Plug ReflexLens kelvin probe force microscopy Worcester_Polytechnic_Institute Magnetostrictive GaAs Chrome DiffractiveOpticalElements StyreneBeads ForceMapping KAIST PolyStylene DataStorage Conductive AFM HACrystal Spincast Optical PvdfBead pulsed_laser_deposition PolymerBlend frequency_modulation dichalcogenide SiliconOxide Current self-assembly DNA HOPG suspended_graphene PolyvinylAcetate Singapore HardDiskMedia CuFoil MESA structure Cell silicon_carbide