Research Papers

Tunable plasmonic response of metallic nanoantennna heterodimer arrays modified by atomic-layer deposition

[+] Author Affiliations
Raymond A. Wambold, Darin T. Zimmerman

The Pennsylvania State University, Department of Materials Science and Engineering, 221 Steidle Building, University Park, Pennsylvania 16802, United States

Penn State Altoona, Department of Physics, 3000 Ivyside Park, Altoona, Pennsylvania 16601, United States

Benjamin D. Borst, Gary J. Weisel

Penn State Altoona, Department of Physics, 3000 Ivyside Park, Altoona, Pennsylvania 16601, United States

Jie Qi, Brian G. Willis

University of Connecticut, Department of Chemical and Biomolecular Engineering, 191 Auditorium Road, Storrs, Connecticut 06269, United States

J. Nanophoton. 10(2), 026024 (Jun 06, 2016). doi:10.1117/1.JNP.10.026024
History: Received February 18, 2016; Accepted May 9, 2016
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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.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Raymond A. Wambold ; Benjamin D. Borst ; Jie Qi ; Gary J. Weisel ; Brian G. Willis, et al.
"Tunable plasmonic response of metallic nanoantennna heterodimer arrays modified by atomic-layer deposition", J. Nanophoton. 10(2), 026024 (Jun 06, 2016). ; http://dx.doi.org/10.1117/1.JNP.10.026024


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