Scanning Reflectance Anisotropy Microscopy for Multi-Material Strain Mapping

TL;DR

This paper introduces a broadband scanning reflectance anisotropy microscope capable of high-resolution, hyperspectral strain mapping across multiple materials, enabling non-destructive mechanical characterization of complex multi-material systems.

Contribution

The paper presents a novel phase-sensitive optical platform that maps elastic strain in various materials using reflectance anisotropy, expanding capabilities beyond traditional methods.

Findings

Achieved diffraction-limited sub-micron resolution in strain imaging.

Demonstrated strain sensitivity across metasurfaces, semiconductors, and metals.

Enabled non-destructive mechanical characterization of multi-material components.

Abstract

Strain-engineering of materials encompasses significant elastic deformation and leads to breaking of the lattice symmetry and as a consequence to the emergence of optical anisotropy. However, the capability to image and map local strain fields by optical microscopy is currently limited to specific materials. Here, we introduce a broadband scanning reflectance anisotropy microscope as a phase-sensitive multi-material optical platform for strain mapping. The microscope produces hyperspectral images with diffraction-limited sub-micron resolution of the near-normal incidence ellipsometric response of the sample, which is related to elastic strain by means of the elasto-optic effect. We demonstrate cutting edge strain sensitivity using a variety of materials, such as metasurfaces, semiconductors and metals. The versatility of the method to study the breaking of the lattice symmetry by simple reflectance measurements opens up the possibility to carry out non-destructive mechanical characterization of multi-material components, such as wearable electronics and optical semiconductor devices.