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Journal of Nanophotonics

Tunable plasmonic response of metallic nanoantennna heterodimer arrays modified by atomic-layer deposition
Author(s): Raymond A. Wambold; Benjamin D. Borst; Jie Qi; Gary J. Weisel; Brian G. Willis; Darin T. Zimmerman
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Paper Abstract

We present a systematic study of tunable, plasmon extinction characteristics of arrays of nanoscale antennas that have potential use as sensors, energy-harvesting devices, catalytic converters, in near-field optical microscopy, and in surface-enhanced spectroscopy. Each device is composed of a palladium triangular-prism antenna and a flat counter-electrode. Arrays of devices are fabricated on silica using electron-beam lithography, followed by atomic-layer deposition of copper. Optical extinction is measured by employing a broadband light source in a confocal, transmission arrangement. We characterize the plasmon resonance behavior by examining the dependence on device length, the gap spacing between the electrodes, material properties, and the device array density, all of which contribute in varying degrees to the measured response. We employ finite-difference time-domain simulations to demonstrate good qualitative agreement between experimental trends and theory and use scanning electron microscopy to correlate plasmonic extinction characteristics with changes in morphology.

Paper Details

Date Published: 6 June 2016
PDF: 12 pages
J. Nanophoton. 10(2) 026024 doi: 10.1117/1.JNP.10.026024
Published in: Journal of Nanophotonics Volume 10, Issue 2
Show Author Affiliations
Raymond A. Wambold, The Pennsylvania State Univ. (United States)
Penn State Altoona (United States)
Benjamin D. Borst, Penn State Altoona (United States)
Jie Qi, Univ. of Connecticut (United States)
Gary J. Weisel, Penn State Altoona (United States)
Brian G. Willis, Univ. of Connecticut (United States)
Darin T. Zimmerman, The Pennsylvania State Univ. (United States)
Penn State Altoona (United States)

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