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Open AccessArticle

Plasmonic Emission of Bullseye Nanoemitters on Bi2Te3 Nanoflakes

Hebei Key Laboratory of Optic-Electronic Information and Materials, College of Physics Science & Technology, Hebei University, Baoding 071002, China
Authors to whom correspondence should be addressed.
Materials 2020, 13(7), 1531; (registering DOI)
Received: 23 February 2020 / Revised: 17 March 2020 / Accepted: 24 March 2020 / Published: 26 March 2020
Topological insulators, such as Bi2Te3, have been confirmed to exhibit plasmon radiation over the entire visible spectral range. Herein, we fabricate bullseye nanoemitters, consisting of a central disk and concentric gratings, on the Bi2Te3 nanoflake. Due to the existence of edge plasmon modes, Bi2Te3 bullseye nanostructures are possible to converge light towards the central disk. Taking advantage of the excellent spatial resolution of cathodoluminescence (CL) characterization, it has been observed that plasmonic behaviors depend on the excitation location. A stronger plasmonic intensity and a wider CL spectral linewidth can be obtained at the edge of the central disk. In order to further improve the focusing ability, a cylindrical Pt nanostructure has been deposited on the central disk. Additionally, the finite element simulation indicates that the electric-field enhancement originates from the coupling process between the plasmonic emission from the Bi2Te3 bullseye and the Pt nanostructure. Finally, we find that enhancement efficiency depends on the thickness of the Pt nanostructure.
Keywords: Bi2Te3 nanoflakes; bullseye nanostructure; cathodoluminescence; plasmonic resonance Bi2Te3 nanoflakes; bullseye nanostructure; cathodoluminescence; plasmonic resonance
MDPI and ACS Style

Yan, Q.; Li, X.; Liang, B. Plasmonic Emission of Bullseye Nanoemitters on Bi2Te3 Nanoflakes. Materials 2020, 13, 1531.

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