Simulating optical strain measurement and designing a nanoscale rosette

Abstract

The laser-based interferometric strain—slope rosette (ISSR) has been used to measure principal strains and stresses on material surfaces. In this paper, optical theory models and computer programs are developed to simulate the optical diffraction and interference of the ISSR. The simulation results compare with the experimental results. Then the feasibility of extending the ISSR into a nanoscale rosette is studied. The indentation size is selected on a nanometre scale and other parameters in the nanoscale ISSR design are studied. A virtual optical experiment is conducted to use the designed nanoscale ISSR to measure virtual strains. The simulations show that the ISSR can be potentially extended to nanometre-scale measurement of material deformations.