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Directional radiation and photothermal effect enhanced control of 2D excitonic emission based on germanium nanoparticles
Nanotechnology ( IF 3.5 ) Pub Date : 2020-07-01 , DOI: 10.1088/1361-6528/ab9a71
Jiahao Yan 1 , Peng Yu , Churong Ma , Yingcong Huang , Guowei Yang
Affiliation  

Dielectric nanostructures with Mie resonances have shown promising applications on building nanoantennas and metasurfaces. Coupling between Mie resonators and transition metal dichalcogenide (TMDC) monolayers is of great significance, because the existence of Mie resonances can modulate phases and radiation directions effectively. Recently, monolayer binary and ternary TDMCs have drawn more attention owing to the intriguing and tunable excitonic states from visible to near infrared. However, the coupling mechanism between monolayer TMDCs and Mie resonators has not been well studied. Moreover, it is still a great challenge to realize the control of excitonic emission wavelength and intensity simultaneously. Here, for the first time, we demonstrate that germanium nanoparticles (Ge NPs), a typical high refractive index dielectric Mie resonator, are capable to control both the intensity and direction of PL emission in the near-infrared from monolayer WSe2(1-x)Te2x. Through putting Ge NPs below or above monolayers, we observed the obvious emission directivity because of the higher refractive index and higher loss of Ge than silicon. Besides, higher absorption in Ge NPs brings photothermal effects during the interaction with TMDCs. These findings indicates Ge-based Mie resonators may guide the design of new type nanophotonics devices in the future.

中文翻译:

基于锗纳米粒子的定向辐射和光热效应增强对二维激子发射的控制

具有米氏共振的介电纳米结构在构建纳米天线和超表面方面显示出有前景的应用。Mie 谐振器与过渡金属二硫属化物 (TMDC) 单层之间的耦合具有重要意义,因为 Mie 谐振的存在可以有效地调制相位和辐射方向。最近,单层二元和三元 TDMC 由于从可见光到近红外的有趣且可调谐的激子态而引起了更多关注。然而,单层TMDC与Mie谐振器之间的耦合机制尚未得到很好的研究。此外,同时实现对激子发射波长和强度的控制仍然是一个巨大的挑战。在这里,我们首次证明了锗纳米粒子 (Ge NPs),一种典型的高折射率介电 Mie 谐振器,能够控制单层 WSe2(1-x)Te2x 近红外 PL 发射的强度和方向。通过将 Ge NPs 置于单层之下或之上,我们观察到明显的发射方向性,因为 Ge 比硅具有更高的折射率和更高的损耗。此外,Ge NPs 的较高吸收在与 TMDCs 相互作用期间带来了光热效应。这些发现表明,基于锗的 Mie 谐振器可能会指导未来新型纳米光子学器件的设计。Ge NPs 的更高吸收在与 TMDCs 相互作用期间带来光热效应。这些发现表明,基于 Ge 的 Mie 谐振器可能会指导未来新型纳米光子学器件的设计。Ge NPs 的更高吸收在与 TMDCs 相互作用期间带来光热效应。这些发现表明,基于锗的 Mie 谐振器可能会指导未来新型纳米光子学器件的设计。
更新日期:2020-07-01
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