  Dissipative optomechanics has some advantages in cooling compared to the
conventional dispersion dominated systems. Here, we study the optical response
of a cantilever-like, silica, microsphere pendulum, evanescently coupled to a
fiber taper. In a whispering gallery mode resonator the cavity mode and motion
of the pendulum result in both dispersive and dissipative optomechanical
interactions. This unique mechanism leads to an experimentally observable,
asymmetric response function of the transduction spectrum which can be
explained using coupled-mode theory. The optomechanical transduction, and its
relationship to the external coupling gap, are investigated and we show that
the experimental behavior is in good agreement with the theoretical
predictions. A deep understanding of this mechanism is necessary to explore
trapping and cooling in dissipative optomechanical systems.
