Optical imaging of strain in two-dimensional crystals

Lukas Mennel, Marco M. Furchi, Stefan Wachter, Matthias Paur, Dmitry K. Polyushkin and Thomas Mueller ()
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Lukas Mennel: Vienna University of Technology
Marco M. Furchi: Vienna University of Technology
Stefan Wachter: Vienna University of Technology
Matthias Paur: Vienna University of Technology
Dmitry K. Polyushkin: Vienna University of Technology
Thomas Mueller: Vienna University of Technology

Nature Communications, 2018, vol. 9, issue 1, 1-6

Abstract: Abstract Strain engineering is widely used in material science to tune the (opto-)electronic properties of materials and enhance the performance of devices. Two-dimensional atomic crystals are a versatile playground to study the influence of strain, as they can sustain very large deformations without breaking. Various optical techniques have been employed to probe strain in two-dimensional materials, including micro-Raman and photoluminescence spectroscopy. Here we demonstrate that optical second harmonic generation constitutes an even more powerful technique, as it allows extraction of the full strain tensor with a spatial resolution below the optical diffraction limit. Our method is based on the strain-induced modification of the nonlinear susceptibility tensor due to a photoelastic effect. Using a two-point bending technique, we determine the photoelastic tensor elements of molybdenum disulfide. Once identified, these parameters allow us to spatially image the two-dimensional strain field in an inhomogeneously strained sample.

Date: 2018
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DOI: 10.1038/s41467-018-02830-y

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