Abstract Two optical sensing elements based on the surface plasmon waves at the plasmonic-photonic-crystal/air interface, excited in the Kretschmann configuration, are proposed. The sensing elements are designed to detect air humidity and NO2 concentration in air. The angular reflectance spectra of the sensing elements are theoretically analyzed as the function of the analyte concentration. The proposed NO2-sensing element has no cross-sensitivity to humidity. The two sensing elements are based on the same multilayer metal-dielectric structure with the only exception on different gas-sensitive material layers. When combined, the sensing elements can be used to measure humidity and NO2 concentration in humid air.
{"title":"Two optical sensing elements for H2O and NO2 gas sensing based on the single plasmonic – photonic crystal slab","authors":"A. I. Ignatov, A. M. Merzlikin","doi":"10.1515/aot-2019-0059","DOIUrl":"https://doi.org/10.1515/aot-2019-0059","url":null,"abstract":"Abstract Two optical sensing elements based on the surface plasmon waves at the plasmonic-photonic-crystal/air interface, excited in the Kretschmann configuration, are proposed. The sensing elements are designed to detect air humidity and NO2 concentration in air. The angular reflectance spectra of the sensing elements are theoretically analyzed as the function of the analyte concentration. The proposed NO2-sensing element has no cross-sensitivity to humidity. The two sensing elements are based on the same multilayer metal-dielectric structure with the only exception on different gas-sensitive material layers. When combined, the sensing elements can be used to measure humidity and NO2 concentration in humid air.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"203 - 208"},"PeriodicalIF":1.8,"publicationDate":"2020-07-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0059","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44941824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Fahime Ghashghaei, Alireza Rashedi, F. Sarreshtedari, M. Sabooni
Abstract Distribution of the atomic polarization in a Cesium vapor cell, induced by optical pumping, is analytically calculated and discussed when an external magnetic field interacts with the system. Based on the rate equations of the optically pumped atomic system and considering the effect of magnetically induced dichroism on the absorption of polarized propagating light, we have obtained the light intensity and atomic polarization distribution along the propagation direction of the gas cell. It is shown that based on the initial light polarization and the laser detuning, the external magnetic field considerably changes the polarization distribution. The obtained results of the polarization distribution versus applied magnetic field can be used for different investigations, including the study of the atomic magnetometer’s sensitivity.
{"title":"Effect of the magnetically induced dichroism on the distribution of atomic polarization in Cesium vapor cells","authors":"Fahime Ghashghaei, Alireza Rashedi, F. Sarreshtedari, M. Sabooni","doi":"10.1515/aot-2019-0066","DOIUrl":"https://doi.org/10.1515/aot-2019-0066","url":null,"abstract":"Abstract Distribution of the atomic polarization in a Cesium vapor cell, induced by optical pumping, is analytically calculated and discussed when an external magnetic field interacts with the system. Based on the rate equations of the optically pumped atomic system and considering the effect of magnetically induced dichroism on the absorption of polarized propagating light, we have obtained the light intensity and atomic polarization distribution along the propagation direction of the gas cell. It is shown that based on the initial light polarization and the laser detuning, the external magnetic field considerably changes the polarization distribution. The obtained results of the polarization distribution versus applied magnetic field can be used for different investigations, including the study of the atomic magnetometer’s sensitivity.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"209 - 215"},"PeriodicalIF":1.8,"publicationDate":"2020-07-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0066","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47860682","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Driven by greatly increased applications, the optical see-through displays have been developing rapidly in recent decades. As a result, some innovative technologies have emerged toward making the display more compact and lighter with better performance. This paper serves as a systematical review on the advances in developing optical see-through displays, including the physical principles, optical configurations, performance parameters and manufacturing processes. The design principles, current challenges, possible solutions and future potential applications are also discussed in the paper.
