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Ultrafast laser nanostructuring for photonics and information technology

Ultrafast laser nanostructuring for photonics and information technology
Ultrafast laser nanostructuring for photonics and information technology
The field of ultrafast laser nanostructuring is growing rapidly with the need to search for more advanced fabrication solutions, medium possessing the advantages of both flexibility and tunable optical properties which can be effectively exploited for the integration of polarization sensitive modifications into optical elements and multidimensional optical data storage.

Any material that support nanogratings are of interest for being explored for multidimensional data storage. Therefore, the self-assembled nanostructures by femtosecond laser irradiation are explored in several different materials, such as alkali-free alumina-borosilicate glass, GeO2 glass, and indium-tin-oxide (ITO) thin film. The growth of the induced retardance associated with the nanograting formation in alumina-borosilicate glass is three orders of magnitude slower than in silica glass. The pulse energy for maximum retardance in GeO2 glass is ~65% lower than in fused silica. Direct-write femtosecond laser nanostructuring of ITO thin film is also demonstrated where the deep-subwavelength ripples with periodicity of down to 120 nm are realized originating the form birefringence (|Δn| ≈ 0.2), which is 2 orders of magnitude higher than the commonly observed in uniaxial crystals or femtosecond laser nanostructured fused quartz.

The comparison of a femtosecond laser induced modification in silica matrices with three different degrees of porosity is given. The maximum retardance value achieved in porous glass is twofold higher than in fused silica, and tenfold greater than in aerogel. The polarization sensitive structuring in porous glass by two pulses of ultrafast laser irradiation is demonstrated, as well as no observable stress is generated at any conditions.

Applying the acquired knowledge along with full control of laser system, the polarization sensitive elements are combined into multidimensional data storage providing the main processing conditions required for sufficient practical implementation of the technique. Finally, the proposed improvements in terms of high capacity and high density elevate the technology and potentially push the currently known boundaries to the higher level.
University of Southampton
Cerkauskaite, Ausra
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Cerkauskaite, Ausra
7f5b1e7a-b9f9-41d2-ab4d-307a46605e43
Ibsen, Morten
22e58138-5ce9-4bed-87e1-735c91f8f3b9
Clarkson, William
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Kazansky, Peter
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Gecevicius, Mindaugas
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Beresna, Martynas
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Drevinskas, Rokas
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Patel, Aabid
19aacdf5-c01e-4122-94b6-a29c10485952
Zhang, Jingyu
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Cerkauskaite, Ausra (2018) Ultrafast laser nanostructuring for photonics and information technology. University of Southampton, Doctoral Thesis, 206pp.

Record type: Thesis (Doctoral)

Abstract

The field of ultrafast laser nanostructuring is growing rapidly with the need to search for more advanced fabrication solutions, medium possessing the advantages of both flexibility and tunable optical properties which can be effectively exploited for the integration of polarization sensitive modifications into optical elements and multidimensional optical data storage.

Any material that support nanogratings are of interest for being explored for multidimensional data storage. Therefore, the self-assembled nanostructures by femtosecond laser irradiation are explored in several different materials, such as alkali-free alumina-borosilicate glass, GeO2 glass, and indium-tin-oxide (ITO) thin film. The growth of the induced retardance associated with the nanograting formation in alumina-borosilicate glass is three orders of magnitude slower than in silica glass. The pulse energy for maximum retardance in GeO2 glass is ~65% lower than in fused silica. Direct-write femtosecond laser nanostructuring of ITO thin film is also demonstrated where the deep-subwavelength ripples with periodicity of down to 120 nm are realized originating the form birefringence (|Δn| ≈ 0.2), which is 2 orders of magnitude higher than the commonly observed in uniaxial crystals or femtosecond laser nanostructured fused quartz.

The comparison of a femtosecond laser induced modification in silica matrices with three different degrees of porosity is given. The maximum retardance value achieved in porous glass is twofold higher than in fused silica, and tenfold greater than in aerogel. The polarization sensitive structuring in porous glass by two pulses of ultrafast laser irradiation is demonstrated, as well as no observable stress is generated at any conditions.

Applying the acquired knowledge along with full control of laser system, the polarization sensitive elements are combined into multidimensional data storage providing the main processing conditions required for sufficient practical implementation of the technique. Finally, the proposed improvements in terms of high capacity and high density elevate the technology and potentially push the currently known boundaries to the higher level.

Text
Final Thesis - Version of Record
Restricted to Repository staff only until 30 June 2019.
Available under License University of Southampton Thesis Licence.

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Published date: 2018

Identifiers

Local EPrints ID: 424531
URI: https://eprints.soton.ac.uk/id/eprint/424531
PURE UUID: dcf995f5-542e-4e9e-8ce0-9d3262cb5efe
ORCID for Ausra Cerkauskaite: ORCID iD orcid.org/0000-0002-2476-7797
ORCID for Aabid Patel: ORCID iD orcid.org/0000-0001-9902-5192

Catalogue record

Date deposited: 05 Oct 2018 11:38
Last modified: 14 Mar 2019 01:28

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Contributors

Author: Ausra Cerkauskaite ORCID iD
Thesis advisor: Morten Ibsen
Thesis advisor: William Clarkson
Thesis advisor: Peter Kazansky
Thesis advisor: Mindaugas Gecevicius
Thesis advisor: Martynas Beresna
Thesis advisor: Rokas Drevinskas
Thesis advisor: Aabid Patel ORCID iD
Thesis advisor: Jingyu Zhang

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