  The dynamics of a core-shell structured ionized particle between two parallel
conductor plates, which is biased with a direct current (DC) voltage, have been
investigated. It has been found that an ionized particle oscillates rapidly
between the DC voltage biased parallel conductors, where the frequency of
oscillation depends on the free-charge density carried by the particle, the DC
bias voltage, and the gap across the two conductor plates. As the presented
system involves a spatially oscillating ionized particle, it represents a
natural prototype for the electric dipole radiation source. Since the frequency
of oscillating ionized particle depends on the DC bias voltage across the
parallel conductor plates, the presented device has a broad wavelength
adjustment range for the emitted radiation.
