报告题目:An iterative solution of electromagnetic inverse scattering problems

报告人：Kamal Belkebir

报告时间：14:00-16:00

报告地点：理学b楼007

 题目：An iterative solution of electromagnetic inverse scattering problems

时间：2018年7月27日，7月29日, 14:00-16:00

地点：理学b楼007

报告人：Kamal Belkebir

Abstract: The realm of inverse scattering problems is to determine properties (position, shape, constitutive materials) of objects from the measurement of their response (scattered field) to an electromagnetic excitation. The application of electromagnetic inverse scattering problems covers optical imaging systems, sub-soil probing, civil engineering etc. These inverse problems are generally ill-posed and nonlinear. However, in the single scattering regime (under the Born approximation), the object is reconstructed thanks to a Fourier transformation of the measurement. When multiple scattering within the object occurs, the relation between the measurement and the object is no longer linear. The most popular strategies for solving the non-linear inverse problem is to reconstruct the permittivity iteratively. One key issue of this approach is the determination of the gradient of the minimized cost functional with respect to the permittivity distribution. This gradient can be derived from Lorentz’s reciprocity theorem. At the presentation, we will describe this derivation as well as the iterative scheme for solving the inverse problem.

Biography: Kamal Belkebir works at inverse scattering problem in electromagnetic domain. He works as associate professor at Fresnel Institute, CNRS, France. He has authored/coauthored lots of papers in peer-reviewed journals, like Nature Photonics, Physical Review Letters, Inverse Problems etc.