Lensing and waveguiding in birefringent double-twist cylinders demonstrated using FDTD simulations

Pišljar, Jaka (avtor), Ravnik, Miha (avtor)

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.

• Jezik: Angleški jezik
• Ključne besede: optics, photonics, birefringence, nematic liquid crystals, lensing, waveguiding
• Vrsta gradiva: Članek v reviji
• Tipologija: 1.01 - Izvirni znanstveni članek
• Organizacija: FMF - Fakulteta za matematiko in fiziko
• Status publikacije: Objavljeno
• Različica publikacije: Objavljena publikacija
• Leto izida: 2018
• Št. strani: Str. 26327-26338
• Številčenje: Vol. 26, no. 20, art. 338171
• PID: 20.500.12556/RUL-128561
• UDK: 535.5
• ISSN pri članku: 1094-4087
• DOI: 10.1364/OE.26.026327
• COBISS.SI-ID: 3242852

Avtorske pravice

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)

• Datum objave v RUL: 19.07.2021

PIŠLJAR, Jaka in RAVNIK, Miha, 2018, Lensing and waveguiding in birefringent double-twist cylinders demonstrated using FDTD simulations. Optics express [na spletu]. 2018. Vol. 26, no. 20,  338171, p. 26327–26338. [Dostopano 3 april 2025]. DOI 10.1364/OE.26.026327. Pridobljeno s: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=slv&id=128561

Gradivo je del revije

• Naslov: Optics express
• Skrajšan naslov: Opt. express
• Založnik: Optical Society of America
• ISSN: 1094-4087
• COBISS.SI-ID: 8636438

Sekundarni jezik

• Jezik: Slovenski jezik
• Ključne besede: optika, fotonika, dvolomnost, nematski tekoči kristali, lečenje, valovodi