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Applications of Optics and Photonics最新文献

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Effect of laser pulse duration on ablation efficiency of hard bone in microseconds regime 微秒级激光脉冲时间对硬骨消融效率的影响
Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272253
L. Beltrán, Hamed Abbasi, G. Rauter, N. Friederich, P. Cattin, A. Zam
{"title":"Effect of laser pulse duration on ablation efficiency of hard bone in microseconds regime","authors":"L. Beltrán, Hamed Abbasi, G. Rauter, N. Friederich, P. Cattin, A. Zam","doi":"10.1117/12.2272253","DOIUrl":"https://doi.org/10.1117/12.2272253","url":null,"abstract":"The aim of the present study is to investigate the effect of laser pulse duration on ablation efficiency of hard bones. The bones were ablated using a microsecond pulsed Er-YAG laser. The laser wavelength was 2.94 μm and the repetition rate was 10Hz. Three samples of porcine femur were used and several areas were ablated with a fixed pulse energy of 280mJ and different pulse durations. The ablation procedure was applied during five seconds for all the experiments, therefore, the same amount of energy (14 J) was deposited in each trial. The ablation efficiency was determined by measuring the ablated volume per second for each experiment.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129566064","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: 12
A model for prediction of color change after tooth bleaching based on CIELAB color space 基于CIELAB颜色空间的牙齿漂白后颜色变化预测模型
Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272680
L. J. Herrera, J. Santana, A. Yebra, M. J. Rivas, R. Pulgar, M. M. Pérez
{"title":"A model for prediction of color change after tooth bleaching based on CIELAB color space","authors":"L. J. Herrera, J. Santana, A. Yebra, M. J. Rivas, R. Pulgar, M. M. Pérez","doi":"10.1117/12.2272680","DOIUrl":"https://doi.org/10.1117/12.2272680","url":null,"abstract":"An experimental study aiming to develop a model based on CIELAB color space for prediction of color change after a tooth bleaching procedure is presented. Multivariate linear regression models were obtained to predict the L*, a*, b* and W* post-bleaching values using the pre-bleaching L*, a*and b*values. Moreover, univariate linear regression models were obtained to predict the variation in chroma (C*), hue angle (h°) and W*. The results demonstrated that is possible to estimate color change when using a carbamide peroxide tooth-bleaching system. The models obtained can be applied in clinic to predict the colour change after bleaching.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117023052","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
Direct formation of nanostructures by focused electron beam on a surface of thin metallic films 利用聚焦电子束在金属薄膜表面直接形成纳米结构
Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2275961
J. Sniķeris, V. Gerbreders
{"title":"Direct formation of nanostructures by focused electron beam on a surface of thin metallic films","authors":"J. Sniķeris, V. Gerbreders","doi":"10.1117/12.2275961","DOIUrl":"https://doi.org/10.1117/12.2275961","url":null,"abstract":"This paper describes a method, which allows obtaining metallic nanostructures (MN) by focused electron beam irradiation in scanning electron microscope (SEM) in one fabrication step and without the use of additional chemicals. MN-nanodots were obtained by 30kV SEM on surfaces of various metallic thin films (Al, Cr, Cu, Mo, Ag). The thin films were prepared by direct current magnetron sputtering on Si substrate with 500 nm thickness. The size and shape of the obtained MN were measured with atomic force microscope. The height of the nanodots was up to 500 nm and their width at half height was in a range from 100 to 500 nm. The size of the obtained MN depends on the parameters of electron beam and properties of the metal. Possible mechanisms of MN forming under the influence of focused electron beam are discussed.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114779745","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: 4
Organic semiconductor rubrene thin films deposited by pulsed laser evaporation of solidified solutions 脉冲激光蒸发固化溶液沉积有机半导体rubrene薄膜
Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2276250
N. Majewska, M. Gazda, R. Jendrzejewski, S. Majumdar, M. Sawczak, G. Śliwiński
