Advanced Optical Technologies最新文献

{"title":"Frontmatter","authors":"","doi":"10.1515/aot-2020-frontmatter4","DOIUrl":"https://doi.org/10.1515/aot-2020-frontmatter4","url":null,"abstract":"","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"30 2","pages":""},"PeriodicalIF":1.8,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2020-frontmatter4","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"41297444","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}

{"title":"Good news!","authors":"A. Thoss","doi":"10.1515/aot-2020-0051","DOIUrl":"https://doi.org/10.1515/aot-2020-0051","url":null,"abstract":"","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"161 - 162"},"PeriodicalIF":1.8,"publicationDate":"2020-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2020-0051","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49421594","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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}

{"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}