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2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)最新文献

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On the use of OCT to examine the varnish layer of paintings cleaned with an Er:YAG laser 利用OCT检查Er:YAG激光清洗的绘画清漆层
2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS) Pub Date : 2016-12-02 DOI: 10.5220/0005729801070112
A. Decruz, J. Izatt, D. Nankivil
{"title":"On the use of OCT to examine the varnish layer of paintings cleaned with an Er:YAG laser","authors":"A. Decruz, J. Izatt, D. Nankivil","doi":"10.5220/0005729801070112","DOIUrl":"https://doi.org/10.5220/0005729801070112","url":null,"abstract":"Optical Coherence Tomography (OCT) was used to visualize and quantify the varnish layer of paintings. And to verify the success of efforts by conservators to remove the varnish using laser ablation. An Er:YAG laser (λ = 2.94μm) with a repetition rate of 15Hz and an optical power of ImW was used to remove the varnish. A spectral domain OCT system with a Michelson topology was constructed using a broadband super-luminescent diode (λ = 840±25nm). The OCT system provided an 8μm resolution, and a field of view of 5×5mm. Samples, including pigment, varnish and substrate, approximately 1mm2 in size, were removed from the oil painting, San Giorgio Maggiore by Martin Rico (1833–1908). Varnish thickness obtained from OCT was validated by similar measurements obtained from SEM analysis. Other paintings, including a late 18th century landscape, signed Thomas Gainsborough, were imaged with OCT to compare neighboring regions before and after laser treatment and to examine the layering of the artist's signature in an effort to determine its authenticity. In conclusion, the non-invasive OCT technique is an efficient tool for measurement of varnish layer thickness, for imaging over-paint under varnish layers, and for assessing the effectiveness of laser assisted varnish removal.","PeriodicalId":222009,"journal":{"name":"2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130364313","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}
引用次数: 2
Near-infrared silicon Schottky photodiodes based on non-metallic materials 基于非金属材料的近红外硅肖特基光电二极管
2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS) Pub Date : 2016-12-01 DOI: 10.5220/0005740902590263
M. Casalino, M. Gioffré, M. Iodice, S. Rao, G. Coppola
{"title":"Near-infrared silicon Schottky photodiodes based on non-metallic materials","authors":"M. Casalino, M. Gioffré, M. Iodice, S. Rao, G. Coppola","doi":"10.5220/0005740902590263","DOIUrl":"https://doi.org/10.5220/0005740902590263","url":null,"abstract":"In this work we have investigated the performance of Schottky photodetectors based on materials non-conventionally used to detect near-infrared wavelengths. In the proposed devices the absorption mechanism is based on the internal photoemission effect. Both three-dimensional (sputtered erbium and evaporated germanium) and two-dimensional materials (graphene) have been considered and their performance compared. Our insights show that silicon Schottky photodetectors have the potentialities to play a key role in the telecommunications opening new frontiers in the field of low-cost silicon photonics.","PeriodicalId":222009,"journal":{"name":"2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129445865","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}
引用次数: 0
Imaging characteristics of the axicon imaging system 轴突成像系统的成像特性
2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS) Pub Date : 2016-11-30 DOI: 10.5220/0005742201350139
Zhongsheng Zhai, Q. Lv, Xuanze Wang, Liangen Yang, Zhongbao Xu, He Tao
{"title":"Imaging characteristics of the axicon imaging system","authors":"Zhongsheng Zhai, Q. Lv, Xuanze Wang, Liangen Yang, Zhongbao Xu, He Tao","doi":"10.5220/0005742201350139","DOIUrl":"https://doi.org/10.5220/0005742201350139","url":null,"abstract":"The depth of an image system can be extended by an axicon which can generate line focus. According to physical optical theory, the diffracting patterns of the defocus point spread function (PSF) for the imaging system with axicon are analyzed through the generalize pupil function. The expressions of the PSF for the imaging system illuminated by white light are described as the superposition of the intensities in individual monochromatic patterns. Experimental results show that the central portion contains the most energy of the diffraction pattern from the PSF produced by the white light, and the contrast of secondary outside circular rings decreased rapidly. Furthermore, the central spot radius varied slowly with the increase of defocus parameter, and the depth of field of the imaging system is effectively extended with a shortcoming that the images need further processing.","PeriodicalId":222009,"journal":{"name":"2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116813649","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}
引用次数: 0
High perfomance integrated temperature sensor based on amorphous silicon diode for photonics on CMOS 基于CMOS的非晶硅光子二极管的高性能集成温度传感器
2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS) Pub Date : 2016-11-29 DOI: 10.5220/0005744903690372
S. Rao, G. Pangallo, Francesco Delia Corte
