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In this work, we propose to extend an approach to calculate at any order$(n)$, the functional derivative of the diffracted field with respect to thepermittivity-contrast function. These derivatives obtained for different ordersare used to perform an expansion of the data according to the studied modelparameter. Its convergence is discussed throughout some numerical results,obtained in the case where the forward model used to simulate the diffractedfield is built in the framework of the volume integral formulation. Inparticular, we show that taking into account higher order derivatives improvedrastically the data-fitting. The numerical application considered consists ofa cylindrical object illuminated by an incident field under a ${\rm TE}$polarisation (electric component parallel to the invariance axis).

High-order functional derivatives of the diffracted field according to the permittivity-contrast function