{"title":"Advances in the design of optical see-through displays","authors":"Yao Zhou, Jufan Zhang, F. Fang","doi":"10.1515/aot-2020-0005","DOIUrl":"https://doi.org/10.1515/aot-2020-0005","url":null,"abstract":"Abstract Driven by greatly increased applications, the optical see-through displays have been developing rapidly in recent decades. As a result, some innovative technologies have emerged toward making the display more compact and lighter with better performance. This paper serves as a systematical review on the advances in developing optical see-through displays, including the physical principles, optical configurations, performance parameters and manufacturing processes. The design principles, current challenges, possible solutions and future potential applications are also discussed in the paper.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"167 - 186"},"PeriodicalIF":1.8,"publicationDate":"2020-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2020-0005","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41413972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract We performed systematic ab-initio molecular dynamics (MD) simulations of fs-laser-excited silicon (Si) using the Te-dependent density functional theory (DFT). We considered the case in which the potential energy surface (PES) is strongly modified by the laser excitation, so that nonthermal melting occurs. We analyzed the correlation between the time dependence of electronic properties like the band gap and the laser-induced atomic motion. Surprisingly, we found that the indirect electronic band gap decreases as a universal function of the atomic mean-square displacement (MSD) almost independently of the electronic temperature (laser fluence) and that the dependence is linear for a wide range of MSDs. We also found that a universal dependence is also present when analyzing the band gap as a function of the relative Bragg peak intensities, which can be directly measured in experiments.
{"title":"Universal behavior of the band gap as a function of the atomic mean-square displacement in laser-excited silicon","authors":"B. Bauerhenne, Martin E. Garcia","doi":"10.1515/aot-2019-0063","DOIUrl":"https://doi.org/10.1515/aot-2019-0063","url":null,"abstract":"Abstract We performed systematic ab-initio molecular dynamics (MD) simulations of fs-laser-excited silicon (Si) using the Te-dependent density functional theory (DFT). We considered the case in which the potential energy surface (PES) is strongly modified by the laser excitation, so that nonthermal melting occurs. We analyzed the correlation between the time dependence of electronic properties like the band gap and the laser-induced atomic motion. Surprisingly, we found that the indirect electronic band gap decreases as a universal function of the atomic mean-square displacement (MSD) almost independently of the electronic temperature (laser fluence) and that the dependence is linear for a wide range of MSDs. We also found that a universal dependence is also present when analyzing the band gap as a function of the relative Bragg peak intensities, which can be directly measured in experiments.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"145 - 153"},"PeriodicalIF":1.8,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0063","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46281318","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This special issue of Advanced Optical Technologies (AOT) is dedicated to the field of laser-based microand nanostructuring methods. Due to the unique characteristics of pulsed laser systems, among them ultrafast sources with picosecond and femtosecond pulse durations, today we are experiencing an explosion of new technological developments that will open new perspectives for industrial applications in the near future. This becomes possible due to a continuous reduction in the cost of laser sources as well as the outstanding improvement of the power stability, increased pulse repetition frequencies, as well as the simplicity of the new laser devices. However, although these developments are necessary for boosting the availability of lasers in modern industrial manufacturing, they alone will not define the industrialization of laser-based applications. In this context, additional efforts are still necessary for understanding how specific surface functionalities on different materials can be created or even improved by developing specific textured surfaces as well as how to produce these topographies at high throughput by the full utilization of the laser performance. Our list of contributors for this issue reflects a leading-edge mix of experts in these areas, from all around the world. The special issue is published in two parts. Part 2 of the special issue ‘Laser Microand NanoMaterial Processing’ contains four original research articles that are briefly summarized here: Fosodeder et al. demonstrate in in-vitro experiments that a ring of hierarchical micro-nanostructures (selforganized micro-spikes covered with laser-induced periodic surface structures) processed on a titanium alloy cylinder by femtosecond laser irradiation and subsequent anodic oxidation can act as an efficient barrier preventing the overgrowth with fibroblast cells. These results pave way for applications in miniaturized cardiac pacemakers that can be implanted directly into the heart. Ocaña et al. process hierarchical micro-nanostructures (complex two-dimensional periodic multi-gratings) on plane titanium alloy samples by combining the techniques of nanosecond direct laser writing (DLW) with picosecond direct laser interference patterning (DLIP). The processed surfaces feature a strongly hydrophobic surface wettability and may exhibit an improved electrochemical corrosion resistance. Genieys et al. study the ablation of four different metals (Al, Cu, Ni, W) irradiated by single titanium sapphire laser pulses with durations ranging between 15 fs and 100 fs. For these metals, a constant ablation threshold is reported and the energy specific ablation efficiency is quantified on the basis of an analysis of the ablation depths. The authors demonstrate that for metals there is no real interest in using few-optical-cycle pulse durations for ablation-based application processes. Bauerhenne and Garcia analyze the phenomenon of non-thermal melting by performing systematic ab-initio mole
本期《先进光学技术》专刊致力于基于激光的微结构和纳米结构方法领域。由于脉冲激光系统的独特特性，其中包括具有皮秒和飞秒脉冲持续时间的超快光源，今天我们正在经历新技术的爆炸式发展，这将在不久的将来为工业应用开辟新的前景。由于激光源成本的持续降低、功率稳定性的显著提高、脉冲重复频率的增加以及新型激光器件的简单性，这成为可能。然而，尽管这些发展对于提高现代工业制造中激光的可用性是必要的，但仅凭它们并不能定义基于激光的应用的工业化。在这种情况下，仍然需要付出更多的努力来理解如何通过开发特定的纹理表面来创建甚至改善不同材料上的特定表面功能，以及如何通过充分利用激光性能来以高通量生产这些拓扑图。我们的本期撰稿人名单反映了来自世界各地的这些领域的前沿专家。特刊分两期出版。特刊“激光微纳材料加工”的第2部分包含四篇原创研究文章，简要总结如下：Fosodeder等人在体外实验中证明，飞秒激光在钛合金圆柱体上加工了一圈分级微纳米结构（覆盖有激光诱导的周期性表面结构的自组织微尖峰）照射和随后的阳极氧化可以作为防止成纤维细胞过度生长的有效屏障。这些结果为可以直接植入心脏的微型心脏起搏器的应用铺平了道路。Ocaña等人通过将纳秒直接激光写入（DLW）技术与皮秒直接激光干涉图案化（DLIP）技术相结合，在平面钛合金样品上处理分级微纳米结构（复杂的二维周期性多光栅）。经处理的表面具有强疏水性的表面润湿性，并且可以表现出改进的电化学耐腐蚀性。Geneyes等人研究了由持续时间在15fs和100fs之间的单个钛蓝宝石激光脉冲照射的四种不同金属（al、Cu、Ni、W）的烧蚀。对于这些金属，报告了恒定的消融阈值，并且基于对消融深度的分析来量化能量比消融效率。作者证明，对于金属，在基于烧蚀的应用过程中使用很少的光周期脉冲持续时间并没有真正的兴趣。Bauerhenne和Garcia利用电子温度相关密度泛函理论（DFT）对飞秒激光激发的硅进行了系统的从头算分子动力学（MD）模拟，分析了非热熔解现象。模拟表明，间接电子带隙作为原子均方位移的通用函数而减小，几乎与电子温度（激光注量）无关，并且对于宽范围的均方位移，这种相关性是线性的。我们要感谢所有作者对本期特刊的贡献，他们报道了这一引人入胜的主题中的新见解，这些见解大大提高了制造技术的能力。我们还要感谢AOT对本期特刊的协调和指导，以及所有审稿人富有成果的评论，这些评论提高了文章的质量。我们希望你会喜欢阅读本期特刊中的文章，就像我们喜欢把它们放在一起一样*通讯作者：Andrés Fabián Lasagni，德累斯顿工业大学制造技术研究所，德国德累斯顿01062，电子邮件：andres_fabian.lasagni@tu-dresden.de；和Jörn Bonse，Bundesanstalt für Materialforschung und-prüfung（BAM），Unter den Eichen 8712205 Berlin，德国，电子邮件：joern.bonse@bam.de.https://orcid.org/0000-00034984-3896
{"title":"Laser micro- and nano-material processing – Part 2","authors":"A. Lasagni, J. Bonse","doi":"10.1515/aot-2020-0025","DOIUrl":"https://doi.org/10.1515/aot-2020-0025","url":null,"abstract":"This special issue of Advanced Optical Technologies (AOT) is dedicated to the field of laser-based microand nanostructuring methods. Due to the unique characteristics of pulsed laser systems, among them ultrafast sources with picosecond and femtosecond pulse durations, today we are experiencing an explosion of new technological developments that will open new perspectives for industrial applications in the near future. This becomes possible due to a continuous reduction in the cost of laser sources as well as the outstanding improvement of the power stability, increased pulse repetition frequencies, as well as the simplicity of the new laser devices. However, although these developments are necessary for boosting the availability of lasers in modern industrial manufacturing, they alone will not define the industrialization of laser-based applications. In this context, additional efforts are still necessary for understanding how specific surface functionalities on different materials can be created or even improved by developing specific textured surfaces as well as how to produce these topographies at high throughput by the full utilization of the laser performance. Our list of contributors for this issue reflects a leading-edge mix of experts in these areas, from all around the world. The special issue is published in two parts. Part 2 of the special issue ‘Laser Microand NanoMaterial Processing’ contains four original research articles that are briefly summarized here: Fosodeder et al. demonstrate in in-vitro experiments that a ring of hierarchical micro-nanostructures (selforganized micro-spikes covered with laser-induced periodic surface structures) processed on a titanium alloy cylinder by femtosecond laser irradiation and subsequent anodic oxidation can act as an efficient barrier preventing the overgrowth with fibroblast cells. These results pave way for applications in miniaturized cardiac pacemakers that can be implanted directly into the heart. Ocaña et al. process hierarchical micro-nanostructures (complex two-dimensional periodic multi-gratings) on plane titanium alloy samples by combining