Time-reversed image synthesis of dielectric objects

Summary form only given. Typically, the inverse problem has employed frequency domain techniques to reconstruct an object from directly measured scattered fields. Recently, time-domain approaches to the inverse problem have been demonstrated using both electromagnetic and acoustic pulses. More recently, we developed another time-domain imaging technique in which diffracted transients from amplitude-contrast (metallic) objects were used to reconstruct their spatial transmission functions. In a similar vein, we now demonstrate the effectiveness and completeness of this technique using 1D and 2D dielectric objects, for which the image arises from both amplitude and (perhaps even more importantly) phase contrast.