Optical imaging of strain in two-dimensional crystals
| Autor: | Mennel, Lukas, Furchi, Marco M., Wachter, Stefan, Paur, Matthias, Polyushkin, Dmitry K., Mueller, Thomas |
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| Rok vydání: | 2019 |
| Předmět: | |
| Zdroj: | Nature Communications 9, 516 (2018) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1038/s41467-018-02830-y |
| Popis: | 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 to extract 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. Comment: 13 pages, 4 figures |
| Databáze: | arXiv |
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