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Thermal optical non-­linearity of nematic mesophase enhanced by gold nanoparticles – an experimental and numerical investigation

Thermal optical non-­linearity of nematic mesophase enhanced by gold nanoparticles – an experimental and numerical investigation
Thermal optical non-­linearity of nematic mesophase enhanced by gold nanoparticles – an experimental and numerical investigation
In this work the mechanisms leading to the enhancement of optical nonlinearity of nematic liquid crystalline material through localized heating by doping the liquid crystals (LCs) with gold nanoparticles (GNPs) is investigated. We present some experimental and theoretical results on the effect of voltage and nanoparticle concentration on the nonlinear response of the GNP-­LC suspensions. The optical nonlinearity of these systems is characterized by diffraction measurements and the second order nonlinear refractive index, n2 is used to compare systems with different configurations and operating conditions. A theoretical model based on heat diffusion that takes into account the intensity and finite size of the incident beam, the nanoparticle concentration dependent absorbance of the GNP doped LC systems and the presence of bounding substrates is developed and validated. We use the model to discuss possibilities of enhancing further the optical nonlinearity.
1463-9076
11503-11512
Kurochkin, Oleksandr
d8927abc-b77e-4294-8389-b183f3e7dc5c
Murugesan, Yogesh K.
9efd86c3-4cb9-4390-93fe-2a8362f2caf2
Bennett, Thomas P.
149b33f3-d18f-4a77-bee1-7575951ac8c6
D'Alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b
Reznikov, Yuri
a21f8fa4-453b-4014-b148-2d5f8f3126ef
Tang, B.J.
b005d57a-311e-406a-a4f3-7fa36c56eb28
Mehl, Georg H.
f851df0d-71e8-476a-b3a4-e51e8d3b4d6b
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327
Kurochkin, Oleksandr
d8927abc-b77e-4294-8389-b183f3e7dc5c
Murugesan, Yogesh K.
9efd86c3-4cb9-4390-93fe-2a8362f2caf2
Bennett, Thomas P.
149b33f3-d18f-4a77-bee1-7575951ac8c6
D'Alessandro, Giampaolo
bad097e1-9506-4b6e-aa56-3e67a526e83b
Reznikov, Yuri
a21f8fa4-453b-4014-b148-2d5f8f3126ef
Tang, B.J.
b005d57a-311e-406a-a4f3-7fa36c56eb28
Mehl, Georg H.
f851df0d-71e8-476a-b3a4-e51e8d3b4d6b
Kaczmarek, Malgosia
408ec59b-8dba-41c1-89d0-af846d1bf327

Kurochkin, Oleksandr, Murugesan, Yogesh K., Bennett, Thomas P., D'Alessandro, Giampaolo, Reznikov, Yuri, Tang, B.J., Mehl, Georg H. and Kaczmarek, Malgosia (2016) Thermal optical non-­linearity of nematic mesophase enhanced by gold nanoparticles – an experimental and numerical investigation. Physical Chemistry Chemical Physics, 2016 (16), 11503-11512. (doi:10.1039/C6CP00116E).

Record type: Article

Abstract

In this work the mechanisms leading to the enhancement of optical nonlinearity of nematic liquid crystalline material through localized heating by doping the liquid crystals (LCs) with gold nanoparticles (GNPs) is investigated. We present some experimental and theoretical results on the effect of voltage and nanoparticle concentration on the nonlinear response of the GNP-­LC suspensions. The optical nonlinearity of these systems is characterized by diffraction measurements and the second order nonlinear refractive index, n2 is used to compare systems with different configurations and operating conditions. A theoretical model based on heat diffusion that takes into account the intensity and finite size of the incident beam, the nanoparticle concentration dependent absorbance of the GNP doped LC systems and the presence of bounding substrates is developed and validated. We use the model to discuss possibilities of enhancing further the optical nonlinearity.

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Accepted/In Press date: 25 February 2016
e-pub ahead of print date: 1 March 2016
Published date: 28 April 2016
Organisations: Quantum, Light & Matter Group, Applied Mathematics

Identifiers

Local EPrints ID: 388825
URI: https://eprints.soton.ac.uk/id/eprint/388825
ISSN: 1463-9076
PURE UUID: eebe0edc-d298-4eb9-bbe4-11cc1e956e9e
ORCID for Giampaolo D'Alessandro: ORCID iD orcid.org/0000-0001-9166-9356

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Date deposited: 04 Mar 2016 10:03
Last modified: 06 Jun 2018 13:05

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