Localization of Near-Field Resonances in Bowtie Antennae: Influence of Adhesion Layers |
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Authors: | Xiaojin Jiao Jeremy Goeckeritz Steve Blair Mark Oldham |
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Institution: | (1) Department of Electrical and Computer Engineering, University of Utah, Salt Lake City, UT 84112, USA;(2) Applied Biosystems, Applera Corporation, 850 Lincoln Center Drive, Foster City, CA 94404, USA |
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Abstract: | The near-field resonances of gold bowtie antennae are numerically modeled. Besides the short-range surface plasmon polariton
(SR-SPP) mode along the main axis of the structure, a coupled SPP mode is also found in the gap region (G-SPP). The influence
of adhesion layers is considered, which depends on the refractive index and the absorption of the adhesion material and whether
it is continuous or etched. A high refractive index causes the peak of the SR-SPP to red-shift. High absorption quenches the
intensity of the SR-SPP. The magnitude of influence depends on the overlap of the adhesion layer with the SR-SPP and G-SPP
modes. The near-field resonance of the SPP mode on the top surface is also considered. An etched metal adhesion layer changes
the near-field localization in the gap and causes the enhancement peaks at different heights within the gap to red-shift from
top to bottom. A simple optimization method for the near-field localization by the combination of different top and bottom
layers is demonstrated. |
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Keywords: | Bowtie antennae Surface plasmons Adhesion layers |
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