{"title":"Organic semiconductor rubrene thin films deposited by pulsed laser evaporation of solidified solutions","authors":"N. Majewska, M. Gazda, R. Jendrzejewski, S. Majumdar, M. Sawczak, G. Śliwiński","doi":"10.1117/12.2276250","DOIUrl":"https://doi.org/10.1117/12.2276250","url":null,"abstract":"Organic semiconductor rubrene (C42H28) belongs to most preferred spintronic materials because of the high charge carrier mobility up to 40 cm2(V·s)-1. However, the fabrication of a defect-free, polycrystalline rubrene for spintronic applications represents a difficult task. We report preparation and properties of rubrene thin films deposited by pulsed laser evaporation of solidified solutions. Samples of rubrene dissolved in aromatic solvents toluene, xylene, dichloromethane and 1,1-dichloroethane (0.23-1% wt) were cooled to temperatures in the range of 16.5-163 K and served as targets. The target ablation was provided by a pulsed 1064 nm or 266 nm laser. For films of thickness up to 100 nm deposited on Si, glass and ITO glass substrates, the Raman and AFM data show presence of the mixed crystalline and amorphous rubrene phases. Agglomerates of rubrene crystals are revealed by SEM observation too, and presence of oxide/peroxide (C42H28O2) in the films is concluded from matrix-assisted laser desorption/ionization time-of-flight spectroscopic analysis.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122060906","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
Spatio-temporal processing of ultra-short pulses with micro optics 超短脉冲的微光学时空处理
Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2275125
J. Jahns
{"title":"Spatio-temporal processing of ultra-short pulses with micro optics","authors":"J. Jahns","doi":"10.1117/12.2275125","DOIUrl":"https://doi.org/10.1117/12.2275125","url":null,"abstract":"Ultrashort pulses with time durations on the femtosecond scale can be suitably processed by microoptical devices. The temporal impulse response of an element is determined by its spatial structure, its action in the temporal domain can be conveniently described by its impulse response. All categories of elements can be used: refractive, diffractive and reflective. Here, the basic concepts are discussed and several examples for shaping and filtering short pulses are presented.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"113 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126032437","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
Influence of a perturbation in the Gyrator domain for a joint transform correlator-based encryption system 陀螺域微扰对联合变换相关器加密系统的影响
Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2275947
J. Vilardy, M. S. Millán, E. Pérez-Cabré
{"title":"Influence of a perturbation in the Gyrator domain for a joint transform correlator-based encryption system","authors":"J. Vilardy, M. S. Millán, E. Pérez-Cabré","doi":"10.1117/12.2275947","DOIUrl":"https://doi.org/10.1117/12.2275947","url":null,"abstract":"We present the results of the noise and occlusion tests in the Gyrator domain (GD) for a joint transform correlator-based encryption system. This encryption system was recently proposed and it was implemented by using a fully phase nonzero-order joint transform correlator (JTC) and the Gyrator transform (GT). The decryption system was based on two successive GTs. In this paper, we make several numerical simulations in order to test the performance and robustness of the JTC-based encryption-decryption system in the GD when the encrypted image is corrupted by noise or occlusion. The encrypted image is affected by additive and multiplicative noise. We also test the effect of data loss due to partial occlusion of the encrypted information. Finally, we evaluate the performance and robustness of the encryption-decryption system in the GD by using the metric of the root mean square error (RMSE) between the original image and the decrypted image when the encrypted image is degraded by noise or modified by occlusion.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"133 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124272839","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
Tunable light fluids using quantum atomic optical systems 使用量子原子光学系统的可调光流体
Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272061
N. Silva, T. Ferreira, J. C. Costa, M. Gomes, R. Alves, A. Guerreiro
{"title":"Tunable light fluids using quantum atomic optical systems","authors":"N. Silva, T. Ferreira, J. C. Costa, M. Gomes, R. Alves, A. Guerreiro","doi":"10.1117/12.2272061","DOIUrl":"https://doi.org/10.1117/12.2272061","url":null,"abstract":"The realization of tabletop optical analogue experiments of superfluidity relies on the engineering of suitable optical media, with tailored optical properties. This work shows how quantum atomic optical systems can be used to develop highly tunable optical media, with localized control of both linear and nonlinear susceptibility. Introducing the hydrodynamic description of light, the superfluidity of light in these atomic media is investigated through GPU-enhanced numerical simulations, with the numeric observation of the superfluidic signature of suppressed scattering through a defect.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124617786","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
Design of low loss photonic crystal fiber based on porous-core with elliptical holes in THz regime 太赫兹区椭圆孔多孔光子晶体光纤的设计
Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2276427
E. Reyes-Vera, J. Úsuga-Restrepo, J. Zuñiga-Bedoya, J. F. Botero-Cadavid
