ИСТИНА

The integration of chiral metasurfaces or photonic crystal layers into semiconductor light emitting devices with quantum dots (QDs) or quantum wells (QWs) allows the creation of compact sources of circularly polarized light, including lasers [1-5]. For example, the circularly polarized photoluminescence of InAs QDs from a chirally modulated GaAs/AlGaAs waveguide structure with a degree of circular polarization exceeding 95% was demonstrated in [4]. A close to the circularly polarized laser generation was obtained [5] at room temperature and optical pumping from an AlAs/AlGaAs Bragg microcavity with GaAs QWs in the active region and a chirally modulated upper mirror. Such structures can work both in the photonic-crystalline regime and as meta-surfaces, when all the diffraction channels are closed. To control the circular polarization of radiation, such chiral structures do not require the application of a static magnetic field or thick quarter-wave plates. The physical principles of their work are based on the properties of resonance photon states in them and are determined by their geometry and symmetry. In my talk I plan to discuss the physical principles of controlling the polarization of light emission of structures with chiral photonic crystals and metasurfaces. [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).