Probing the Optical Response and Local Dielectric Function of an Unconventional Si@MoS2 Core-Shell Architecture

Yea Shine Lee, Sina Abedini Dereshgi, Shiqiang Hao, Matthew Cheng, Muhammad Arslan Shehzad, Christopher Wolverton, Koray Aydin, Roberto Dos Reis, Vinayak P. Dravid*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

3 Scopus citations

Abstract

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@MoS2 with 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/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.

Original languageEnglish (US)
Pages (from-to)4848-4853
Number of pages6
JournalNano letters
Volume22
Issue number12
DOIs
StatePublished - Jun 22 2022

Funding

This work was supported by NSF Division of Material Research (NSF Grant DMR-1929356─Program Manager: Lynnette Madsen). This work made use of the EPIC facility of Northwestern University’s NUANCE Center, which has received support from the SHyNE Resource [National Science Foundation (NSF) Grant ECCS-2025633], Northwestern’s MRSEC program (NSF Grant DMR-1720139), the Keck Foundation, and the State of Illinois through IIN. The materials synthesis in this work was partially supported by the Army Research Office (Grant W911NF1910335). K.A. acknowledges support from the Office of Naval Research Young Investigator Program (ONR-YIP) Award (N00014-17-1-2425). The authors wish to thank Dr. Tatsuki Hinamoto, Dr. Hiroshi Sugimoto, and Dr. Minoru Fujii from Kobe University for providing the silicon nanospheres. This work was supported by NSF Division of Material Research (NSF Grant DMR-1929356-Program Manager: Lynnette Madsen). This work made use of the EPIC facility of Northwestern University's NUANCE Center, which has received support from the SHyNE Resource [National Science Foundation (NSF) Grant ECCS-2025633], Northwestern's MRSEC program (NSF Grant DMR-1720139), the Keck Foundation, and the State of Illinois through IIN. The materials synthesis in this work was partially supported by the Army Research Office (Grant W911NF1910335). K.A. acknowledges support from the Office of Naval Research Young Investigator Program (ONR-YIP) Award (N00014-17-1-2425). The authors wish to thank Dr. Tatsuki Hinamoto, Dr. Hiroshi Sugimoto, and Dr. Minoru Fujii from Kobe University for providing the silicon nanospheres.

Keywords

  • Kramers-Kronig analysis
  • core-shell architectures
  • dielectric functions
  • optical resonators
  • two-dimensional materials

ASJC Scopus subject areas

  • Bioengineering
  • General Chemistry
  • General Materials Science
  • Condensed Matter Physics
  • Mechanical Engineering

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