the techniques of nanosecond direct laser writing (DLW) with picosecond direct laser interference patterning (DLIP). The processed surfaces feature a strongly hydrophobic surface wettability and may exhibit an improved electrochemical corrosion resistance. Genieys et al. study the ablation of four different metals (Al, Cu, Ni, W) irradiated by single titanium sapphire laser pulses with durations ranging between 15 fs and 100 fs. For these metals, a constant ablation threshold is reported and the energy specific ablation efficiency is quantified on the basis of an analysis of the ablation depths. The authors demonstrate that for metals there is no real interest in using few-optical-cycle pulse durations for ablation-based application processes. Bauerhenne and Garcia analyze the phenomenon of non-thermal melting by performing systematic ab-initio mole","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"111 - 112"},"PeriodicalIF":1.8,"publicationDate":"2020-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2020-0025","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47079086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract Here we define a theoretical basis for the generalization of the beam quality factor M2 to three-dimensional (3D) space, which we call M6 formalism. The formalism is established through the use of examples of multifocal and Axicon optical systems to illustrate discrete and continuous axial beam shaping, respectively. For the continuous case, we expand the definition of the Rayleigh range to incorporate a quality factor having both axial and transverse components Madd2$M_{{rm{add}}}^2$ and M2. Using geometrical ray tracing simulations, a proportion factor C is found to empirically describe the axial quality factor Mz2$M_z^2$ of an optical setup including an Axicon and a paraxial focusing lens with a Gaussian single mode input beam. Using our M6 formalism depth of focus (DOF) ranges are calculated for higher M2 beams, and are shown to be in good agreement with the simulated DOF range, demonstrating the usefulness of the M6 formalism for the design of real optical systems.
{"title":"M6 formalism – generalization of the laser beam quality factor M2 to the 3D domain","authors":"A. Brodsky, N. Kaplan","doi":"10.1515/aot-2020-0007","DOIUrl":"https://doi.org/10.1515/aot-2020-0007","url":null,"abstract":"Abstract Here we define a theoretical basis for the generalization of the beam quality factor M2 to three-dimensional (3D) space, which we call M6 formalism. The formalism is established through the use of examples of multifocal and Axicon optical systems to illustrate discrete and continuous axial beam shaping, respectively. For the continuous case, we expand the definition of the Rayleigh range to incorporate a quality factor having both axial and transverse components Madd2$M_{{rm{add}}}^2$ and M2. Using geometrical ray tracing simulations, a proportion factor C is found to empirically describe the axial quality factor Mz2$M_z^2$ of an optical setup including an Axicon and a paraxial focusing lens with a Gaussian single mode input beam. Using our M6 formalism depth of focus (DOF) ranges are calculated for higher M2 beams, and are shown to be in good agreement with the simulated DOF range, demonstrating the usefulness of the M6 formalism for the design of real optical systems.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"167 - 173"},"PeriodicalIF":1.8,"publicationDate":"2020-05-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2020-0007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48742609","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Abstract We provide measurements of the ablation of four post-transition and transition metals [aluminum (Al), copper (Cu), nickel (Ni) and tungsten (W)] irradiated by single 800 nm laser pulses, in ultrashort regime from 100 femtosecond (fs) pulse duration down to 15 fs covering a temporal range little explored as yet. For each metal and pulse duration tested, we measured its ablation characteristics (depth and diameter) as a function of incident energy allowing us to determine its laser-induced ablation threshold and ablation rate in a single-shot regime. For all the metals studied, we observed a constant ablation threshold fluence as a function of pulse duration extending this scaling law to pulse duration of few-optical-cycles. We provide evidence of the interest of adjusting the incident fluence to maximize the energy specific ablation depth but also of the absence of any peculiar advantage related to the use of extremely short-pulse duration for ablation purposes. Those informative and detailed ablation data have been obtained in the single-pulse regime and in air ambiance. They can serve as rewarding feedback for further establishing smart strategy for femtosecond laser micromachining and laser damage handling of metallic and metal-based components as well as for enhancing accuracy of modeling of fs laser interaction with metals in ultrashort regime.
