self_healing DiffractiveOpticalElements University_of_Regensburg OpticalElement Leakage conductive Dopped AIN PMNPT Tape Grain dielectric_trench PANI CBD nanobar EPFL Deposition ScanningSpreadingResistanceMicroscopy Flake #Materials Cobalt-dopedIronOxide PyroelectricDetector Regensburg FM_SKPM DomainSwitching Topography UTEM SiliconCrystal Piezoresponse Protein contact Granada Current PECurve Sperm