{"title":"High perfomance integrated temperature sensor based on amorphous silicon diode for photonics on CMOS","authors":"S. Rao, G. Pangallo, Francesco Delia Corte","doi":"10.5220/0005744903690372","DOIUrl":"https://doi.org/10.5220/0005744903690372","url":null,"abstract":"A temperature sensor based on a photonic layer-integrated hydrogenated amorphous silicon p-i-n diode is presented. The linear dependence of the voltage drop across the forward-biased diode on temperature, in a range from 30 °C up to 170 °C, has been used for thermal sensing. A high sensitivity of 11.9 mV/°C in a biasing current range ≈34–40 nA has been measured.","PeriodicalId":222009,"journal":{"name":"2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115976583","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}
引用次数: 1
Electron beam sustained plasma as a medium for amplification of electromagnetic radiation in subterahertz frequency band 电子束持续等离子体作为放大亚太赫兹频段电磁辐射的介质
2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS) Pub Date : 2016-11-28 DOI: 10.5220/0005646702810288
A. Bogatskaya, A. Popov
{"title":"Electron beam sustained plasma as a medium for amplification of electromagnetic radiation in subterahertz frequency band","authors":"A. Bogatskaya, A. Popov","doi":"10.5220/0005646702810288","DOIUrl":"https://doi.org/10.5220/0005646702810288","url":null,"abstract":"It is demonstrated that low-temperature weakly-ionized nonequilibrium plasma created by a high-energy electron beam in gases (gas mixtures) with Ramsauer minimum in a transport cross section and effective attachment of slow electrons can be used as a medium for amplification and generation of electromagnetic radiation in subterahertz frequency band. Analysis of the electron energy distribution function (EEDF) in Xe — F2 mixture is performed. Energy interval with growing EEDF is found to exist in such a mixture. Such an interval provides the existence of population inversion of the electron spectrum in continuum and is responsible for positive value of a gain factor of microwave radiation. A gain factor depending on an amplified radiation frequency and plasma parameters is analysed.","PeriodicalId":222009,"journal":{"name":"2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116986765","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}
引用次数: 0
Optimizing energy absorption for ultrashort pulse laser ablation of fused silica 超短脉冲激光烧蚀熔融二氧化硅的能量吸收优化
2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS) Pub Date : 2016-11-28 DOI: 10.5220/0005685300690073
N. Sanner, M. Lebugle, N. Varkentina, M. Sentis, O. Uteza
{"title":"Optimizing energy absorption for ultrashort pulse laser ablation of fused silica","authors":"N. Sanner, M. Lebugle, N. Varkentina, M. Sentis, O. Uteza","doi":"10.5220/0005685300690073","DOIUrl":"https://doi.org/10.5220/0005685300690073","url":null,"abstract":"We investigate the ultrafast absorption of fused silica irradiated by a single 500 fs laser pulse in the context of micromachining applications. As the absorption of the laser energy is rapid (∼fs), the optical properties of the material evolve during the laser pulse, thereby yielding a feedback on the dynamics of absorption and consequently on the amount of energy that is absorbed. Through complete investigation of energy absorption, by combining “pump depletion” and “pump-probe” experiments in a wide range of incident fluences above the ablation threshold, we demonstrate the existence of an optimal fluence range, enabling to turn transiently the material into a state such that each photon is optimally utilized for ablation.","PeriodicalId":222009,"journal":{"name":"2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131488682","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}
引用次数: 0
Improvement of perovskite solar cells photovoltaic performance by localized surface plasmon effect of silver-alumina core-shell nanoparticles 利用银-氧化铝核壳纳米粒子局部表面等离子体效应改善钙钛矿太阳能电池光伏性能
2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS) Pub Date : 2016-11-28 DOI: 10.5220/0005792802700272
Marziyeh Yaghubinia, Majid Ebnali, M. Zendehdel, Mohammadreza Yaghoubinia
{"title":"Improvement of perovskite solar cells photovoltaic performance by localized surface plasmon effect of silver-alumina core-shell nanoparticles","authors":"Marziyeh Yaghubinia, Majid Ebnali, M. Zendehdel, Mohammadreza Yaghoubinia","doi":"10.5220/0005792802700272","DOIUrl":"https://doi.org/10.5220/0005792802700272","url":null,"abstract":"Perovskite solar cells are new generation of nano structure-based solar devices that could reach to highest efficiency records between third generation solar cells. In present project, for the first time, enhancement of the photovoltaic performance of planner perovskite solar cells is achieved by using localized surface Plasmon (LSP) effect of silver-alumina core-shell nanoparticles as a dopant in the perovskite layer. Photovoltaic performances of the devices are evaluated by FE-SEM, IV measurement, cyclic voltammetry, UV-Vis spectroscopy and electrochemical impedance spectroscopy. The results show significant increase of the overall efficiency and short-circuit current density of the devices by using LSP effect of Ag-Al2O3 nanoparticles.","PeriodicalId":222009,"journal":{"name":"2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"50 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123208237","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}
引用次数: 5
