Visible Surface Plasmon Modes in Single Bi2Te3 Nanoplate

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• 作者：Meng Zhao ; Michel Bosman ; Mohammad Danesh ; Minggang Zeng ; Peng Song ; Yudi Darma ; Andrivo Rusydi ; Hsin Lin ; Cheng-Wei Qiu ; Kian Ping Loh
• 刊名：Nano Letters
• 出版年：2015
• 出版时间：December 9, 2015
• 年：2015
• 卷：15
• 期：12
• 页码：8331-8335
• 全文大小：369K
• ISSN：1530-6992

文摘

Searching for new plasmonic building blocks which offer tunability and design flexibility beyond noble metals is crucial for advancing the field of plasmonics. Herein, we report that solution-synthesized hexagonal Bi₂Te₃ nanoplates, in the absence of grating configurations, can exhibit multiple plasmon modes covering the entire visible range, as observed by transmission electron microscopy (TEM)-based electron energy-loss spectroscopy (EELS) and cathodoluminescence (CL) spectroscopy. Moreover, different plasmon modes are observed in the center and edge of the single Bi₂Te₃ nanoplate and a breathing mode is discovered for the first time in a non-noble metal. Theoretical calculations show that the plasmons observed in the visible range are mainly due to strong spin鈥搊rbit coupling induced metallic surface states of Bi₂Te₃. The versatility of shape- and size-engineered Bi₂Te₃ nanocrystals suggests exciting possibilities in plasmonics-enabled technology.