Figure 1: Standard and chiral optomechanics.
From: Polarization-dependent optomechanics mediated by chiral microresonators
(a) Standard optomechanics. A CP beam of power P, partially reflected by a conventional mirror with reflectance R, exerts a radiation force Frad=2RP/c and no torque on the mirror, independently on its spin state. (b) Chiral optomechanics. A left-handed CP (σ+) beam of power P, partially reflected with reflectance R+ by a left-handed (L-) chiral mirror, exerts a radiation force 
and a torque 
on the mirror. Instead, the opposite spin component, σ−, is fully transmitted and has no optomechanical interaction with the L-chiral mirror.
