An analytical model for the mechanical deformation of locally graphitized diamond

TL;DR

This paper introduces an analytical model to predict mechanical deformation in diamond caused by localized graphitization, aiding microfabrication process design and stress analysis.

Contribution

The paper presents a new analytical model that accurately predicts surface deformation and stress fields in locally graphitized diamond, validated by experiments and simulations.

Findings

Model accurately predicts surface deformation.

Validated against profilometry and finite element simulations.

Useful for designing microfabrication processes and assessing stress effects.

Abstract

We propose an analytical model to describe the mechanical deformation of single-crystal diamond following the local sub-superficial graphitization obtained by laser beams or MeV ion microbeam implantation. In this case, a local mass-density variation is generated at specific depths within the irradiated micrometric regions, which in turn leads to swelling effects and the development of corresponding mechanical stresses. Our model describes the constrained expansion of the locally damaged material and correctly predicts the surface deformation, as verified by comparing analytical results with experimental profilometry data and Finite Element simulations. The model can be adopted to easily evaluate the stress and strain fields in locally graphitized diamond in the design of microfabrication processes involving the use of focused ion/laser beams, for example to predict the potential formation of cracks, or to evaluate the influence of stress on the properties of opto mechanical devices.