期刊
NANOSCALE
卷 11, 期 11, 页码 4759-4766出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr09227c
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资金
- National Key R&D Program of China [2017YFA0303800]
- National Natural Science Foundation of China [11634010, 61705186, 11774290]
- Natural Science Basic Research Plan in Shaanxi Province of China [2017JQ1023]
- Technology Foundation for Selected Overseas Chinese Scholar of Shaanxi Province [2017007]
- Fundamental Research Funds for the Central Universities [3102018zy039, 3102018zy050]
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.
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