  We perform electromagnetic wave simulations of fully three-dimensional
optical Lima\c{c}on-microcavities, one basis for their future applications in
microlasers and photonic devices. The analysis of the three-dimensional modes
and far-fields reveals an increase of the quality factors as compared to the
two-dimensional case. The structure of the far-field in the third dimension
shows pronounced maxima in the emission directionality inclined to the
resonator plane which may be exploited for coupling the resonator modes to the
environment. This triggers ideas for technical applications, like the suggested
sensor that can detect small changes in the environment based on changes in the
emission profile.
