  Electric LC resonances, occurring in metallic circuits, govern the motion of
free electrons or electric signals. In this paper, optical LC-like resonances
in high-index particles (HIPs) or dielectric LC resonances have been studied,
which involve bounded electrons and optical fields instead. The resonance
effect is dominated by optical analogues of inductance and capacitance, which
can be determined according to the electromagnetic energy bounded near the
particle. The viewpoint of dielectric optical circuit with equivalent
parameters facilitates the understanding of dielectric resonance effect. The
result also provides a method for studying the optical properties of the HIPs.
