Boundary integral solution of potential problems arising in the modelling of electrified oil films

TL;DR

This paper develops an efficient boundary integral method for modeling electrified oil films in optical devices, focusing on interface-only problems to handle thin films and demonstrate super-algebraic convergence.

Contribution

It introduces a boundary integral formulation and Nyström method tailored for thin, periodic oil-air interfaces in electrified films, improving computational efficiency.

Findings

Super-algebraic convergence demonstrated

Efficient handling of thin film interfaces

Numerical experiments validate method performance

Abstract

We consider a class of potential problems on a periodic half-space for the modelling of electrified oil films, which are used in the development of novel switchable liquid optical devices (diffraction gratings). A boundary integral formulation which reduces the problem to the study of the oil-air interface alone is derived and solved in a highly efficient manner using the Nystr\"{o}m method. The oil films encountered experimentally are typically very thin and thus an interface-only integral representation is important for avoiding the near-singularity problems associated with boundary integral methods for long slender domains. The super-algebraic convergence of the proposed methods is discussed and demonstrated via appropriate numerical experiments.