Valley-selective directional emission enabled by a plasmonic nanoantenna

Tobias Bucher, Mostafa Abasifard, I. Staude, Emad Najafidehaghani, A. George, A. Turchanin, T. Pertsch, Jingshi Yan, Haitao Chen, K. Z. Kamali, M. Rahmani, D. Neshev
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Abstract

We experimentally investigate the coupling of spontaneous emission from monolayer tungsten diselenide to resonant plasmonic nanoantennas at cryogenic temperatures. The low temperature conditions enable preserved chiral polarization states of the spontaneous emission with a valley-selective handedness. By back-focal plane imaging of the scattered spontaneous emission we demonstrate a valley-selective directional emission pattern.
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由等离子体纳米天线实现的谷选择定向发射
我们实验研究了低温下单层二硒化钨自发发射与共振等离子体纳米天线的耦合。低温条件使自发发射具有谷选择性手性的手性极化态得以保留。通过散射自发发射的后焦平面成像,我们证明了一种谷选择定向发射模式。
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