Manufacturing and optimization of sol-gel-based TiO2-SiO2 thin Films as high refractive index overlays for long period grating-based biosensing 溶胶-凝胶型TiO2-SiO2高折射率薄膜的制备与优化
2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS) Pub Date : 2016-11-28 DOI: 10.5220/0005844103490355
P. Biswas, F. Chiavaioli, S. Jana, S. Bandyopadhyay, N. Basumallick, A. Giannetti, S. Tombelli, S. Bera, A. Mallick, F. Baldini, C. Trono
{"title":"Manufacturing and optimization of sol-gel-based TiO2-SiO2 thin Films as high refractive index overlays for long period grating-based biosensing","authors":"P. Biswas, F. Chiavaioli, S. Jana, S. Bandyopadhyay, N. Basumallick, A. Giannetti, S. Tombelli, S. Bera, A. Mallick, F. Baldini, C. Trono","doi":"10.5220/0005844103490355","DOIUrl":"https://doi.org/10.5220/0005844103490355","url":null,"abstract":"The manufacturing procedure and the optimization of high refractive index overlays for long period grating-based sensors are reported. The overlay consists of a sol-gel-based TiO2-SiO2 thin film. By carefully tuning the overlay thickness and refractive index, it is possible to bring the LPG in the so-called transition mode working region, and to optimize and maximize the LPG sensing performances. LPGs are here characterized as optical refractometers, and, after a suitable functionalization of the sol-gel coated fiber surface, as biosensors performing an IgG/anti-IgG bioassay.","PeriodicalId":222009,"journal":{"name":"2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133781638","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}
引用次数: 0
Optimization of non-diffractive beam propagation in random media formed by annular beam 环形光束在随机介质中的非衍射传播优化
2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS) Pub Date : 2016-11-27 DOI: 10.5220/0005683300620068
Ziqi Peng, T. Shiina
{"title":"Optimization of non-diffractive beam propagation in random media formed by annular beam","authors":"Ziqi Peng, T. Shiina","doi":"10.5220/0005683300620068","DOIUrl":"https://doi.org/10.5220/0005683300620068","url":null,"abstract":"Light is quite difficult to propagate a long distance in random media such as human tissue or atmospheric dense cloud because of its scattering and absorption. For optical sensing, it is important to increase propagation efficiency which means expanding the sensing range. An annular beam can transform its waveform into a non-diffractive beam due to its propagation in a long distance. In our previous work, we found the annular beam also had non-diffractive effect when it propagated in diluted milk solution of a few tens centimetres at the concentration of less than 1%. In this study, to clear up how to control and optimize the non-diffractive effect of the annular beam in random media, numerical calculation of propagation characteristics of annular beam in air was estimated. The narrow annular beam with a small diameter would generate a high intensity non-diffractive beam at a short distance. We also had three sets of experiments of annular beam propagation in random media with the same view point as the calculation, but its propagation characteristics was evaluated by milk concentration. They showed the same variation of a non-diffractive beam with the result of numerical calculation in air. These results provide us a hint of optimization for annular beam propagation in random media.","PeriodicalId":222009,"journal":{"name":"2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121910648","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}
引用次数: 2
Characteristics of phase-shifted fiber Bragg grating inscribed by fusion splicing technique and femtosecond laser 融合拼接技术和飞秒激光刻相移光纤光栅的特性
2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS) Pub Date : 2016-11-26 DOI: 10.5220/0005738503560360
Yajun Jiang, Jian Xu, Yuan Yuan, Dexing Yang, Dong Li, Meirong Wang, Jianlin Zhao
{"title":"Characteristics of phase-shifted fiber Bragg grating inscribed by fusion splicing technique and femtosecond laser","authors":"Yajun Jiang, Jian Xu, Yuan Yuan, Dexing Yang, Dong Li, Meirong Wang, Jianlin Zhao","doi":"10.5220/0005738503560360","DOIUrl":"https://doi.org/10.5220/0005738503560360","url":null,"abstract":"Phase-shifted fiber Bragg grating (PS-FBG) inscription in nonphotosensitive single mode fiber (SMF) by the fusion splicing technique and femtosecond laser is reported. Two SMFs are fusion spliced to introduce a refractive index modulation point which acts as a phase shift, then exposing the fusion spliced fiber with femtosecond laser and a uniform phase mask. Two dips can be observed in the transmission spectrum of inscribed grating, and the max induced refractive index modulation can reach to 4.2×10−4 without any fiber sensitization for a peak power density of 4.5×1013 W/cm2. The annealing tests show that type I PS-FBG is successfully inscribed. This type of grating also shows good strain and pressure characteristics. Such PS-FBGs can be potentially used for optical fiber lasers, filters and sensors.","PeriodicalId":222009,"journal":{"name":"2016 4th International Conference on Photonics, Optics and Laser Technology (PHOTOPTICS)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2016-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126361336","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}
引用次数: 2
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