20.500.12556/RUL-128561 Lensing and waveguiding in birefringent double-twist cylinders demonstrated using FDTD simulations We demonstrate that birefringent profiles of double-twist cylinders, found in some chiral nematic systems such as blue phases, can perform as polarization-selective microlenses and waveguides in the regime of negative birefringence. Specifically, we solve Maxwell’s equations using the finite-difference time-domain (FDTD) method, to simulate light propagation through double-twist cylinder birefringent structures. We show that, in case of negative material birefringence, azimuthally polarized beams experience lensing which can further be extended to waveguiding in double-twist cylinders. Lensing and waveguiding efficiency are shown to be strongly dependent on the ratio between the width of the double-twist cylinder profile and the beam width. We further characterize waveguiding in terms of losses, which are investigated in case of straight as well as curved double-twist cylinders. More generally, this work is a contribution to the design and development of (soft) birefringent profiles for optical and photonic applications. optics photonics birefringence nematic liquid crystals lensing waveguiding optika fotonika dvolomnost nematski tekoči kristali lečenje valovodi true false true Angleški jezik Slovenski jezik V članku navedeno: "© 2018 Optical Society of America under the terms of the OSA Open Access Publishing Agreement"; s povezavo https://www.osapublishing.org/library/license_v1.cfm. (19. 7. 2021) Članek v reviji 2021-07-19 15:58:23 2021-07-19 15:58:23 2023-05-30 03:27:14 0000-00-00 00:00:00 2018 0 0 Str. 26327-26338 no. 20, art. 338171 Vol. 26 2018 0000-00-00 Zaloznikova Objavljeno NiDoloceno 0000-00-00 0000-00-00 0000-00-00 535.5 1094-4087 10.1364/OE.26.026327 3242852 RAZ_Pisljar_Jaka_2018.pdf RAZ_Pisljar_Jaka_2018.pdf 1 E55909EDE5C10958CD330786AB499A27 99820e035338540965908c70516d5d2fac7df1a5ff504c90be8fb1238a1c2d72 a77caf34-e899-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145345 https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-26-20-26327&id=398589 0 7830d34c-e899-11eb-a523-00155dcfd717 https://repozitorij.uni-lj.si/Dokument.php?lang=slv&id=145344 Fakulteta za matematiko in fiziko 0 0 0