Resonant-plasmon field enhancement from asymmetrically illuminated conical metallic-probe tips

Resonant-plasmon field enhancement from asymmetrically illuminated conical metallic-probe tips

Optical-field enhancement and confinement for an asymmetrically illuminated nanoscopic Au tip suspended over a planar Au substrate is investigated both numerically and experimentally. The spatial field distribution of the tip-sample system was calculated using the full 3D finite-difference time-doma...

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Veröffentlicht in:Optics express 2006-04, Vol.14 (7), p.2921-2931
Hauptverfasser: Roth, Ryan M, Panoiu, Nicolae C, Adams, Matthew M, Osgood, Richard M, Neacsu, Catalin C, Raschke, Markus B
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container_end_page 2931
container_issue 7
container_start_page 2921
container_title Optics express
container_volume 14
creator Roth, Ryan M
Panoiu, Nicolae C
Adams, Matthew M
Osgood, Richard M
Neacsu, Catalin C
Raschke, Markus B
description Optical-field enhancement and confinement for an asymmetrically illuminated nanoscopic Au tip suspended over a planar Au substrate is investigated both numerically and experimentally. The spatial field distribution of the tip-sample system was calculated using the full 3D finite-difference time-domain method. The calculation enables investigation of the effects of the substrate-tip placement, angle of incidence, and spectral response. The tip plasmon response leads to a significant (up to ~70 times) local field enhancement between the tip and substrate. The enhancement is found to be extremely sensitive to the tip-sample separation distance. Tip-enhanced Raman scattering experiments were performed and the numerical results provide a consistent description of the observed field localization and enhancement.
doi_str_mv 10.1364/OE.14.002921
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title Resonant-plasmon field enhancement from asymmetrically illuminated conical metallic-probe tips
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