{"title":"Measurement of ultrashort laser ablation of four metals (Al, Cu, Ni, W) in the single-pulse regime","authors":"T. Genieys, M. Sentis, O. Uteza","doi":"10.1515/aot-2019-0064","DOIUrl":"https://doi.org/10.1515/aot-2019-0064","url":null,"abstract":"Abstract We provide measurements of the ablation of four post-transition and transition metals [aluminum (Al), copper (Cu), nickel (Ni) and tungsten (W)] irradiated by single 800 nm laser pulses, in ultrashort regime from 100 femtosecond (fs) pulse duration down to 15 fs covering a temporal range little explored as yet. For each metal and pulse duration tested, we measured its ablation characteristics (depth and diameter) as a function of incident energy allowing us to determine its laser-induced ablation threshold and ablation rate in a single-shot regime. For all the metals studied, we observed a constant ablation threshold fluence as a function of pulse duration extending this scaling law to pulse duration of few-optical-cycles. We provide evidence of the interest of adjusting the incident fluence to maximize the energy specific ablation depth but also of the absence of any peculiar advantage related to the use of extremely short-pulse duration for ablation purposes. Those informative and detailed ablation data have been obtained in the single-pulse regime and in air ambiance. They can serve as rewarding feedback for further establishing smart strategy for femtosecond laser micromachining and laser damage handling of metallic and metal-based components as well as for enhancing accuracy of modeling of fs laser interaction with metals in ultrashort regime.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"131 - 143"},"PeriodicalIF":1.8,"publicationDate":"2020-05-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0064","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47333683","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Peter Fosodeder, W. Baumgartner, C. Steinwender, A. W. Hassel, C. Florian, J. Bonse, J. Heitz
Abstract The invention of new miniaturized and smart medical implants continues in all medical fields, including miniaturized heart pacemakers. These implants often come with a titanium (Ti) casing, which may have to be removed after several months or years and shall therefore not be completely overgrown by cells or scar tissue after implantation. Scar tissue is mainly formed by fibroblast cells and extracellular matrix proteins like collagen produced by them. Suppression of fibroblast growth at Ti surfaces could be achieved by 800 nm femtosecond laser-ablation creating self-organized sharp spikes with dimensions in the 10 μm-range which are superposed by fine sub-μm parallel ripples. On flat Ti control samples, the best results regarding suppression of cell growth were obtained on spike-structures which were additionally electrochemically anodized under acidic conditions. When Ti cylinders with a diameter of 8 mm (similar as the pacemakers) were placed upright in a culture of murine fibroblasts, a multi-layer cell growth up to a height of at least 1.5 mm occurred within 19–22 days. We have demonstrated that a laser-structured and anodized ring around the Ti cylinder surface is an effective way to create a barrier that murine fibroblasts were not able to overgrow within this time.
{"title":"Repellent rings at titanium cylinders against overgrowth by fibroblasts","authors":"Peter Fosodeder, W. Baumgartner, C. Steinwender, A. W. Hassel, C. Florian, J. Bonse, J. Heitz","doi":"10.1515/aot-2019-0070","DOIUrl":"https://doi.org/10.1515/aot-2019-0070","url":null,"abstract":"Abstract The invention of new miniaturized and smart medical implants continues in all medical fields, including miniaturized heart pacemakers. These implants often come with a titanium (Ti) casing, which may have to be removed after several months or years and shall therefore not be completely overgrown by cells or scar tissue after implantation. Scar tissue is mainly formed by fibroblast cells and extracellular matrix proteins like collagen produced by them. Suppression of fibroblast growth at Ti surfaces could be achieved by 800 nm femtosecond laser-ablation creating self-organized sharp spikes with dimensions in the 10 μm-range which are superposed by fine sub-μm parallel ripples. On flat Ti control samples, the best results regarding suppression of cell growth were obtained on spike-structures which were additionally electrochemically anodized under acidic conditions. When Ti cylinders with a diameter of 8 mm (similar as the pacemakers) were placed upright in a culture of murine fibroblasts, a multi-layer cell growth up to a height of at least 1.5 mm occurred within 19–22 days. We have demonstrated that a laser-structured and anodized ring around the Ti cylinder surface is an effective way to create a barrier that murine fibroblasts were not able to overgrow within this time.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"113 - 120"},"PeriodicalIF":1.8,"publicationDate":"2020-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0070","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41526558","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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