J. Ocaña, D. Huerta-Murillo, A. Lasagni, A. Aguilar‐Morales, S. Alamri, J. Cardoso, Á. García-Beltrán, F. Cordovilla, I. Ángulo
Abstract The use of pulsed laser irradiation techniques has proven to be a clearly effective procedure for the achievement of surface properties modification via micro-/nano-structuration, different conceptual approaches having been the subject of research and extensively reported in the literature. Completing the broad spectrum of applications developed mostly involving the generation of structured surfaces (particularly of metallic materials) with specific contact, friction and wear functionalities, the application of laser sources to the surface structuration of metal surfaces for the modification of their wetability and corrosion resistance properties is considered. The particular problems found for the generation of the appropriate surface microstructure able to replicate the hydrophobic behaviour of some live structures present in nature, their long term stability and their amenability to macroscopic scale are discussed along with innovative methods to generate the required hierarchical micro-/nano-structures by a combination of the DLW and DLIP techniques.
{"title":"Modification of Ti6Al4V surface properties by combined DLW-DLIP hierarchical micro-nano structuring","authors":"J. Ocaña, D. Huerta-Murillo, A. Lasagni, A. Aguilar‐Morales, S. Alamri, J. Cardoso, Á. García-Beltrán, F. Cordovilla, I. Ángulo","doi":"10.1515/aot-2019-0071","DOIUrl":"https://doi.org/10.1515/aot-2019-0071","url":null,"abstract":"Abstract The use of pulsed laser irradiation techniques has proven to be a clearly effective procedure for the achievement of surface properties modification via micro-/nano-structuration, different conceptual approaches having been the subject of research and extensively reported in the literature. Completing the broad spectrum of applications developed mostly involving the generation of structured surfaces (particularly of metallic materials) with specific contact, friction and wear functionalities, the application of laser sources to the surface structuration of metal surfaces for the modification of their wetability and corrosion resistance properties is considered. The particular problems found for the generation of the appropriate surface microstructure able to replicate the hydrophobic behaviour of some live structures present in nature, their long term stability and their amenability to macroscopic scale are discussed along with innovative methods to generate the required hierarchical micro-/nano-structures by a combination of the DLW and DLIP techniques.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"121 - 130"},"PeriodicalIF":1.8,"publicationDate":"2020-04-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0071","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47766727","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 Heterojunction solar cells based on ternary blends of two donors (absorbers and one acceptor) were investigated using modeling. The Tauc-Lorentz model and experimental absorption spectra of selected compounds were used in the simulations. The optimization process was carried out in this way to maximize the absorption of the system. Poly(3-hexylthiophene-2,5-diyl) (PEHT) was investigated as a first donor, which was mixed respectively with poly(3-octylthiophene-2,5-diyl) (P3OT), coumarin 153, purpurin, fluorescent brightener 184, N-chloroethylene carbazole, and 1,3,6,8 tetrachloro 9n amylocarbazole. Simulations were also performed for the Tauc-Lorentz model.
{"title":"Materials for D-D-A ternary organic solar cells: an absorption model study","authors":"G. Lewińska","doi":"10.1515/aot-2019-0055","DOIUrl":"https://doi.org/10.1515/aot-2019-0055","url":null,"abstract":"Abstract Heterojunction solar cells based on ternary blends of two donors (absorbers and one acceptor) were investigated using modeling. The Tauc-Lorentz model and experimental absorption spectra of selected compounds were used in the simulations. The optimization process was carried out in this way to maximize the absorption of the system. Poly(3-hexylthiophene-2,5-diyl) (PEHT) was investigated as a first donor, which was mixed respectively with poly(3-octylthiophene-2,5-diyl) (P3OT), coumarin 153, purpurin, fluorescent brightener 184, N-chloroethylene carbazole, and 1,3,6,8 tetrachloro 9n amylocarbazole. Simulations were also performed for the Tauc-Lorentz model.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"155 - 160"},"PeriodicalIF":1.8,"publicationDate":"2020-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0055","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45081611","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}
Suchandra Banerjee, R. Chipman, N. Hagen, Y. Otani
Abstract The presence of native oxide layers on aluminum mirrors can be a nuisance for precision optical design. As the native oxide thickness varies from mirror to mirror, its effect cannot be completely canceled even in the conventional crossed fold mirror geometry. We show how this effect arises and how it can be mitigated, and provide an experimental demonstration in which the residual linear retardance and linear diattenuation are reduced to <0.14° and <0.001, respectively, over the visible and near-infra-red spectral range.
