Hybrid exciton-plasmon-polaritons in van der Waals semiconductor gratings
Hybrid exciton-plasmon-polaritons in van der Waals semiconductor gratings
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DOI：
10.1038/s41467-020-17313-2
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发表时间：
2020-07-15
影响因子：
16.6
通讯作者：
Jariwala, Deep
中科院分区：
文献类型：
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作者：
Zhang, Huiqin;Abhiraman, Bhaskar;Jariwala, Deep
货车瓦材料和异质结构，表现出强烈的束缚激子状态在室温下也表现出涌现的物理现象，是光电应用的巨大希望。在这里，我们证明了纳米结构，多层过渡金属二硫属化物（TMDC）本身提供了一个理想的平台，激发和控制激子模式，铺平了道路激子光子学。因此，我们表明，通过图案化的TMDC到纳米谐振器，强色散和避免交叉的激子，腔光子和等离子体激元的有效分离能量超过410毫电子伏，可以控制具有很高的精度。我们进一步观察到，固有的强TMDC激子吸收共振可能会完全抑制由于混合轻物质态的激发和它们的干扰。我们的工作为下一代集成激子光电纳米器件和光产生，计算和传感应用铺平了道路。通过测量不同多层膜厚度、填充因子和光栅周期下的反射光谱，研究了金属衬底和纳米结构过渡金属二硫属化物多层膜形成的异质结构的光学特性。光谱显示出强烈的色散，避免了激子，等离子体激元和腔光子的交叉，沿着与激子模式抑制在反交叉点。
Van der Waals materials and heterostructures that manifest strongly bound exciton states at room temperature also exhibit emergent physical phenomena and are of great promise for optoelectronic applications. Here, we demonstrate that nanostructured, multilayer transition metal dichalcogenides (TMDCs) by themselves provide an ideal platform for excitation and control of excitonic modes, paving the way to exciton-photonics. Hence, we show that by patterning the TMDCs into nanoresonators, strong dispersion and avoided crossing of exciton, cavity photons and plasmon polaritons with effective separation energy exceeding 410meV can be controlled with great precision. We further observe that inherently strong TMDC exciton absorption resonances may be completely suppressed due to excitation of hybrid light-matter states and their interference. Our work paves the way to the next generation of integrated exciton optoelectronic nano-devices and applications in light generation, computing, and sensing. The authors investigate the optical properties of a heterostructure formed by a metallic substrate and a nanostructured transition metal dichalcogenide multilayer by measuring the reflectance spectrum at different multilayer thicknesses, filling factors and grating periods. The spectra show strong dispersion and avoided crossing of excitons, plasmons and cavity photons along with excitonic mode suppression at the anti-crossing point.