Laser ablation and high precision patterning of biomaterials and intraocular lenses

Serafetinides, AA; Spyratou, E; Makropoulou, M

dc.contributor.author	Serafetinides, AA	en
dc.contributor.author	Spyratou, E	en
dc.contributor.author	Makropoulou, M	en
dc.date.accessioned	2014-03-01T02:53:20Z
dc.date.available	2014-03-01T02:53:20Z
dc.date.issued	2011	en
dc.identifier.issn	0277786X	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/36243
dc.subject.other	Ablation efficiency	en
dc.subject.other	Ablation mechanisms	en
dc.subject.other	Ablation rates	en
dc.subject.other	Cataract surgeries	en
dc.subject.other	Conventional techniques	en
dc.subject.other	Crater wall	en
dc.subject.other	Etched patterns	en
dc.subject.other	Heat diffusions	en
dc.subject.other	High precision	en
dc.subject.other	Irradiated polymers	en
dc.subject.other	Laser energy fluence	en
dc.subject.other	Mathematical modeling	en
dc.subject.other	Multifocal	en
dc.subject.other	New material	en
dc.subject.other	Organic polymer material	en
dc.subject.other	Polymer materials	en
dc.subject.other	SEM	en
dc.subject.other	Short laser pulse	en
dc.subject.other	Surface modification	en
dc.subject.other	Surface processing	en
dc.subject.other	Thermal damage	en
dc.subject.other	Ultrashort laser pulse	en
dc.subject.other	Atomic force microscopy	en
dc.subject.other	Biological materials	en
dc.subject.other	Contact lenses	en
dc.subject.other	Electron optics	en
dc.subject.other	Intraocular lenses	en
dc.subject.other	Laser ablation	en
dc.subject.other	Laser applications	en
dc.subject.other	Laser pulses	en
dc.subject.other	Optical instruments	en
dc.subject.other	Optical properties	en
dc.subject.other	Organic lasers	en
dc.subject.other	Organic polymers	en
dc.subject.other	Polymers	en
dc.subject.other	Quantum electronics	en
dc.subject.other	Scanning electron microscopy	en
dc.subject.other	Surface testing	en
dc.subject.other	Surfaces	en
dc.subject.other	Pulsed lasers	en
dc.title	Laser ablation and high precision patterning of biomaterials and intraocular lenses	en
heal.type	conferenceItem	en
heal.identifier.primary	10.1117/12.882844	en
heal.identifier.secondary	http://dx.doi.org/10.1117/12.882844	en
heal.identifier.secondary	77470V	en
heal.publicationDate	2011	en
heal.abstract	The use of intraocular lenses (IOL) is the most promising method for restoring excellent vision in cataract surgery. In addition, multifocal intraocular lenses for good distant and near vision are investigated. Several new materials, techniques and patterns are studied for the formation and etching of intraocular lenses in order to improve their optical properties and reduce the diffractive aberrations. As pulsed laser ablation is well established as a universal tool for surface processing of organic polymer materials, this study was focused in using laser ablation with short and ultra short laser pulses for surface modification of PMMA and intraocular lenses, instead of using other conventional techniques. The main advantage of using very short laser pulses, e.g. of ns, ps or fs duration, is that heat diffusion into the polymer material is negligible. As a result high precision patterning of the sample, without thermal damage of the surroundings, becomes possible. In this study, laser ablation was performed using commercially available hydrophobic acrylic IOLs, hydrophilic acrylic IOLs, and PMMA IOLs, with various diopters. We investigated the ablation efficiency and the phenomenology of the etched patterns by testing the ablation rate, versus laser energy fluence, at several wavelengths and the surface modification with atomic force microscopy (AFM), or scanning electron microscopy (SEM). The irradiated polymers have different optical properties, at the applied wavelengths, and therefore, present different ablation behaviour and morphology of the laser ablated crater walls and surrounding surfaces. The experimental results, some theoretical assumptions for mathematical modeling of the relevant ablation mechanisms are discussed. © 2011 SPIE.	en
heal.journalName	Proceedings of SPIE - The International Society for Optical Engineering	en
dc.identifier.doi	10.1117/12.882844	en
dc.identifier.volume	7747	en