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Rabi Splitting in a Plasmonic Nanocavity Coupled to a WS2 Monolayer at Room Temperature
ACS Photonics ( IF 6.5 ) Pub Date : 2018-09-14 00:00:00 , DOI: 10.1021/acsphotonics.8b00931 Xiaobo Han 1 , Kai Wang 2 , Xiangyuan Xing 2 , Mengya Wang 2 , Peixiang Lu 1, 2
ACS Photonics ( IF 6.5 ) Pub Date : 2018-09-14 00:00:00 , DOI: 10.1021/acsphotonics.8b00931 Xiaobo Han 1 , Kai Wang 2 , Xiangyuan Xing 2 , Mengya Wang 2 , Peixiang Lu 1, 2
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A large Rabi splitting (∼145 meV) is demonstrated in a plasmonic nanocavity coupled to a WS2 monolayer at room temperature. The nanocavity is composed of a silver nanocube and a silver film with an Al2O3 spacer of a few nanometers, which belongs to a nanoparticle on mirror (NPoM) type. The surface plasmon resonance (SPR) of the nanocavity can be tuned by controlling the thickness of nanogap and the size of silver nanocubes, which allows to successively adjust the SPR to accurately match the exciton energy of WS2 monolayers (2.02 eV). A mode splitting can be clearly observed from the dark-field scattering spectrum of the single hybrid nanocavity, which is ascribed to a strong coupling between the nanocavity mode and the excitonic mode. Furthermore, the anticrossing curves of the hybrid system are obtained by recording the scattering spectra with varied sizes of silver nanocubes, which further validate the interaction regime. It presents a strong coupling platform for two-dimensional monolayers, which is of potential applications of the development of hybrid nanostructure devices.
中文翻译：
在室温下耦合到WS 2单层的等离子纳米腔中的拉比分裂。
在室温下耦合到WS 2单层的等离子体纳米腔中显示出大的Rabi分裂（〜145 meV）。纳米腔由银纳米立方体和具有几纳米的Al 2 O 3间隔物的银膜组成，该银膜属于镜上纳米颗粒（NPoM）类型。可以通过控制纳米间隙的厚度和银纳米立方体的尺寸来调整纳米腔的表面等离子体共振（SPR），从而可以连续调节SPR以精确匹配WS 2的激子能量。单层（2.02 eV）。从单个混合纳米腔的暗场散射光谱可以清楚地观察到模式分裂，这归因于纳米腔模式和激子模式之间的强耦合。此外，通过记录具有各种尺寸的银纳米立方体的散射光谱，获得了杂化系统的反交叉曲线，这进一步验证了相互作用机制。它为二维单层膜提供了一个强大的耦合平台，这在发展混合纳米结构器件方面具有潜在的应用前景。
更新日期：2018-09-14
中文翻译：
在室温下耦合到WS 2单层的等离子纳米腔中的拉比分裂。
在室温下耦合到WS 2单层的等离子体纳米腔中显示出大的Rabi分裂（〜145 meV）。纳米腔由银纳米立方体和具有几纳米的Al 2 O 3间隔物的银膜组成，该银膜属于镜上纳米颗粒（NPoM）类型。可以通过控制纳米间隙的厚度和银纳米立方体的尺寸来调整纳米腔的表面等离子体共振（SPR），从而可以连续调节SPR以精确匹配WS 2的激子能量。单层（2.02 eV）。从单个混合纳米腔的暗场散射光谱可以清楚地观察到模式分裂，这归因于纳米腔模式和激子模式之间的强耦合。此外，通过记录具有各种尺寸的银纳米立方体的散射光谱，获得了杂化系统的反交叉曲线，这进一步验证了相互作用机制。它为二维单层膜提供了一个强大的耦合平台，这在发展混合纳米结构器件方面具有潜在的应用前景。
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