5 years ago

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

Tunable and low-loss correlated plasmons in Mott-like insulating oxides
Matthew Sherburne, T. Venkatesan, Bixing Yan, Teguh Citra Asmara, Christopher T. Nelson, Yongliang Zhao, Tao Zhu, Andrew Minor, Mark Asta, Andrivo Rusydi, Dongyang Wan, Paolo E. Trevisanutto, Ming Yang, Muhammad Aziz Majidi, Mary C. Scott, Yao Cai, Daniel Schmidt, Mallikarjuna R. Motapothula, Mark B. H. Breese, Yuan Ping Feng
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.

Publisher URL: http://www.nature.com/articles/ncomms15271

DOI: 10.1038/ncomms15271

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