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5 March 2021 Extraordinary permittivity modulation in zinc oxide for dynamic nanophotonics
Soham Saha, Aveek Dutta, Clayton T. DeVault, Benjamin T. Diroll, Richard D. Schaller, Zhaxylyk A. Kudyshev, Alexander V. Kildishev, Vladimir M. Shalaev, Alexandra Boltasseva
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Proceedings Volume 11687, Oxide-based Materials and Devices XII; 1168719 (2021) https://doi.org/10.1117/12.2582397
Event: SPIE OPTO, 2021, Online Only
Abstract
Dynamic control over the permittivity of materials enables control over the amplitude, phase, and polarization of light. Thus, to realize practical tunable devices, it is important to perform a detailed dynamic characterization of technology-relevant materials with substantially tunable optical properties. In this work, we demonstrate extraordinarily large, unity-order permittivity modulation in zinc oxide through interband pumping. The large permittivity changes actively enable large reflectance modulation in both lithography-free mirrors (70% at 31.6 mJ/cm2 pump) and nanodisk resonators (55% at 7.6 mJ/cm2 pump fluence). The relaxation time for this response is 20 ps. We explore the physical origins of the permittivity modulation and determine the physical limits. The results of this study will advance the realization of ultrafast dynamic optical devices for optical switching, beam-steering, and spectroscopy.
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Soham Saha, Aveek Dutta, Clayton T. DeVault, Benjamin T. Diroll, Richard D. Schaller, Zhaxylyk A. Kudyshev, Alexander V. Kildishev, Vladimir M. Shalaev, and Alexandra Boltasseva "Extraordinary permittivity modulation in zinc oxide for dynamic nanophotonics", Proc. SPIE 11687, Oxide-based Materials and Devices XII, 1168719 (5 March 2021); https://doi.org/10.1117/12.2582397
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KEYWORDS
Modulation
Zinc oxide
Nanophotonics
Transparent conducting oxide
Spectroscopes
Switching
Telecommunications
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