Micro-reflectance and transmittance spectroscopy: a versatile and powerful tool to characterize 2D materials

Optical spectroscopy techniques such as differential reflectance and transmittance have proven to be very powerful techniques for studying 2D materials. However, a thorough description of the experimental setups needed to carry out these measurements is lacking in the literature. We describe a versa...

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Bibliographic Details
Published in:Journal of physics. D, Applied physics Applied physics, 2017-01, Vol.50 (7), p.74002
Main Authors: Frisenda, Riccardo, Niu, Yue, Gant, Patricia, Molina-Mendoza, Aday J, Schmidt, Robert, Bratschitsch, Rudolf, Liu, Jinxin, Fu, Lei, Dumcenco, Dumitru, Kis, Andras, De Lara, David Perez, Castellanos-Gomez, Andres
Format: Article
Language:English
Subjects:
2D materials
differential reflectance
optical spectroscopy
transition metal dichalcogenides
transmittance
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Summary:Optical spectroscopy techniques such as differential reflectance and transmittance have proven to be very powerful techniques for studying 2D materials. However, a thorough description of the experimental setups needed to carry out these measurements is lacking in the literature. We describe a versatile optical microscope setup for carrying out differential reflectance and transmittance spectroscopy in 2D materials with a lateral resolution of ~1 µm in the visible and near-infrared part of the spectrum. We demonstrate the potential of the presented setup to determine the number of layers of 2D materials and characterize their fundamental optical properties, such as excitonic resonances. We illustrate its performance by studying mechanically exfoliated and chemical vapor-deposited transition metal dichalcogenide samples.
ISSN:0022-3727
1361-6463
DOI:10.1088/1361-6463/aa5256