{"title":"Design of low loss photonic crystal fiber based on porous-core with elliptical holes in THz regime","authors":"E. Reyes-Vera, J. Úsuga-Restrepo, J. Zuñiga-Bedoya, J. F. Botero-Cadavid","doi":"10.1117/12.2276427","DOIUrl":"https://doi.org/10.1117/12.2276427","url":null,"abstract":"In this work, we present a new design of a low loss and high birefringence THz Photonic Crystal Fiber (PCF) made of TOPAS material, featuring a porous core with elliptical holes. The full-vector finite element method was employed to analyze the optical properties such as birefringence, confinement losses, and effective material losses; as well as to study how these parameters are dependent on the geometry of the structure. The simulation results showed confinement losses ≈ 0.06 dB/m when a configuration with high grade of porosity in the core was implemented. At the same time, birefringence values close to 3×10-2 there were obtained. The proposed design can be fabricated easily using standard stack and draw technique and be used in several applications in the THz region to propagate the radiation.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124654602","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: 3
Electromagnetic simulation of amorphous silicon waveguides 非晶硅波导的电磁模拟
Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2272000
P. Lourenço, A. Fantoni, P. Pinho
{"title":"Electromagnetic simulation of amorphous silicon waveguides","authors":"P. Lourenço, A. Fantoni, P. Pinho","doi":"10.1117/12.2272000","DOIUrl":"https://doi.org/10.1117/12.2272000","url":null,"abstract":"In the past several decades, the Finite-Difference Time-Domain (FDTD) method has become one of the most powerful numerical techniques in solving the Maxwell’s curl equations and has been widely applied to solve complex optical and photonic problems. This method divides space and time into a regular grid and simulates the time evolution of Maxwell’s equations. This paper reports some results, obtained by a set of FDTD simulations, about the characteristics of amorphous silicon waveguides embedded in a SiO2 cladding. Light absorption dependence on the material properties and waveguide curvature radius are analysed for wavelengths in the infrared spectrum. Wavelength transmission efficiency is determined analysing the decay of the light power along the waveguides and the obtained results show that total losses should remain within acceptable limits when considering curvature radius as small as 3 μm at its most.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115447843","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
Visible light communication and indoor positioning using a-SiCH device as receiver 使用a-SiCH设备作为接收机的可见光通信和室内定位
Applications of Optics and Photonics Pub Date : 2017-08-22 DOI: 10.1117/12.2271362
M. Vieira, M. Vieira, P. Louro, P. Vieira, A. Fantoni
{"title":"Visible light communication and indoor positioning using a-SiCH device as receiver","authors":"M. Vieira, M. Vieira, P. Louro, P. Vieira, A. Fantoni","doi":"10.1117/12.2271362","DOIUrl":"https://doi.org/10.1117/12.2271362","url":null,"abstract":"An indoor positioning system were trichromatic white LEDs are used both for illumination proposes and as transmitters and an optical processor, based on a-SiC:H technology, as mobile receiver is presented. OOK modulation scheme is used, and it provides a good trade-off between system performance and implementation complexity. The relationship between the transmitted data and the received digital output levels is decoded. The system topology for positioning is a self-positioning system in which the measuring unit is mobile. This unit receives the signals of several transmitters in known locations, and has the capability to compute its location based on the measured signals. LED bulbs work as transmitters, sending information together with different IDs related to their physical locations. A triangular topology for the unit cell is analysed. A 2D localization design, demonstrated by a prototype implementation is presented. Fine-grained indoor localization is tested. The received signal is used in coded multiplexing techniques for supporting communications and navigation concomitantly on the same channel. The position is estimated through the visible multilateration metodh using several non-collinear transmitters. The location and motion information is found by mapping position and estimates the location areas. Data analysis showed that by using a pinpin double photodiode based on a a-SiC:H heterostucture as receiver, and RBGLEDs as transmitters it is possible not only to determine the mobile target’s position but also to infer the motion direction over time, along with the received information in each position.","PeriodicalId":150522,"journal":{"name":"Applications of Optics and Photonics","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-08-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116366836","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
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