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首页> 外文期刊>Nature reviews Cancer >Electrically Tunable Exciton-Plasmon Coupling in a WSe2 Monolayer Embedded in a Plasmonic Crystal Cavity
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Electrically Tunable Exciton-Plasmon Coupling in a WSe2 Monolayer Embedded in a Plasmonic Crystal Cavity

机译:在嵌入在等离子体晶体中的WSE2单层中电动调谐激子 - 等离子体耦合

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We realize a new electroplasmonic switch based upon electrically tunable exciton-plasmon interactions. The device consists of a hexagonal boron nitride (hBN)-encapsulated tungsten diselenide (WSe2) monolayer on top of a single-crystalline silver substrate. The ultrasmooth silver substrate serves a dual role as the medium to support surface plasmon polaritons (SPPs) and the bottom gate electrode to tune the WSe2 exciton energy and brightness through electrostatic doping. To enhance the exciton-plasmon coupling, we implement a plasmonic crystal cavity on top of the hBN/WSe2/hBN/Ag heterostructure with a quality factor reaching 550. The tight confinement of the SPPs in the plasmonic cavity enables strong coupling between excitons and SPPs when the WSe2 exciton absorption is resonant with the cavity mode, leading to a vacuum Rabi splitting of up to 18 meV. This strong coupling can also be switched off with the application of a modest gate voltage that increases the doping density in the monolayer. This demonstration paves the way for new plasmonic modulators and a general device architecture to enhance light-matter interactions between SPPs and various embedded emitters.
机译:我们基于电调谐激子 - 等离子体相互作用实现了一种新的电质代轴交换机。该装置包括六边形氮化硼(HBN) - 含有单晶银基质顶部的六边形氮化硼(HBN)淀粉二烯烃(WSE2)单层。超级银基材作为支撑表面等离子体(SPP)和底栅电极的介质是介质的双重作用,通过静电掺杂来调谐WSE2激子能量和亮度。为了增强激子 - 等离子体耦合,我们在HBN / WSE2 / HBN / AG异质结构顶部实施具有质量因数的质子晶体腔,达到550.质子腔中的SPP紧密限制能够在激子和SPP之间进行强烈的耦合当WSE2激子吸收与腔模式共振时,导致真空兔子分裂高达18meV。也可以通过应用适度的栅极电压来关闭这种强耦合,该栅极电压增加了单层中的掺杂密度。该演示为新的等离子体调制器和一般装置架构铺平了道路,以增强SPP和各种嵌入式发射器之间的浅型物质相互作用。

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