{"title":"Native oxide layer effect on polarization cancellation for mirrors over the visible to near-infrared region","authors":"Suchandra Banerjee, R. Chipman, N. Hagen, Y. Otani","doi":"10.1515/aot-2020-0004","DOIUrl":"https://doi.org/10.1515/aot-2020-0004","url":null,"abstract":"Abstract The presence of native oxide layers on aluminum mirrors can be a nuisance for precision optical design. As the native oxide thickness varies from mirror to mirror, its effect cannot be completely canceled even in the conventional crossed fold mirror geometry. We show how this effect arises and how it can be mitigated, and provide an experimental demonstration in which the residual linear retardance and linear diattenuation are reduced to <0.14° and <0.001, respectively, over the visible and near-infra-red spectral range.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"175 - 181"},"PeriodicalIF":1.8,"publicationDate":"2020-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2020-0004","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47278192","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}
THE RENAISSANCE SOCIETY OF AMERICA held its annual conference, celebrating the 25th anniversary of the Centre for Reformation and Renaissance Studies (CRRS), in Toronto, from Thursday, April 5 to Saturday, April 7, 1990. The conference was hosted by Victoria College in the University of Toronto. The 36th annual RSA Council business meeting was held on the afternoon of April 5 th in conjunction with the conference. J. Kelly Sowards (Wichita State U) chaired the Thursday afternoon plenary session on Recent Trends in Renaissance Studies: Education in the Renaissance and Reformation. Paul Grendler (U of Toronto) spoke on "Schooling in Italy and Beyond"; Susan Karant-Nunn (Portland State U) on "Early Modern German Schooling and the 'New History' of Education"; and Charles Nauert (U of Missouri, Columbia) on "Humanist Infiltration into the Academic World: Some Studies of Northern Universities." Robert Proctor (Connecticut College) was Commentator and spoke on "The Studia Humanitatis: Contemporary Scholarship and Renaissance Ideals." Anthony Grafton (Princeton U) chaired the Thursday evening plenary session, a CRRS 25th Anniversary Panel, on the topic Early Modern Studies: an Agenda for the New Millennium. Germaine Warkentin (Victoria College, U of Toronto) made introductory remarks and introduced a panel consisting of David Wootton (U of Victoria, BC), Jane Abray (U of Toronto), and Debra Shuger (UCLA) who spoke on "Decanting Theory, or Old Wine in New Bottles." Twenty-nine sessions were held with the following topics and papers presented. On Friday, April 6th, Session 1, Sexuality, Satire and Stage Censorship in the English Renaissance, 1599-1604, was organized and chaired by Richard Burt (U of Massachusetts, Amherst). Lynda Boose (Dartmouth College) presented a paper on "The 1599 Bishops Ban, Elizabethan Pornography and the Sexualization of the Jacobean Stage"; Richard Burt on "Critics as Consumers: Sexual Slander and Censorship in Jonson's Epicene"; and M. Lindsay Kaplan (UC-Berkeley) on "Satire and the Arraignment of Love Poetry in Jonson's Poetaster." Session 2, Renaissance Women from Twentieth-Century Feminist Perspectives: a Modern Walk with Renaissance Notions of Love and Death, was organized by Robert L. Mazzola (U of Connecticut,
{"title":"Conference Notes","authors":"A. Thoss","doi":"10.2307/2862589","DOIUrl":"https://doi.org/10.2307/2862589","url":null,"abstract":"THE RENAISSANCE SOCIETY OF AMERICA held its annual conference, celebrating the 25th anniversary of the Centre for Reformation and Renaissance Studies (CRRS), in Toronto, from Thursday, April 5 to Saturday, April 7, 1990. The conference was hosted by Victoria College in the University of Toronto. The 36th annual RSA Council business meeting was held on the afternoon of April 5 th in conjunction with the conference. J. Kelly Sowards (Wichita State U) chaired the Thursday afternoon plenary session on Recent Trends in Renaissance Studies: Education in the Renaissance and Reformation. Paul Grendler (U of Toronto) spoke on \"Schooling in Italy and Beyond\"; Susan Karant-Nunn (Portland State U) on \"Early Modern German Schooling and the 'New History' of Education\"; and Charles Nauert (U of Missouri, Columbia) on \"Humanist Infiltration into the Academic World: Some Studies of Northern Universities.