Interacting polariton fluids in a monolayer of tungsten disulfide
Interacting polariton fluids in a monolayer of tungsten disulfide
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DOI：
10.1038/s41565-018-0219-7
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发表时间：
2018-10-01
影响因子：
38.3
通讯作者：
Kena-Cohen, Stephane
中科院分区：
文献类型：
--
作者：
Barachati, Fabio;Fieramosca, Antonio;Kena-Cohen, Stephane
原子薄的过渡金属二卤化物(TMD)具有许多性质，使它们在实现室温极化器件方面具有吸引力(1)。在单层TMD中操纵极化子流体的理想平台是Bloch表面波，它将电场限制在介质镜(2-4)表面附近的小体积内。在这里，我们证明了单层二硫化钨可以维持布洛赫表面波极化子(BSWP)，其拉比分裂为43 meV，传播长度达到33微米。此外，我们还发现BSWP中有很强的极化-极化激元非线性，这表现为下极化子共振的可逆蓝移。这种非线性是极化电子器件(5-11)的核心，但尚未在TMD极化电子器件中得到证实。作为概念的证明，我们使用非线性来实现一个非线性极化子源。我们的结果表明，使用TMD的BSWP可以支持远距离传输和强非线性，使其在集成光学处理和极化电子电路中具有潜在的应用前景。
Atomically thin transition metal dichalcogenides (TMDs) possess a number of properties that make them attractive for realizing room-temperature polariton devices(1). An ideal platform for manipulating polariton fluids within monolayer TMDs is that of Bloch surface waves, which confine the electric field to a small volume near the surface of a dielectric mirrors(2-4). Here we demonstrate that monolayer tungsten disulfide can sustain Bloch surface wave polaritons (BSWPs) with a Rabi splitting of 43 meV and propagation lengths reaching 33 mu m. In addition, we show strong polariton-polariton nonlinearities within BSWPs, which manifest themselves as a reversible blueshift of the lower polariton resonance. Such nonlinearities are at the heart of polariton devicess(5-11) and have not yet been demonstrated in TMD polaritons. As a proof of concept, we use the nonlinearity to implement a nonlinear polariton source. Our results demonstrate that BSWPs using TMDs can support long-range propagation combined with strong nonlinearities, enabling potential applications in integrated optical processing and polaritonic circuits.