期刊
NANO LETTERS
卷 22, 期 12, 页码 4848-4853出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.2c01221
关键词
core-shell architectures; two-dimensional materials; dielectric functions; optical resonators; Kramers-Kronig analysis
类别
资金
- NSF Division of Material Research (NSF) [DMR-1929356]
- SHyNE Resource [National Science Foundation (NSF)] [ECCS-2025633]
- Northwestern's MRSEC program (NSF) [DMR-1720139]
- Keck Foundation
- State of Illinois through IIN
- Army Research Office [W911NF1910335]
- Office of Naval Research Young Investigator Program (ONR-YIP) Award [N00014-171-2425]
- U.S. Department of Defense (DOD) [W911NF1910335] Funding Source: U.S. Department of Defense (DOD)
In this study, the spatially resolved dielectric functions of Si@MoS2 with nanoscale spatial resolution were extracted using valence electron energy loss spectroscopy (VEELS) and verified through simulations. The contribution of the Si/MoS2 interface was further explored using a cross-sectioned core-shell structure.
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 spectros-copy (VEELS) to extract spatially resolved dielectric functions of Si@MoS2 with nanoscale spatial resolution corroborated with simulations. A hybrid electronic critical point is identified similar to 3.8 eV for Si@MoS2. The dielectric functions at the Si/MoS2 interface 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.
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