Tunable and low-loss correlated plasmons in Mott-like insulating oxides

Teguh Citra Asmara, Dongyang Wan, Yongliang Zhao, Muhammad Aziz Majidi, Christopher T. Nelson, Mary C. Scott, Yao Cai, Bixing Yan, Daniel Schmidt, Ming Yang, Tao Zhu, Paolo E. Trevisanutto, Mallikarjuna R. Motapothula, Yuan Ping Feng, Mark B. H. Breese, Matthew Sherburne, Mark Asta, Andrew Minor, T. Venkatesan () and Andrivo Rusydi ()
Additional contact information
Teguh Citra Asmara: NUSNNI-NanoCore, National University of Singapore
Dongyang Wan: NUSNNI-NanoCore, National University of Singapore
Yongliang Zhao: NUSNNI-NanoCore, National University of Singapore
Muhammad Aziz Majidi: Singapore Synchrotron Light Source, National University of Singapore
Christopher T. Nelson: University of California
Mary C. Scott: University of California
Yao Cai: University of California
Bixing Yan: NUSNNI-NanoCore, National University of Singapore
Daniel Schmidt: Singapore Synchrotron Light Source, National University of Singapore
Ming Yang: Singapore Synchrotron Light Source, National University of Singapore
Tao Zhu: Singapore Synchrotron Light Source, National University of Singapore
Paolo E. Trevisanutto: Singapore Synchrotron Light Source, National University of Singapore
Mallikarjuna R. Motapothula: NUSNNI-NanoCore, National University of Singapore
Yuan Ping Feng: National University of Singapore
Mark B. H. Breese: NUSNNI-NanoCore, National University of Singapore
Matthew Sherburne: University of California
Mark Asta: University of California
Andrew Minor: University of California
T. Venkatesan: NUSNNI-NanoCore, National University of Singapore
Andrivo Rusydi: NUSNNI-NanoCore, National University of Singapore

Nature Communications, 2017, vol. 8, issue 1, 1-11

Abstract: Abstract Plasmonics has attracted tremendous interests for its ability to confine light into subwavelength dimensions, creating novel devices with unprecedented functionalities. New plasmonic materials are actively being searched, especially those with tunable plasmons and low loss in the visible–ultraviolet range. Such plasmons commonly occur in metals, but many metals have high plasmonic loss in the optical range, a main issue in current plasmonic research. Here, we discover an anomalous form of tunable correlated plasmons in a Mott-like insulating oxide from the Sr1−xNb1−yO3+δ family. These correlated plasmons have multiple plasmon frequencies and low loss in the visible–ultraviolet range. Supported by theoretical calculations, these plasmons arise from the nanometre-spaced confinement of extra oxygen planes that enhances the unscreened Coulomb interactions among charges. The correlated plasmons are tunable: they diminish as extra oxygen plane density or film thickness decreases. Our results open a path for plasmonics research in previously untapped insulating and strongly-correlated materials.

Date: 2017
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DOI: 10.1038/ncomms15271

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