel waveguides in random arrays of metallic nanoparticles

Bidragets oversatte titel: Plasmoniske kanal bølgeledere i tilfældige mønstre af metal nanopartikler

Eduardo Pisano, Victor Coello, César Eduardo García Ortíz, Yiting Chen, Jonas Beermann, Sergey I. Bozhevolnyi

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We report detailed characterization of surface plasmon-polariton guiding along 1-, 1.5- and 2-μm-wide channels in high-density (~75 μm−2) random arrays of gold 70-nm-high and 50-nm-wide nanoparticles fabricated on a 70-nm-thin gold film supported by a 170-μm-thick silica substrate. The mode propagation losses, effective index dispersion, and scattering parameters are characterized using leakage-radiation microscopy, in direct and Fourier planes, in the wavelength range of 740–840 nm. It is found that the mode supported by 2-μm-wide channels propagates over > 10 μm in straight waveguides, with the corresponding S-bends and Y-splitters functioning reasonably well. The results show that the SPP waves can efficiently be guided by narrow scattering-free channels cut through randomly corrugated surface regions. The potential of this waveguiding mechanism is yet to be fully explored by tuning the scattering mean-free path and localization length via the density and size of random nanoparticles. Nevertheless, the results obtained are encouraging and promising diverse applications of these waveguide components in plasmonic circuitry.
Bidragets oversatte titelPlasmoniske kanal bølgeledere i tilfældige mønstre af metal nanopartikler
TidsskriftOptics Express
Udgave nummer15
Sider (fra-til)17080-17089
StatusUdgivet - 2016

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