  A whispering gallery mode resonator with a cavity-made slot filled atomic
vapor is demonstrated, in which the chiral symmetry is broken induced by
asymmetric backscattering of counter-propagating optical waves in the WGM
microcavity. The chirality of resonator modes is steered via tuning dispersion
relation in the cavity-made slot. The system exhibiting a high displacement
sensitivity 15.22 THz/nm could be applied to optomechanical sensing
applications.
