Article

# Shape derivatives of boundary integral operators in electromagnetic scattering. Part II : Application to scattering by a homogeneous dielectric obstacle

05/2011;
Source: arXiv

ABSTRACT We develop the shape derivative analysis of solutions to the problem of
scattering of time-harmonic electromagnetic waves by a bounded penetrable
obstacle. Since boundary integral equations are a classical tool to solve
electromagnetic scattering problems, we study the shape differentiability
properties of the standard electromagnetic boundary integral operators. The
latter are typically bounded on the space of tangential vector fields of mixed
regularity \$TH\sp{-1/2}(\Div_{\Gamma},\Gamma)\$. Using Helmholtz decomposition,
we can base their analysis on the study of pseudo-differential integral
operators in standard Sobolev spaces, but we then have to study the G\^ateaux
differentiability of surface differential operators. We prove that the
electromagnetic boundary integral operators are infinitely differentiable
without loss of regularity. We also give a characterization of the first shape
derivative of the solution of the dielectric scattering problem as a solution
of a new electromagnetic scattering problem.

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### Keywords

boundary integral equations

dielectric scattering problem

electromagnetic boundary integral operators

electromagnetic scattering problems

Helmholtz decomposition

new electromagnetic scattering problem

regularity

scattering

shape derivative analysis

standard electromagnetic boundary integral operators

standard Sobolev spaces

surface differential operators

tangential vector fields

time-harmonic electromagnetic waves