20.500.12556/RUL-161911 Photonic defect modes in cholesteric liquid crystal resonators with embedded isotropic layers Photonic defect modes are explored as a viable alternative to standard photonic band edge modes in photonic crystal applications, especially due to their typically high Q-factors and local density of states. For example, they can be used in nonlinearity enhancement, lasing, and cavity quantum electrodynamics. However, they are strongly dependent on any structural change and need to be well-controlled to ensure the desired resonance frequency. Here, we present a study of the photonic defect modes that appear in a structure where a layer of isotropic material is embedded between two layers of cholesteric liquid crystal (CLC), using full electrodynamics numerical simulations. We present typical transmission spectra and electric field profiles of selected defect modes and then analyze the influence of geometrical and material parameters on the eigenfrequencies and Q-factors of the modes within and around the photonic bandgap, including refractive indices and thicknesses of isotropic and liquid crystal layers, and different anchoring orientations at the boundaries of the isotropic defect layer. Additionally, a connection of such defect modes to previously extensively analyzed twist defect modes is given. Eigenmodes in asymmetric resonators are also presented, where CLC layers surrounding the intermediate isotropic layer are not equally thick, enabling biasing of specific directional light emission. More generally, this work aims to contribute to the understanding and design capability in topological soft matter photonics where defect mode lasing could be realized in CLC geometries with different singular and solitonic topological defect structures. optics photonics liquid crystals optika fotonika tekoči kristali true false true Angleški jezik Slovenski jezik Članek v reviji 2024-09-16 12:01:34 2024-09-16 12:01:35 2024-09-18 03:42:04 0000-00-00 00:00:00 2024 0 0 Str. 34564-34581 iss. 20 Vol. 32 2024 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 2024-09-10 535 1094-4087 10.1364/OE.535293 207646211 oe-32-20-34564.pdf oe-32-20-34564.pdf 1 B5393D615681805EE37D7249B6057C30 aeb573406a68c8617446b6b4f67a6d050c17156c052760af3df4f52d719d3c8a 0632a2e7-7413-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=190905 https://opg.optica.org/oe/fulltext.cfm?uri=oe-32-20-34564&id=559619 0 1de1708b-7413-11ef-b232-0050569b8976 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=190906 Fakulteta za matematiko in fiziko 0 0 0