Infrared plasmonics via ZnO

J. W. Allen, M. S. Allen, D. C. Look, B. R. Wenner, Naho Itagaki, K. Matsushima, I. Surhariadi

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Abstract

Conventional plasmonic devices involve metals, but metal-based plasmonic resonances are mainly limited to λres < 1 μm, and thus metals interact effectively only with light in the UV and visible ranges. We show that highly doped ZnO can exhibit λres ≥ 1 μm, thus moving plasmonics into the IR range. We illustrate this capability with a set of thin (d = 25-147 nm) Al-doped ZnO (AZO) layers grown by RF sputtering on quartz glass. These samples employ a unique, 20-nmthick, ZnON buffer layer, which minimizes the strong thickness dependence of mobility (μ) on thickness (d). A practical waveguide structure, using these measurements, is simulated with COMSOL Multiphysics software over a mid-IR wavelength range of 4-10 μm, with a detailed examination of propagation loss and plasmon confinement dimension. In many cases, Lplas < λlight, thus showing that IR light can be manipulated in semiconductor materials at dimensions below the diffraction limit.

Original languageEnglish
Pages (from-to)109-119
Number of pages11
JournalJournal of Nano Research
Volume28
DOIs
Publication statusPublished - Jul 6 2014

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All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Physics and Astronomy(all)

Cite this

Allen, J. W., Allen, M. S., Look, D. C., Wenner, B. R., Itagaki, N., Matsushima, K., & Surhariadi, I. (2014). Infrared plasmonics via ZnO. Journal of Nano Research, 28, 109-119. https://doi.org/10.4028/www.scientific.net/JNanoR.28.109