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Hyperspectral imaging of complex dielectric functions in 2D materials

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Title
Hyperspectral imaging of complex dielectric functions in 2D materials
Author(s)
Kim, Un Jeong; Han, Yoojoong; Nugera, Florence A.; Yun, Seok Joon; Kim, Seok In; Lee, Moonsang; Gutiérrez, Humberto R.; Young Hee Lee; Son, Hyungbin
Publication Date
2024-04
Journal
Nano Today, v.55
Publisher
Elsevier BV
Abstract
It remains a challenge to characterize inhomogeneities in two-dimensional (2D) layered materials associated with strain and defects. Spectroscopic ellipsometry and reflectance/transmittance measurement can be used to characterize complex dielectric functions. However, these techniques are not well suited for submicron spectroscopic imaging of inhomogeneities across a macroscale sample. Here, we report hyperspectral phase microscopy (HPM) to image spatially-resolved complex dielectric functions of refractive index and extinction coefficient of transition metal dichalcogenides. This was implemented by measuring wavelength-dependent phase shifts in optical interference, which were then analyzed by a simple Kramers-Kronig-consistent model. We successfully image not only the phase difference but also patterns of modulated carrier density and strain in mono-/bi-layer heterostructured transition metal dichalcogenides. © 2024 Elsevier Ltd
URI
https://pr.ibs.re.kr/handle/8788114/14913
DOI
10.1016/j.nantod.2024.102170
ISSN
1748-0132
Appears in Collections:
Center for Integrated Nanostructure Physics(나노구조물리 연구단) > 1. Journal Papers (저널논문)
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