Cathodoluminescence and tip-plasmon resonance of Bi2Te3 triangular nanostructures

Authors

• Qigeng Yan, University of Arkansas, FayettevilleFollow
• Siyuan Wang, Baoding University, China
• Kuiwen Guan, University of Arkansas, Fayetteville
• Xiaojin Guan, University of Arkansas, Fayetteville
• Lei He, University of Arkansas, Fayetteville

Document Type

Article

Publication Date

1-19-2024

Keywords

plasmonic resonance, electron microscopy, nanostructures

Abstract

Bi₂Te₃, as a topological insulator, is able to support plasmonic emission in the visible spectral range. Thin Bi₂Te₃ flakes can be exfoliated directly from a Bi₂Te₃ crystal, and the shape of Bi₂Te₃ flakes can be further modified by focused ion beam milling. Therefore, we have designed a Bi₂Te₃ triangular antenna with distinct tip angles for the application of plasmonic resonance. The plasmonic emission of the Bi₂Te₃ triangular antenna is excited and investigated by cathodoluminescence in the scanning electron microscope. Enhanced tip plasmons have been observed from distinct tips with angles of 20º, 36º, 54º, 70º, and 90º, respectively. Due to the confinement of geometric boundaries for oscillating charges, the resonant peak position of tip plasmon with a smaller angle has a blue shift. Moreover, the dependence of plasmonic behavior on the excitation position has been discovered as well. This research provides a unique approach to fabricate Bi₂Te₃ nanostructures and manipulate the corresponding plasmonic properties.

Citation

Yan Q, Wang S, Guan K, Guan X, He L (2024) Cathodoluminescence and tip-plasmon resonance of Bi2Te3 triangular nanostructures. PLoS ONE 19(1): e0291251. https://doi.org/10.1371/journal.pone.0291251

Creative Commons License

This work is licensed under a Creative Commons Attribution 4.0 International License.