Rupprecht C, Klaas M, Knopf H, Taniguchi T, Watanabe K, Qin Y, Tongay S, Schröder S, Eilenberger F, Höfling S, Schneider C
Opt Express. 2020 Jun 22;28(13):18649-18657. doi: 10.1364/OE.392821.
The large oscillator strength of excitons in transition metal dichalcogenide layers facilitates the formation of exciton-polariton resonances for monolayers and van-der-Waals heterostructures embedded in optical microcavities. Here, we show, that locally changing the number of layers in a WSe/hBN/WSe van-der-Waals heterostructure embedded in a monolithic, high-quality-factor cavity gives rise to a local variation of the coupling strength. This effect yields a polaritonic stair case potential, which we demonstrate at room temperature. Our result paves the way towards engineering local polaritonic potentials at length scales down to atomically sharp interfaces, based on purely modifying its real part contribution via the coherent light-matter coupling strength g.
过渡金属二卤化物层中激子的大振子强度有利于在光学微腔中嵌入的单层和范德华异质结构形成激子-极化激元共振。在此，我们表明，在嵌入单片、高品质因子腔中的WSe/hBN/WSe范德华异质结构中局部改变层数会导致耦合强度的局部变化。这种效应产生了极化激元阶梯势，我们在室温下证明了这一点。我们的结果为基于通过相干光-物质耦合强度g纯粹修改其实部贡献，在低至原子级尖锐界面的长度尺度上设计局部极化激元势铺平了道路。
