%0 Journal Article %K Perovskite %K Magnetic materials %K Broad frequency range %K Different frequency %K Evanescent fields %K Field distribution %K Image contrasts %K Micro-spectroscopy %K Near-field microscopy %K Scattering and absorption %K Superlenses %K Superlensing %K Electrical engineering %A S.C Kehr %A P Yu %A Y Liu %A M Parzefall %A A.I Khan %A R Jacob %A M.T Wenzel %A H.-G von Ribbeck %A M Helm %A X Zhang %A L.M Eng %A Ramamoorthy Ramesh %B Optical Materials Express %D 2011 %G eng %P 1051-1060 %R 10.1364/OME.1.001051 %T Microspectroscopy on perovskite-based superlenses [Invited] %V 1