  Whispering gallery mode (WGM) microcavities can efficiently store and
manipulate light with strong light confinement and long photon lifetime, while
coupling light into and from WGMs is intrinsically hindered by their unique
feature of rotational symmetry. Here, a scattering-assisted liquid crystal (LC)
micropillar WGM laser is proposed. WGM lasing at the surface of the micropillar
is obviously enhanced by fluorescence scattering in the core of the
micropillar. Besides, weak scattering of LC molecules also builds efficient
coupling channels between the laser modes and the axial transmission modes of
the micropillar-based waveguide, providing an all-in-one liquid WGM laser with
functions of self-seeding and self-guiding. Furthermore, based on the
hysteresis characteristics of the electrically anchored LC molecules under the
interaction of thermal force, an erasable read-write liquid memory device is
proposed, paving the way for the application of logic-controllable WGM lasers
in optical storage and optical control.
