ИСТИНА

Chiral photonic crystal and metamaterial slabs and metasurfaces are known to demonstrate a giant optical activity, they can be employed to construct compact sources of circularly polarized light [1-3]. For example, a photoluminescence of InAs quantum dots from a GaAs/AlGaAs waveguiding structure with embedded chiral photonic slab was demonstrated, with a degree of circular polarization exceeding 95% [4]. Recently a close to circularly polarized lasing was reported [5] at room temperature and under optical pump from an AlAs/AlGaAs Bragg microcavity with GaAs quantum wells in the active region and chirally etched upper distributed Bragg refractor. A close to circular lasing of this structure was also demonstrated at low temperature in the exciton-polariton regime [6]. In my talk I will discuss the physical mechanisms allowing to control the polarization state of light emission from photonic structures with chiral photonic crystals and metasurfaces. References [1] K. Konishi, et al., Phys. Rev. Lett. 106, 057402 (2011). [2] A. A. Maksimov, et al., Phys. Rev. B 89, 045316 (2014). [3] S. V. Lobanov, et al., Optics Lett. 40, 1528 (2015). [4] S. V. Lobanov, et al., Phys. Rev. B 92, 205309 (2015). [5] A. A. Demenev, et al., Appl. Phys. Lett. 109, 171106 (2016). [6] V. D. Kulakovskii, et al., to be published.