Efficient absorption of visible radiation by gap plasmon resonators

Michael Grøndahl Nielsen, Anders Pors, Ole Albrektsen, Sergey I. Bozhevolnyi

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Abstrakt

We demonstrate experimentally a periodic array of differently-sized and circularly-shaped gap plasmon resonators (GPRs) with the average absorption ~94% for unpolarized light in the entire visible wavelength range (400-750nm). Finite-element simulations verify that the polarization insensitive broadband absorption originates from localized gap surface plasmons whose resonant excitations only weakly depend on the angle of incidence. Arrays of GPRs also exhibit enhanced local field intensities (~115) as revealed by scanning two-photon photoluminescence microscopy, that are spectrally correlated with the minima in corresponding linear reflection spectra.
OriginalsprogEngelsk
TidsskriftOptics Express
Vol/bind20
Udgave nummer12
Sider (fra-til)13311-13319
ISSN1094-4087
DOI
StatusUdgivet - 2012

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