title: Intra-cavity stimulated emissions of photons in almost pure spin states without imposed nonreciprocity.
abstract: We propose a chiral Fabry-Perot cavity in which only the cavity modes in almost pure spin (circular polarization) states lase in the presence of gain. In absence of imposed nonreciprocal environments and time-reversal symmetry breaking of emitter states to favor the emission of circularly-polarized photons, only the resonance of modes with a specific spin orientation remains in the cavity. We demonstrate a prototype of the cavity using distributed Bragg reflectors and cholesteric liquid crystals. This reciprocal cavity may provide a method to control the angular momentum state of emitters based on stimulated emissions.
authors.affiliation: Research Center for Applied Sciences, Academia Sinica, Nankang, Taipei 11529, Taiwan. swchang@sinica.edu.tw
authors.forename: Shu-Wei
authors.initials: SW
authors.lastname: Chang
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008962:Models, Theoretical; D017785:Photons; D012031:Refractometry / Q000295:instrumentation*; D012542:Scattering, Radiation; D013113:Spin Labels; D020349:Surface Plasmon Resonance / Q000295:instrumentation* / Q000379:methods*
chemical_list: D013113:Spin Labels