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Lensing and waveguiding in birefringent double-twist cylinders demonstrated using FDTD simulations
ID Pišljar, Jaka (Author), ID Ravnik, Miha (Author)

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Abstract
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.

Language:English
Keywords:optics, photonics, birefringence, nematic liquid crystals, lensing, waveguiding
Work type:Article
Typology:1.01 - Original Scientific Article
Organization:FMF - Faculty of Mathematics and Physics
Publication status:Published
Publication version:Version of Record
Year:2018
Number of pages:Str. 26327-26338
Numbering:Vol. 26, no. 20, art. 338171
PID:20.500.12556/RUL-128561 This link opens in a new window
UDC:535.5
ISSN on article:1094-4087
DOI:10.1364/OE.26.026327 This link opens in a new window
COBISS.SI-ID:3242852 This link opens in a new window
Copyright:
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)
Publication date in RUL:19.07.2021
Views:1019
Downloads:214
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Record is a part of a journal

Title:Optics express
Shortened title:Opt. express
Publisher:Optica
ISSN:1094-4087
COBISS.SI-ID:8636438 This link opens in a new window

Secondary language

Language:Slovenian
Keywords:optika, fotonika, dvolomnost, nematski tekoči kristali, lečenje, valovodi

Projects

Funder:ARRS - Slovenian Research Agency
Project number:P1-0099
Name:Fizika mehkih snovi, površin in nanostruktur

Funder:ARRS - Slovenian Research Agency
Project number:J1-7300
Name:Metamateriali na osnovi tekočekristalnih koloidov

Funder:ARRS - Slovenian Research Agency
Project number:L1-8135
Name:Biološka zdravila: detektor tvorbe proteinskih delcev na osnovi tekočih kristalov

Funder:Other - Other funder or multiple funders
Funding programme:USAF AFRL EOARD
Project number:FA9550-15-1-0418
Name:Nematic Colloidal Tilings as Tunable Soft Metamaterials

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