\" Robert Proctor (Connecticut College) was Commentator and spoke on \"The Studia Humanitatis: Contemporary Scholarship and Renaissance Ideals.\" Anthony Grafton (Princeton U) chaired the Thursday evening plenary session, a CRRS 25th Anniversary Panel, on the topic Early Modern Studies: an Agenda for the New Millennium. Germaine Warkentin (Victoria College, U of Toronto) made introductory remarks and introduced a panel consisting of David Wootton (U of Victoria, BC), Jane Abray (U of Toronto), and Debra Shuger (UCLA) who spoke on \"Decanting Theory, or Old Wine in New Bottles.\" Twenty-nine sessions were held with the following topics and papers presented. On Friday, April 6th, Session 1, Sexuality, Satire and Stage Censorship in the English Renaissance, 1599-1604, was organized and chaired by Richard Burt (U of Massachusetts, Amherst). Lynda Boose (Dartmouth College) presented a paper on \"The 1599 Bishops Ban, Elizabethan Pornography and the Sexualization of the Jacobean Stage\"; Richard Burt on \"Critics as Consumers: Sexual Slander and Censorship in Jonson's Epicene\"; and M. Lindsay Kaplan (UC-Berkeley) on \"Satire and the Arraignment of Love Poetry in Jonson's Poetaster.\" Session 2, Renaissance Women from Twentieth-Century Feminist Perspectives: a Modern Walk with Renaissance Notions of Love and Death, was organized by Robert L. Mazzola (U of Connecticut,","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"1 - 6"},"PeriodicalIF":1.8,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2307/2862589","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46924998","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 Direct femtosecond (fs) laser surface structuring became a versatile way to generate surface structures on solid targets demonstrating a high degree of flexibility and controllability in creating different types of structures for many applications. This approach demonstrated an alteration in various properties of the surface, such as optical properties, wetting response, etc. This paper focuses on direct fs laser surface structuring using complex light beams with spatially variant distribution of the polarization and fluence, with emphasis on the results obtained by the authors by exploiting q-plate beam converters. Although striking scientific findings were achieved so far, direct fs laser processing with complex light fields is still a novel research field, and new exciting findings are likely to appear on its horizon.
{"title":"Direct femtosecond laser surface structuring with complex light beams generated by q-plates","authors":"J. Nivas, E. Allahyari, S. Amoruso","doi":"10.1515/aot-2019-0067","DOIUrl":"https://doi.org/10.1515/aot-2019-0067","url":null,"abstract":"Abstract Direct femtosecond (fs) laser surface structuring became a versatile way to generate surface structures on solid targets demonstrating a high degree of flexibility and controllability in creating different types of structures for many applications. This approach demonstrated an alteration in various properties of the surface, such as optical properties, wetting response, etc. This paper focuses on direct fs laser surface structuring using complex light beams with spatially variant distribution of the polarization and fluence, with emphasis on the results obtained by the authors by exploiting q-plate beam converters. Although striking scientific findings were achieved so far, direct fs laser processing with complex light fields is still a novel research field, and new exciting findings are likely to appear on its horizon.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"53 - 66"},"PeriodicalIF":1.8,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0067","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47897042","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 article represents the Editorial for Part 1 of the Special Issue “Laser Micro- and Nano-Material Processing”.
