We observe fine structure in the resonance spectra of optical microcavities. identify polarization-resolved modes spectrum and find that frequencies split accordance with theoretical prediction. The observed is dominantly caused by an spin-orbit coupling non-paraxial propagation reflection. Both effects are intrinsic, i.e. present ideal rotation-symmetric system, scale inversely proportional to...

Cosmography is a phenomenological and relatively model-independent approach to cosmology, where physical quantities are expanded as Taylor series in the cosmological redshift, or related variables. Here we apply this methodology constrain possible variations of fine-structure constant, α. Two peculiarities case existence high-redshift data, fact that one term directly tightly constraint by loca...