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Direct laser interference patterning of diffraction gratings in Safrofilcon-A hydrogel: fabrication and hydration assessment

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dc.contributor.authorDaniel Sola
dc.contributor.authorSola Martínez, Daniel
dc.contributor.authorMilles, Stephan
dc.contributor.authorLasagni, Andrés F.
dc.contributor.departmentFísica
dc.date.accessioned2025-12-16T13:17:58Z
dc.date.available2025-12-16T13:17:58Z
dc.date.copyright© 2021 by the authors
dc.date.issued2021-02-24
dc.description.abstractRefractive index modification by laser micro-structuration of diffractive optical devices in ophthalmic polymers has recently been applied for refractive correction in the fields of optics and ophthalmology. In this work, Safrofilcon-A hydrogel, used as soft contact lenses, was processed by direct laser interference patterning (DLIP) to fabricate linear periodic patterns on the surface of the samples. Periodic modulation of the surface was attained under two-beam interference by using a Q-switched laser source with emission at 263 nm and 4 ns pulse duration. Features of processed areas were studied as a function of both the interference spatial period and the laser fluence. Optical confocal microscopy used to evaluate the topography of the processed samples showed that both structured height and surface roughness increased with laser fluence. Static water contact angle (WCA) measurements were carried out with deionized water droplets on the structured areas to evaluate the hydration properties of DLIP structures. It was observed that the laser structured areas induced a delay in the hydration process. Finally, microstructural changes induced in the structured areas were assessed by confocal micro-Raman spectroscopy showing that at low laser fluences the polymer structure remained almost unaltered. In addition, Raman spectra of hydrated samples recovered the original shape of areas structured at low laser fluence.
dc.formatapplication/pdf
dc.format.extent9
dc.identifier.citationPolymers 2021, 13, 679
dc.identifier.doihttps://doi.org/10.3390/polym13050679
dc.identifier.eissn2073-4360
dc.identifier.urihttp://hdl.handle.net/10201/180569
dc.languageeng
dc.publisherMDPI
dc.relationThis research was funded by European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie IF No 795630. PIT2 program of the University of Murcia’s own research plan and Fundación Séneca grant No 20647/JLI/18 are also acknowledged. The work of A.F. Lasagni is also supported by the German Research Foundation (DFG) under Excellence Initiative program by the German federal and state governments to promote top-level research at German universities.
dc.relation.publisherversionhttps://www.mdpi.com/2073-4360/13/5/679
dc.rightsAttribution 4.0 International*
dc.rights.accessRightsinfo:eu-repo/semantics/openAccess
dc.rights.urihttp://creativecommons.org/licenses/by/4.0/*
dc.subjectDLIP
dc.subjectLaser materials processing
dc.subjectDiffraction gratings
dc.subjectOphthalmic materials
dc.subjectPolymers
dc.subject.odsObjetivo 3: Salud
dc.titleDirect laser interference patterning of diffraction gratings in Safrofilcon-A hydrogel: fabrication and hydration assessment
dc.typeinfo:eu-repo/semantics/article
dc.type.versioninfo:eu-repo/semantics/publishedVersión
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relation.isAuthorOfPublication.latestForDiscoveryce354418-1935-4dab-b53f-a30b5c6e9a53
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