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Issue 11, 2019
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Sb2Te3 topological insulator: surface plasmon resonance and application in refractive index monitoring

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Abstract

Topological insulators as new emerging building blocks in electronics and photonics present promising prospects for exciting surface plasmons and enhancing light–matter interaction. Thus, exploring the visible-range plasmonic response of topological insulators is significant to reveal their optical characteristics and broaden their applications at high frequencies. Herein, we report the experimental demonstration of a visible-range surface plasmon resonance (SPR) effect on an antimony telluride (Sb2Te3) topological insulator film. The results show that the SPR can be excited with a relatively small incident angle in the Kretschmann configuration based on the Sb2Te3 film. Especially, we develop an impactful digital holographic imaging system based on the topological insulator SPR and realize the dynamic monitoring of refractive index variation. Compared with the traditional SPR, the Sb2Te3-based SPR possesses a broader measurement range. Our findings open a new avenue for exploring the optical physics and practical applications of topological insulators, such as environmental and biochemical sensing.

Graphical abstract: Sb2Te3 topological insulator: surface plasmon resonance and application in refractive index monitoring

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Publication details

The article was received on 15 Nov 2018, accepted on 19 Dec 2018 and first published on 20 Dec 2018


Article type: Paper
DOI: 10.1039/C8NR09227C
Citation: Nanoscale, 2019,11, 4759-4766

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    Sb2Te3 topological insulator: surface plasmon resonance and application in refractive index monitoring

    H. Lu, S. Dai, Z. Yue, Y. Fan, H. Cheng, J. Di, D. Mao, E. Li, T. Mei and J. Zhao, Nanoscale, 2019, 11, 4759
    DOI: 10.1039/C8NR09227C

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