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[APPLIED OPTICS] High-speed 2D materials inspection using a microscopic dynamic spectroscopic imaging ellipsometer

We describe a high-speed two-dimensional (2D) materials inspection method by using a microscopic dynamic spectroscopic imaging ellipsometer. This system employs a high-numerical-aperture (NA) objective telecentric lens module. Unlike conventional spectroscopic imaging ellipsometers, which require relatively long acquisition times due to rotating polarization elements, our proposed system uses a monolithic polarizing interferometric module. This allows it to extract a spatio-spectral ellipsometric phase map 1(λ, x ) of 2D materials like graphene. It achieves a spatial resolution of a few microns at a speed of a few tens of milliseconds. In this study, we demonstrate that the proposed microscopic dynamic spectroscopic imaging ellipsometer can provide spectroscopic ellipso- metric phase data 1(λ) with 165 spectral bands in the visible range. It inspects a monolayer graphene flake area of 2.5 mm ∗ 1.65 mm in just 1 min, which is the fastest 2D materials inspection capability ever reported, to our
knowledge.
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AO-High-speed 2D materials inspection using a microscopic dynamic spectroscopic imaging ellipsometer.pdf (5.7 MB)

광기술연구실
Opitcal Metrology Laboratory

54896 전북 전주시 덕진구 백제대로 567 전북대학교 공과대학 기계시스템공학부 공대 4호관 317호 / Tel : 063-270-4632, Fax : 063-270-2388 / Email : dashi.kim@jbnu.ac.kr