Monomorphs, bimorphs, and multimorphs from polar polymer electrets

Mono-, bi-, and multimorphs are poled electrets with +/0, +/-, and more com plicated alternating-polarity dipole-orientation patterns, respectively. Be cause of their unusual macroscopic piezo- and pyroelectrical as well as non linear optical properties, such structures are of particular interest for s pecial transducer and optical waveguide applications. In this contribution, the preparation of such dipole-polarization patterns in ferroelectric and amorphous polymer electrets and their nondestructive probing by means of th ermal and acoustical techniques are reviewed.