Broadband, High-Speed, and Large-Amplitude Dynamic Optical Switching with Yttrium-Doped Cadmium Oxide

Soham Saha, Benjamin T. Diroll, Joshua Shank, Zhaxylyk Kudyshev, Aveek Dutta, Sarah Nahar Chowdhury, Ting Shan Luk, Salvatore Campione, Richard D. Schaller, Vladimir M. Shalaev, Alexandra Boltasseva*, Michael G. Wood

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations

Abstract

Transparent conducting oxides, such as doped indium oxide, zinc oxide, and cadmium oxide (CdO), have recently attracted attention as tailorable materials for applications in nanophotonic and plasmonic devices such as low-loss modulators and all-optical switches due to their tunable optical properties, fast optical response, and low losses. In this work, optically induced extraordinarily large reflection changes (up to 135%) are demonstrated in bulk CdO films in the mid-infrared wavelength range close to the epsilon near zero (ENZ) point. To develop a better understanding of how doping level affects the static and dynamic optical properties of CdO, the evolution of the optical properties with yttrium (Y) doping is investigated. An increase in the metallicity and a blueshift of the ENZ point with increasing Y-concentrations is observed. Broadband all-optical switching from near-infrared to mid-infrared wavelengths is demonstrated. The major photoexcited carrier relaxation mechanisms in CdO are identified and it is shown that the relaxation times can be significantly reduced by increasing the dopant concentration in the film. This work could pave the way to practical dynamic and passive optical and plasmonic devices with doped CdO spanning wavelengths from the ultraviolet to the mid-infrared region.

Original languageEnglish (US)
Article number1908377
JournalAdvanced Functional Materials
Volume30
Issue number7
DOIs
StatePublished - Feb 1 2020

Keywords

  • all optical switching
  • cadmium oxide
  • epsilon near zero
  • high mobility transparent conducting oxide
  • mid infrared plasmonics

ASJC Scopus subject areas

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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    Saha, S., Diroll, B. T., Shank, J., Kudyshev, Z., Dutta, A., Chowdhury, S. N., Luk, T. S., Campione, S., Schaller, R. D., Shalaev, V. M., Boltasseva, A., & Wood, M. G. (2020). Broadband, High-Speed, and Large-Amplitude Dynamic Optical Switching with Yttrium-Doped Cadmium Oxide. Advanced Functional Materials, 30(7), [1908377]. https://doi.org/10.1002/adfm.201908377