Probing the Optical Response and Local Dielectric Function of an Unconventional Si@MoS 2 Core–Shell Architecture
Probing the Optical Response and Local Dielectric Function of an Unconventional Si@MoS 2 Core–Shell Architecture
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探讨非常规 Si@MoS 2 核壳架构的光学响应和局域介电函数
DOI：
10.1021/acs.nanolett.2c01221
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发表时间：
2022
期刊：
影响因子：
10.8
通讯作者：
Dravid, Vinayak P.
中科院分区：
文献类型：
--
作者：
Lee, Yea-Shine;Abedini Dereshgi, Sina;Hao, Shiqiang;Cheng, Matthew;Shehzad, Muhammad Arslan;Wolverton, Christopher;Aydin, Koray;dos Reis, Roberto;Dravid, Vinayak P.
异质结构的光学腔和量子发射器已强调增强光-物质相互作用。硅纳米球（核）和MoS 2（壳）结构是一种被称为核@壳结构的异质结构。然而，合成的复杂性和固有的困难，以本地探测这种架构，导致缺乏有关其本地化功能的信息，限制了它的进步。在这里，我们利用价电子能量损失谱（VEELS）提取空间分辨的Si@MoS2的介电函数与纳米空间分辨率与模拟证实。Si@MoS2的混合电子临界点被确定为3.8 eV。在Si/MoS 2界面的介电函数进一步探测与横截面的核壳，以评估每个组件的贡献。各种光学参数可以通过介电函数来定义。因此，本文报道的介电函数的方法和演变为探索其他复杂的光子纳米结构提供了一个平台。
Heterostructures of optical cavities and quantum emitters have been highlighted for enhanced light-matter interactions. A silicon nanosphere,core, and MoS2,shell, structure is one such heterostructure referred to as the core@shell architecture. However, the complexity of the synthesis and inherent difficulties to locally probe this architecture have resulted in a lack of information about its localized features limiting its advances. Here, we utilize valence electron energy loss spectroscopy (VEELS) to extract spatially resolved dielectric functions of Si@MoS2with nanoscale spatial resolution corroborated with simulations. A hybrid electronic critical point is identified ∼3.8 eV for Si@MoS2. The dielectric functions at the Si/MoS2interface is further probed with a cross-sectioned core–shell to assess the contribution of each component. Various optical parameters can be defined via the dielectric function. Hence, the methodology and evolution of the dielectric function herein reported provide a platform for exploring other complex photonic nanostructures.