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26 July 2016 Near-infrared plasmonics with transparent conducting oxides (Conference Presentation)
Jongbum Kim, Nathaniel Kinsey, Clayton DeVault, Aveek Dutta, Marcello Ferrera, Vladimir Shalaev, Alexandra Boltasseva
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Proceedings Volume 9883, Metamaterials X; 98830X (2016) https://doi.org/10.1117/12.2228334
Event: SPIE Photonics Europe, 2016, Brussels, Belgium
Abstract
As a result of the significant attention in searching for alternative plasmonic materials for real-life nanophotonic devices, transparent conducting oxides (TCOs) have been proposed as promising constituent building blocks for telecommunication wavelengths. They are eminently practical materials because they are CMOS-compatible, can be grown on many different types of substrates, patterned by standard fabrication procedures, and integrated with many other standard technologies. Due to the ability of TCO nanostructures to support strong plasmonic resonance in the near infrared (NIR), metasurface devices, such as a quarter wave plate, have been demonstrated whose properties can be easily adjustable with post processing such as thermal annealing. Additionally, TCOs can be used as epsilon near zero (ENZ) materials in the NIR. From our recent study of the behavior of nanoantennae sitting upon a TCO substrate, we found that TCOs serve as an optical insulating media due to the high impedance of TCOs at the ENZ frequency, enabling emission shaping. Finally, the optical properties of TCOs can be varied by optical or electrical means. Current research is focused on studying the ultrafast carrier dynamics in doped zinc oxide films using pump-probe spectroscopy. We have shown that aluminum doped zinc oxide films can achieve a 40% change in reflection with ultrafast dynamics (<1ps) under a small fluence of 3mJ/cm2. Consequently, TCOs are shown to be extremely flexible materials, enabling fascinating physics and unique devices for applications in the NIR regime.
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Jongbum Kim, Nathaniel Kinsey, Clayton DeVault, Aveek Dutta, Marcello Ferrera, Vladimir Shalaev, and Alexandra Boltasseva "Near-infrared plasmonics with transparent conducting oxides (Conference Presentation)", Proc. SPIE 9883, Metamaterials X, 98830X (26 July 2016); https://doi.org/10.1117/12.2228334
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KEYWORDS
Near infrared
Plasmonics
Transparent conducting oxide
Standards development
Transparent conductors
Zinc oxide
Nanolithography
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