Generation and detection of electromagnetic field with charged material oscillation

• We proposed a method for measuring surface potential charged material oscillation.
• An electric field using the spatial oscillation of a charged object was generated.
• The generated electric field related to an electrical polarity of the object.
• The surface potential distribution matches the electric field distribution.

We generated an electromagnetic field using the spatial oscillation of a charged material such as a polyimide film. The film was vibrated with acoustic waves at 1 Hz–1 kHz. For charged films, changes in electric field intensity with acoustic wave irradiation were detected using an antenna. The electric field intensity and phase were found to be related to the surface voltage and electrical polarity. The surface potential distribution matches the electric field distribution that was measured by scanning the local excitation. These results indicate that this phenomenon can be used to measure the electrical properties of charged materials.