Journal
APPLIED PHYSICS LETTERS
Volume 94, Issue 26, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3168498
Keywords
diffraction gratings; electromagnetic fields; plasmonics; surface enhanced Raman scattering; surface plasmon resonance
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Funding
- Defense Advanced Research Projects Agency (DARPA) [HR0011-09-3-0002]
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We present a rational approach toward amplifying the local electromagnetic (EM) field for surface enhanced Raman spectroscopy applications by integrating dielectric gratings capable of guided mode resonance with plasmonic optical antennas. The optical antennas are placed periodically at certain positions on the surface of a two-dimensional (2D) dielectric grating. At resonance, the grating provides a spatially confined, enhanced EM field that can further enhance the strong field of the localized surface plasmon on the nanoantenna. The numerical simulations demonstrate a cascaded enhancement from the optical antenna and the dielectric grating when the two are weakly coupled.
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