Multiple-frequency distorted-wave Born approach to 2D inverse profiling

Abstract

The present paper deals with the inversion from experimental data provided by Institut Fresnel, France. The distorted-wave Born iterative approach is applied to the reconstruction of two lossless configurations involving dielectric circular cylinders. The dynamic range and the resolution of this scheme are governed by the operating frequency. For a low frequency, the dynamic range is large and the resolution is limited; raising the frequency improves the resolution at the cost of dynamic range. To obtain a high resolution for a large contrast, scattered-field information at multiple frequencies can be used. This is demonstrated for two cases where a direct inversion does not lead to convergence.