We demonstrate an optomechanical platform where optical mode conversion mediated by mechanical motion enables the arbitrary tailoring of polarization states of propagating light fields. Optomechanical interactions are realized in a Fabry-Pérot resonator, which naturally supports two polarization-degenerate states while an optical control field induces rotational symmetry breaking. Applying such principles, the entire Poincaré sphere is spanned by just optical control of the driving field, realizing reciprocal and nonreciprocal optomechanically induced birefringence for linearly polarized and circularly polarized control driving. A straightforward extension of this setup also enables all-optical tunable isolation and circulation. Our findings open new avenues to exploit optomechanics for the arbitrary manipulation of light polarization.

Photonic Forces

Duggan, R, del Pino, J, Verhagen, E, & Alù, A. (2019). Optomechanically Induced Birefringence and Optomechanically Induced Faraday Effect. Phys.Rev.Lett., 123(2), 023602: 1–023602: 7. doi:10.1103/PhysRevLett.123.023602