Nanoantenna-Enhanced Light鈥揗atter Interaction in Atomically Thin WS2

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• 作者：Johannes Kern ; Andreas Tr眉gler ; Iris Niehues ; Johannes Ewering ; Robert Schmidt ; Robert Schneider ; Sina Najmaei ; Antony George ; Jing Zhang ; Jun Lou ; Ulrich Hohenester ; Steffen Michaelis de Vasconcellos ; Rudolf Bratschitsch
• 刊名：ACS Photonics
• 出版年：2015
• 出版时间：September 16, 2015
• 年：2015
• 卷：2
• 期：9
• 页码：1260-1265
• 全文大小：567K
• ISSN：2330-4022

文摘

Atomically thin transition metal dichalcogenides (TMDCs) are an emerging class of two-dimensional semiconductors. Recently, the first optoelectronic devices featuring photodetection as well as electroluminescence have been demonstrated using monolayer TMDCs as active material. However, the light鈥搈atter coupling for atomically thin TMDCs is limited by their small absorption length and low photoluminescence quantum yield. Here, we significantly increase the light鈥搈atter interaction in monolayer tungsten disulfide (WS₂) by coupling the atomically thin semiconductor to a plasmonic nanoantenna. Due to the plasmon resonance of the nanoantenna, strongly enhanced optical near-fields are generated within the WS₂ monolayer. We observe an increase in photoluminescence intensity by more than 1 order of magnitude, resulting from a combined absorption and emission enhancement of the exciton in the WS₂ monolayer. The polarization characteristics of the coupled system are governed by the nanoantenna. The robust nanoantenna鈥搈onolayer hybrid paves the way for efficient photodetectors, solar cells, and light-emitting devices based on two-dimensional materials.