本文代表特刊“激光微纳材料加工”第一部分的社论。
{"title":"Laser micro- and nano-material processing – Part 1","authors":"J. Bonse, A. Lasagni","doi":"10.1515/aot-2020-0009","DOIUrl":"https://doi.org/10.1515/aot-2020-0009","url":null,"abstract":"This article represents the Editorial for Part 1 of the Special Issue “Laser Micro- and Nano-Material Processing”.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"7 - 9"},"PeriodicalIF":1.8,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2020-0009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44060213","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 The use of ultra-short pulsed lasers enables the fabrication of laser-induced periodic surface structures (LIPSS) on various materials following a single-step, direct-writing technique. These specific, well-ordered nanostructures with periodicities in the order of the utilised laser wavelength facilitate the engineering of surfaces with functional properties. This review paper discusses the physical background of LIPSS formation on substrates with different material properties. Using the examples of structural colours, specific wetting states and the reduction of friction and wear, this work presents experimental approaches that allow to deliberately influence the LIPSS formation process and thus tailor the surface properties. Finally, the review concludes with some future developments and perspectives related to forthcoming applications of LIPSS-based surfaces are discussed.
{"title":"Formation of laser-induced periodic surface structures on different materials: fundamentals, properties and applications","authors":"S. Gräf","doi":"10.1515/aot-2019-0062","DOIUrl":"https://doi.org/10.1515/aot-2019-0062","url":null,"abstract":"Abstract The use of ultra-short pulsed lasers enables the fabrication of laser-induced periodic surface structures (LIPSS) on various materials following a single-step, direct-writing technique. These specific, well-ordered nanostructures with periodicities in the order of the utilised laser wavelength facilitate the engineering of surfaces with functional properties. This review paper discusses the physical background of LIPSS formation on substrates with different material properties. Using the examples of structural colours, specific wetting states and the reduction of friction and wear, this work presents experimental approaches that allow to deliberately influence the LIPSS formation process and thus tailor the surface properties. Finally, the review concludes with some future developments and perspectives related to forthcoming applications of LIPSS-based surfaces are discussed.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"11 - 39"},"PeriodicalIF":1.8,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0062","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42500068","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}
Daniel Holder, Artur Leis, M. Buser, R. Weber, T. Graf
Abstract Additively manufactured parts typically deviate to some extent from the targeted net shape and exhibit high surface roughness due to the size of the powder grains that determines the minimum thickness of the individual slices and due to partially molten powder grains adhering on the surface. Optical coherence tomography (OCT)-based measurements and closed-loop controlled ablation with ultrashort laser pulses were utilized for the precise positioning of the LPBF-generated aluminum parts and for post-processing by selective laser ablation of the excessive material. As a result, high-quality net shape geometries were achieved with surface roughness, and deviation from the targeted net shape geometry reduced by 67% and 63%, respectively.
{"title":"High-quality net shape geometries from additively manufactured parts using closed-loop controlled ablation with ultrashort laser pulses","authors":"Daniel Holder, Artur Leis, M. Buser, R. Weber, T. Graf","doi":"10.1515/aot-2019-0065","DOIUrl":"https://doi.org/10.1515/aot-2019-0065","url":null,"abstract":"Abstract Additively manufactured parts typically deviate to some extent from the targeted net shape and exhibit high surface roughness due to the size of the powder grains that determines the minimum thickness of the individual slices and due to partially molten powder grains adhering on the surface. Optical coherence tomography (OCT)-based measurements and closed-loop controlled ablation with ultrashort laser pulses were utilized for the precise positioning of the LPBF-generated aluminum parts and for post-processing by selective laser ablation of the excessive material. As a result, high-quality net shape geometries were achieved with surface roughness, and deviation from the targeted net shape geometry reduced by 67% and 63%, respectively.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"101 - 110"},"PeriodicalIF":1.8,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0065","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43081157","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}
J. Klein-Wiele, A. Blumenstein, P. Simon, J. Ihlemann
Abstract The fabrication of periodic surface patterns on various materials by ultrashort ultraviolet (UV) laser pulses is reviewed. Laser interference ablation using two or more coherent beams leads to deterministic, strictly periodic patterns. The generation of the interfering beams is accomplished by diffractive optical elements like gratings, grating systems or computer-generated holograms. The recombination of the diffracted beams is performed by optical imaging or diffractive beam management. Ultrashort UV pulses are especially suited for generating micron- to submicron-sized deterministic periodic patterns on metals and semiconductors.
