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Imaging propagative exciton polaritons in atomically thin WSe_2 waveguides

机译：在原子上薄的WSE_2波导中成像繁殖激子极性官

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摘要

The exciton polariton (EP) is a half-light and half-matter quasiparticle that is promising for exploring both fundamental quantum phenomena as well as photonic applications. Van der Waals materials, such as transition-metal dichalcogenide (TMD), emerge as a promising nanophotonics platform due to its support of long propagative EPs even at room temperature. However, real-space studies have been limited to bulk crystal waveguides with a thickness no less than 60 nm. Here we report the nano-optical imaging of the transverse-electric EPs in WSe2 nanoflakes down to a few atomic layers, which can be turned on and off by tuning the polarization state of the excitation laser. Unlike previously studied transverse-magnetic modes that exist only in bulk TMD waveguides, we found that the transverse-electric EPs could reside in ultrathin WSe2 samples, owing to the alignment of the electric field with the in-plane dipole orientation of two-dimensional excitons. Furthermore, we show that the EP wavelength and propagation length can be largely controlled by varying laser energy and sample thickness. These findings open opportunities to realize near-infrared polaritonic devices and circuits truly at the atomically thin limit.
机译：激子极谱（EP）是一个半光线和半物质Quasiparticle，其具有探索基本量子现象以及光子应用。 van der Wa族材料，如过渡金属二甲基化物（TMD），由于其甚至在室温下的长传播EPS的支持，因此成为一个有前途的纳米光电学平台。然而，实用空间研究仅限于厚度不小于60nm的散装晶体波导。在这里，我们将WSE2纳米薄片中的横向电EPS的纳米光学成像报告到少数原子层，通过调谐激光激光的偏振状态，可以通过调谐激光的偏振状态来打开和关闭。与先前研究仅存在散装TMD波导中的横向磁性模式不同，我们发现横向电气EP可以驻留在超薄WSE2样品中，由于电场与二维激子面内偶极子取向的对准。此外，我们表明，通过改变激光能量和样品厚度，可以大大控制EP波长和传播长度。这些调查结果开放了实现近红外偏光极器件和电路的机会，真正处于原子上薄的极限。

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  • 来源
    《Physical review》 |2019年第12期|121301.1-121301.6|共6页
  • 作者

    Hu F.; Luan Y.; Speltz J.; Zhong D.; Liu C. H.; Yan J.; Mandrus D. G.; Xu X.; Fei Z.;

  • 作者单位

    Iowa State Univ Dept Phys & Astron Ames IA 50011 USA|Iowa State Univ US DOE Ames Lab Ames IA 50011 USA|Univ Colorado Dept Mech Engn Boulder CO 80309 USA;

    Iowa State Univ Dept Phys & Astron Ames IA 50011 USA|Iowa State Univ US DOE Ames Lab Ames IA 50011 USA;

    Iowa State Univ Dept Phys & Astron Ames IA 50011 USA;

    Univ Washington Dept Phys Seattle WA 98195 USA;

    Univ Washington Dept Phys Seattle WA 98195 USA;

    Oak Ridge Natl Lab Mat Sci & Technol Div Oak Ridge TN 37831 USA|Univ Tennessee Dept Mat Sci & Engn Knoxville TN 37996 USA;

    Oak Ridge Natl Lab Mat Sci & Technol Div Oak Ridge TN 37831 USA|Univ Tennessee Dept Mat Sci & Engn Knoxville TN 37996 USA;

    Univ Washington Dept Phys Seattle WA 98195 USA|Univ Washington Dept Mat Sci & Engn Seattle WA 98195 USA;

    Iowa State Univ Dept Phys & Astron Ames IA 50011 USA|Iowa State Univ US DOE Ames Lab Ames IA 50011 USA;

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