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.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Mennel L,Furchi MM,Wachter S,Paur M,Polyushkin DK,Mueller Tdoi
10.1038/s41467-018-02830-ysubject
Has Abstractpub_date
2018-02-06 00:00:00pages
516issue
1issn
2041-1723pii
10.1038/s41467-018-02830-yjournal_volume
9pub_type
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