Optical properties of electrically connected plasmonic nanoantenna dimer arrays

Darin Todd Zimmerman, Benjamin D. Borst, Cassandra J. Carrick, Joseph M. Lent, Raymond A. Wambold, Gary Weisel, Brian G. Willis

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We fabricate electrically connected gold nanoantenna arrays of homodimers and heterodimers on silica substrates and present a systematic study of their optical properties. Electrically connected arrays of plasmonic nanoantennas make possible the realization of novel photonic devices, including optical sensors and rectifiers. Although the plasmonic response of unconnected arrays has been studied extensively, the present study shows that the inclusion of nanowire connections modifies the device response significantly. After presenting experimental measurements of optical extinction for unconnected dimer arrays, we compare these to measurements of dimers that are interconnected by gold nanowire "busbars." The connected devices show the familiar dipole response associated with the unconnected dimers but also show a second localized surface plasmon resonance (LSPR) that we refer to as the "coupled-busbar mode." Our experimental study also demonstrates that the placement of the nanowire along the antenna modifies the LSPR. Using finite-difference time-domain simulations, we confirm the experimental results and investigate the variation of dimer gap and spacing. Changing the dimer gap in connected devices has a significantly smaller effect on the dipole response than it does in unconnected devices. On the other hand, both LSPR modes respond strongly to changing the spacing between devices in the direction along the interconnecting wires. We also give results for the variation of E-field strength in the dimer gap, which will be important for any working sensor or rectenna device.

Original languageEnglish (US)
Article number063101
JournalJournal of Applied Physics
Volume123
Issue number6
DOIs
StatePublished - Feb 14 2018

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dimers
optical properties
surface plasmon resonance
nanowires
spacing
gold
dipoles
rectifiers
optical measuring instruments
coupled modes
field strength
extinction
antennas
wire
photonics
inclusions
silicon dioxide
sensors
simulation

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Zimmerman, D. T., Borst, B. D., Carrick, C. J., Lent, J. M., Wambold, R. A., Weisel, G., & Willis, B. G. (2018). Optical properties of electrically connected plasmonic nanoantenna dimer arrays. Journal of Applied Physics, 123(6), [063101]. https://doi.org/10.1063/1.5008511
Zimmerman, Darin Todd ; Borst, Benjamin D. ; Carrick, Cassandra J. ; Lent, Joseph M. ; Wambold, Raymond A. ; Weisel, Gary ; Willis, Brian G. / Optical properties of electrically connected plasmonic nanoantenna dimer arrays. In: Journal of Applied Physics. 2018 ; Vol. 123, No. 6.
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Zimmerman, DT, Borst, BD, Carrick, CJ, Lent, JM, Wambold, RA, Weisel, G & Willis, BG 2018, 'Optical properties of electrically connected plasmonic nanoantenna dimer arrays', Journal of Applied Physics, vol. 123, no. 6, 063101. https://doi.org/10.1063/1.5008511

Optical properties of electrically connected plasmonic nanoantenna dimer arrays. / Zimmerman, Darin Todd; Borst, Benjamin D.; Carrick, Cassandra J.; Lent, Joseph M.; Wambold, Raymond A.; Weisel, Gary; Willis, Brian G.

In: Journal of Applied Physics, Vol. 123, No. 6, 063101, 14.02.2018.

Research output: Contribution to journalArticle

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AU - Zimmerman, Darin Todd

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