{"title":"Laser interference ablation by ultrashort UV laser pulses via diffractive beam management","authors":"J. Klein-Wiele, A. Blumenstein, P. Simon, J. Ihlemann","doi":"10.1515/aot-2019-0068","DOIUrl":"https://doi.org/10.1515/aot-2019-0068","url":null,"abstract":"Abstract The fabrication of periodic surface patterns on various materials by ultrashort ultraviolet (UV) laser pulses is reviewed. Laser interference ablation using two or more coherent beams leads to deterministic, strictly periodic patterns. The generation of the interfering beams is accomplished by diffractive optical elements like gratings, grating systems or computer-generated holograms. The recombination of the diffracted beams is performed by optical imaging or diffractive beam management. Ultrashort UV pulses are especially suited for generating micron- to submicron-sized deterministic periodic patterns on metals and semiconductors.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"41 - 52"},"PeriodicalIF":1.8,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0068","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46834150","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 Evaporation concentration of target analytes dissolved in a water droplet based on superhydrophobic surfaces could be able to break the limits for sensitive trace substance detection techniques (e.g. SERS) and it is promising in the fields such as food safety, eco-pollution, and bioscience. In the present study, polytetrafluoroethylene (PTFE) surfaces were processed by femtosecond laser and the corresponding processing parameter combinations were optimised to obtain surfaces with excellent superhydrophobicity. The optimal parameter combination is: laser power: 6.4 W; scanning spacing: 40 μm; scanning number: 1; and scanning path: 90 degree. For trapping and localising droplets, a tiny square area in the middle of the surface remained unprocessed for each sample. The evaporation and concentration processes of droplets on the optimised surfaces were performed and analyzed, respectively. It is shown that the droplets with targeted solute can successfully collect all solute into the designed trapping areas during evaporation process on our laser fabricated superhydrophobic surface, resulting in detection domains with high solute concentration for SERS characterisation. It is shown that the detected peak intensity of rhodamine 6G with a concentration of 10−6 m in SERS characterisation can be obviously enhanced by one or two orders of magnitude on the laser fabricated surfaces compared with that of the unprocessed blank samples.
{"title":"Ultrafast laser micro-nano structured superhydrophobic teflon surfaces for enhanced SERS detection via evaporation concentration","authors":"Xinyu Hu, Rui Pan, Mingyong Cai, Weijian Liu, Xiao Luo, Changhao Chen, Guochen Jiang, M. Zhong","doi":"10.1515/aot-2019-0072","DOIUrl":"https://doi.org/10.1515/aot-2019-0072","url":null,"abstract":"Abstract Evaporation concentration of target analytes dissolved in a water droplet based on superhydrophobic surfaces could be able to break the limits for sensitive trace substance detection techniques (e.g. SERS) and it is promising in the fields such as food safety, eco-pollution, and bioscience. In the present study, polytetrafluoroethylene (PTFE) surfaces were processed by femtosecond laser and the corresponding processing parameter combinations were optimised to obtain surfaces with excellent superhydrophobicity. The optimal parameter combination is: laser power: 6.4 W; scanning spacing: 40 μm; scanning number: 1; and scanning path: 90 degree. For trapping and localising droplets, a tiny square area in the middle of the surface remained unprocessed for each sample. The evaporation and concentration processes of droplets on the optimised surfaces were performed and analyzed, respectively. It is shown that the droplets with targeted solute can successfully collect all solute into the designed trapping areas during evaporation process on our laser fabricated superhydrophobic surface, resulting in detection domains with high solute concentration for SERS characterisation. It is shown that the detected peak intensity of rhodamine 6G with a concentration of 10−6 m in SERS characterisation can be obviously enhanced by one or two orders of magnitude on the laser fabricated surfaces compared with that of the unprocessed blank samples.","PeriodicalId":46010,"journal":{"name":"Advanced Optical Technologies","volume":"9 1","pages":"100 - 89"},"PeriodicalIF":1.8,"publicationDate":"2020-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1515/aot-2019-0072","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48561866","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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