We realize a tunable laser based on a liquid crystal optical microcavity doped with the pyrromethene 580 organic dye. The tunable range reaches 40 nm. By transforming the system into the Rashba-Dresselhaus coupling regime, the laser action takes place from the bottoms of two oppositely polarized valleys shifted apart in reciprocal space. Measurements of emissions in real space show the persistent spin-helix lasing, which is a consequence of the spin coherence of the system. The platform that we propose can be used in quantum communication, in which information is encoded through light polarization.
In this work we realize an optical resonator incorporating nematic liquid crystal in which photonic cavity modes are in strong light-matter coupling regime with excitons in a 2D organic-inorganic perovskite layer. Using electric field tunability provided by the liquid crystal we can bring our structure to the regime of Rashba-Dresselhaus spin orbit coupling. By a preparation of the orienting polymer layers within the cavity to break inversion symmetry of the liquid crystal layer we were able to engineer polariton energy band structure exhibiting locally non-zero photonic Berry curvature, which can be tuned by an external electric field.
Tapering technique is one of the most useful in the telecommunications as well as in sensing which offers up to now the best quality fused optical fiber elements such as couplers, splitters and combiners. It allows to fabricate various types of the tapers used as platforms of optical fiber transducers for chemical or biological sensors, as well. In the paper polarization properties of an optical biconical taper with liquid crystal cladding are presented. The optical fiber taper manufactured by mentioned above technique was sandwiched between parallel glass plates with ITO and alignment layers to form a tested optical element. Standard nematic liquid crystals E7 and 6CHBT were applied as claddings of the tapered fiber. Sufficient transmission losses of infrared radiation were observed when orientation layers of glass plates were perpendicular to the tapered fiber. The main contribution of this paper is calculation the polarization properties of the tested samples by the Lu-Chipman decomposition method based on measured Mueller matrices. Analysis of measurements show that the applied voltages have the strongest influence on transmission losses and dichroism. These effects will be carefully investigated towards the voltage sensor and emulators of polarization depended loss.
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