Manipulation of photoluminescence of two-dimensional MoSe2 by gold nanoantennas.
Manipulation of photoluminescence of two-dimensional MoSe2 by gold nanoantennas.
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DOI：
10.1038/srep22296
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发表时间：
2016-02-29
影响因子：
4.6
通讯作者：
Neshev D
中科院分区：
文献类型：
--
作者：
Chen H;Yang J;Rusak E;Straubel J;Guo R;Myint YW;Pei J;Decker M;Staude I;Rockstuhl C;Lu Y;Kivshar YS;Neshev D
单层二硒化钼（MoSe 2）是TMDC家族的成员，是用于耦合到金等离子体纳米结构的有吸引力的候选者，因为与经常研究的二硫化钼（MoS 2）相比，它具有更小的带隙和更高的电子迁移率。MoSe 2的PL发生在近红外光谱范围内，其中发射特性不受由于带间跃迁而在金中增强的耗散的影响。在这里，我们研究了单层MoSe 2和等离子体偶极天线之间的相互作用，与MoSe 2的PL发射共振。通过改变MoSe 2层和纳米天线之间的间隔物的厚度，我们展示了PL强度从近四倍淬灭到约三倍增强的操纵。此外，我们表明，耦合的TMDC纳米天线系统具有很强的偏振相关的PL，从而提供了基于偏振的发射控制的可能性。我们的实验结果也得到了数值模拟的支持。据我们所知，这是第一次研究Au-MoSe 2等离子体混合结构实现灵活的PL操纵。
Monolayer molybdenum diselenide (MoSe2), a member of the TMDCs family, is an appealing candidate for coupling to gold plasmonic nanostructures as it has smaller bandgap and higher electron mobility in comparison to frequently studied molybdenum disulfide (MoS2). The PL of MoSe2 occurs in the near-infrared spectral range where the emissive properties do not suffer from the enhanced dissipation in the gold due to inter-band transitions. Here, we study the interaction between monolayer MoSe2 and plasmonic dipolar antennas in resonance with the PL emission of MoSe2. By varying the thickness of the spacer between the MoSe2 layer and nanoantenna, we demonstrate manipulation of the PL intensity from nearly fourfold quenching to approximately threefold enhancement. Furthermore, we show that the coupled TMDC-nanoantenna system exhibits strong polarization-dependent PL, thus offering the possibility of polarization-based emission control. Our experimental results are supported by numerical simulations as well. To the best of our knowledge, this is the first study of Au-MoSe2 plasmonic hybrid structures realizing flexible PL manipulation.