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Characterization of optically thin cells and experimental liquid crystals

Characterization of optically thin cells and experimental liquid crystals
Characterization of optically thin cells and experimental liquid crystals
The current development of new liquid crystal devices often requires the use of thin cells and new experimental materials. Characterizing these devices and materials with optical methods can be challenging if (1) the total phase lag is small (“thin cells”) or (2) the liquid crystal optical and dielectric properties are only partially known. We explore the limitations of these two challenges for efficient characterization and assessment of new, to the best of our knowledge, liquid crystal devices. We show that it is possible to extract a wealth of liquid crystal parameters even for cells with a phase lag of ΔΦ ≈ 𝜋, such as E7 liquid crystal in a 1.5 µm cell, using cross-polarized intensity measurements. The reliability of the optical method is also demonstrated for liquid crystals without precise values of dielectric or refractive index coefficients.
1559-128X
4663-4669
Bankova, Denitsa
34388d3d-0094-4a1d-9297-49ce10fec1d3
Brouckaert, Nicolas
3a5fc4fe-1d30-4102-9edd-c15d134a5c4b
Podoliak, Nina
0908b951-00a7-48a5-bc82-631640910b9c
Beddoes, Ben
35375a11-5785-4874-a0a8-88b50be6cede
White, Eleanor
6da08fb6-6d69-47ea-b423-1f05e6fa98fe
Buchnev, Oleksandr
60cdb0d2-3388-47be-a066-61b3b396f69d
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
D'alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b
Bankova, Denitsa
34388d3d-0094-4a1d-9297-49ce10fec1d3
Brouckaert, Nicolas
3a5fc4fe-1d30-4102-9edd-c15d134a5c4b
Podoliak, Nina
0908b951-00a7-48a5-bc82-631640910b9c
Beddoes, Ben
35375a11-5785-4874-a0a8-88b50be6cede
White, Eleanor
6da08fb6-6d69-47ea-b423-1f05e6fa98fe
Buchnev, Oleksandr
60cdb0d2-3388-47be-a066-61b3b396f69d
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
D'alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b

Bankova, Denitsa, Brouckaert, Nicolas, Podoliak, Nina, Beddoes, Ben, White, Eleanor, Buchnev, Oleksandr, Kaczmarek, Malgosia and D'alessandro, Giampaolo (2022) Characterization of optically thin cells and experimental liquid crystals. Applied Optics, 61 (16), 4663-4669. (doi:10.1364/AO.456659).

Record type: Article

Abstract

The current development of new liquid crystal devices often requires the use of thin cells and new experimental materials. Characterizing these devices and materials with optical methods can be challenging if (1) the total phase lag is small (“thin cells”) or (2) the liquid crystal optical and dielectric properties are only partially known. We explore the limitations of these two challenges for efficient characterization and assessment of new, to the best of our knowledge, liquid crystal devices. We show that it is possible to extract a wealth of liquid crystal parameters even for cells with a phase lag of ΔΦ ≈ 𝜋, such as E7 liquid crystal in a 1.5 µm cell, using cross-polarized intensity measurements. The reliability of the optical method is also demonstrated for liquid crystals without precise values of dielectric or refractive index coefficients.

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Characterisation_of_optically_thin_cells_and_experimental_liquid_crystals - Accepted Manuscript
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e-pub ahead of print date: 23 May 2022

Identifiers

Local EPrints ID: 457623
URI: http://eprints.soton.ac.uk/id/eprint/457623
ISSN: 1559-128X
PURE UUID: d8cd9212-07fc-4681-a17d-cdcfbdc77d19
ORCID for Nina Podoliak: ORCID iD orcid.org/0000-0002-3146-0355
ORCID for Giampaolo D'alessandro: ORCID iD orcid.org/0000-0001-9166-9356

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Date deposited: 14 Jun 2022 16:43
Last modified: 02 Dec 2022 02:43

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Contributors

Author: Denitsa Bankova
Author: Nicolas Brouckaert
Author: Nina Podoliak ORCID iD
Author: Ben Beddoes
Author: Eleanor White
Author: Oleksandr Buchnev

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