6 June 2016 Tunable plasmonic response of metallic nanoantennna heterodimer arrays modified by atomic-layer deposition
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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.
© 2016 Society of Photo-Optical Instrumentation Engineers (SPIE)
Raymond A. Wambold, Benjamin D. Borst, Jie Qi, Gary J. Weisel, Brian G. Willis, Darin T. Zimmerman, "Tunable plasmonic response of metallic nanoantennna heterodimer arrays modified by atomic-layer deposition," Journal of Nanophotonics 10(2), 026024 (6 June 2016). https://doi.org/10.1117/1.JNP.10.026024 . Submission:
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