A Biaxial Strain Sensor Using a Single MoS₂ Grating.

ABSTRACT: In this paper, we report a new type of MoS₂-based grating sensor for in-plane biaxial strain gauges with a precision limit of?~?1‰. The MoS₂ grating is numerically simulated with different biaxial strains up to 5%. Our first-principles calculations reveal that the strain sensitivity of the MoS₂ reflectance spectrum can be considered an additional strain sensor integrated with the grating structure, enabling the mapping of in-plane biaxial strains. Our experimental studies on a prototype MoS₂-grating sensor further confirm that a strain component perpendicular to the grating period can cause intensity peak shifts in the grating's first-order diffraction patterns. This work opens a new path towards the sensing of in-plane biaxial strain within a single-grating device. Our new approach is applicable for other materials that have predictable reflectance response under biaxial strains and the capacity to form a two-dimensional single-crystal layer.

SUBMITTER: Xiang J 

PROVIDER: S-EPMC7876191 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature