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Simulation of active Brownian particles in optical potentials 光势中活跃布朗粒子的模拟
Optics & Photonics - NanoScience + Engineering Pub Date : 2014-09-16 DOI: 10.1117/12.2061049
G. Volpe, S. Gigan, G. Volpe
{"title":"Simulation of active Brownian particles in optical potentials","authors":"G. Volpe, S. Gigan, G. Volpe","doi":"10.1117/12.2061049","DOIUrl":"https://doi.org/10.1117/12.2061049","url":null,"abstract":"Optical forces can affect the motion of a Brownian particle. For example, optical tweezers use optical forces to trap a particle at a desirable position. Unlike passive Brownian particles, active Brownian particles, also known as microswimmers, propel themselves with directed motion and thus drive themselves out of equilibrium. Understanding their motion in a confined potential can provide insight into out-of-equilibrium phenomena associated with biological examples such as bacteria, as well as with artificial microswimmers. We discuss how to mathematically model their motion in an optical potential using a set of stochastic differential equations and how to numerically simulate it using the corresponding set of finite difference equations.","PeriodicalId":128143,"journal":{"name":"Optics & Photonics - NanoScience + Engineering","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130836802","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
Hybrid optical and acoustic force based sorting 基于光学和声力的混合分选
Optics & Photonics - NanoScience + Engineering Pub Date : 2014-09-16 DOI: 10.1117/12.2064276
P. O’Mahoney, G. Brodie, Han Wang, C. Démoré, S. Cochran, G. Spalding, M. Macdonald
{"title":"Hybrid optical and acoustic force based sorting","authors":"P. O’Mahoney, G. Brodie, Han Wang, C. Démoré, S. Cochran, G. Spalding, M. Macdonald","doi":"10.1117/12.2064276","DOIUrl":"https://doi.org/10.1117/12.2064276","url":null,"abstract":"We report the combined use of optical sorting and acoustic levitation to give particle sorting. Differing sizes of microparticles are sorted optically both with and without the aid of acoustic levitation, and the results compared to show that the use of acoustic trapping can increase sorting efficiency. The use of a transparent ultrasonic transducer is also shown to streamline the integration of optics and acoustics. We also demonstrate the balance of optical radiation pressure and acoustic levitation to achieve vertical sorting.","PeriodicalId":128143,"journal":{"name":"Optics & Photonics - NanoScience + Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132977882","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
Force dependence of phagosome trafficking in retinal pigment epithelial cells 视网膜色素上皮细胞吞噬体转运的力依赖性
Optics & Photonics - NanoScience + Engineering Pub Date : 2014-09-16 DOI: 10.1117/12.2062055
Rebekah Daniel, A. Koll, David G. Altman
{"title":"Force dependence of phagosome trafficking in retinal pigment epithelial cells","authors":"Rebekah Daniel, A. Koll, David G. Altman","doi":"10.1117/12.2062055","DOIUrl":"https://doi.org/10.1117/12.2062055","url":null,"abstract":"Retinal pigment epithelial (RPE) cells play an integral role in the renewal of photoreceptor disk membranes. As rod and cone cells shed their outer segments, they are phagocytosed and degraded by the RPE, and a failure in this process can result in retinal degeneration. We have studied the role of myosin VI in nonspecific phagocytosis in a human RPE primary cell line (ARPE-19), testing the hypothesis that this motor generates the forces required to traffic phagosomes in these cells. Experiments were conducted in the presence of forces through the use of in vivo optical trapping. Our results support a role for myosin VI in phagosome trafficking and demonstrate that applied forces modulate rates of phagosome trafficking.","PeriodicalId":128143,"journal":{"name":"Optics & Photonics - NanoScience + Engineering","volume":"60 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133284983","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
Einstein's osmotic equilibrium of colloidal suspensions in conservative force fields 爱因斯坦在保守力场中胶体悬浮液的渗透平衡
Optics & Photonics - NanoScience + Engineering Pub Date : 2014-09-16 DOI: 10.1117/12.2062169
Jinxin Fu, H. Ou-yang
{"title":"Einstein's osmotic equilibrium of colloidal suspensions in conservative force fields","authors":"Jinxin Fu, H. Ou-yang","doi":"10.1117/12.2062169","DOIUrl":"https://doi.org/10.1117/12.2062169","url":null,"abstract":"Predicted by Einstein in his 1905 paper on Brownian motion, colloidal particles in suspension reach osmotic equilibrium under gravity. The idea was demonstrated by J.B. Perrin to win Nobel Prize in Physics in 1926. We show Einstein’s equation for osmotic equilibrium can be applied to colloids in a conservative force field generated by optical gradient forces. We measure the osmotic equation of state of 100nm Polystyrene latex particles in the presence of KCl salt and PEG polymer. We also obtain the osmotic compressibility, which is important for determining colloidal stability and the internal chemical potential, which is useful for predicting the phase transition of colloidal systems. This generalization allows for the use of any conservative force fields for systems ranging from colloidal systems to macromolecular solutions.","PeriodicalId":128143,"journal":{"name":"Optics & Photonics - NanoScience + Engineering","volume":"56 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114852059","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
Observation of the rotational Doppler effect from an optically trapped micro-particle 光学捕获微粒旋转多普勒效应的观察
Optics & Photonics - NanoScience + Engineering Pub Date : 2014-09-16 DOI: 10.1117/12.2061994
David B. Phillips, Michael P. Lee, F. Speirits, S. Barnett, Stephen H. Simpson, M. Lavery, M. Padgett, G. Gibson
{"title":"Observation of the rotational Doppler effect from an optically trapped micro-particle","authors":"David B. Phillips, Michael P. Lee, F. Speirits, S. Barnett, Stephen H. Simpson, M. Lavery, M. Padgett, G. Gibson","doi":"10.1117/12.2061994","DOIUrl":"https://doi.org/10.1117/12.2061994","url":null,"abstract":"The linear Doppler shift forms the basis of various sensor types for the measurement of linear velocity, ranging from speeding cars to fluid flow. Recently, a rotational analogue was demonstrated, enabling the measurement of angular velocity using light carrying orbital angular momentum (OAM). If measurement of the light scattered from a spinning object is restricted to a defined OAM state, then a frequency shift is observed that scales with the rotation rate of the object and the OAM of the scattered photon. In this work we measure the rotational Doppler shift from micron-sized calcite particles spinning in an optical trap at tens of Hz. In this case the signal is complicated by the geometry of the rotating particle, and the effect of Brownian motion. By careful consideration of these influences, we show how the signal is robust to both, representing a new technique with which to probe the rotational motion of micro-scale particles.","PeriodicalId":128143,"journal":{"name":"Optics & Photonics - NanoScience + Engineering","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114406594","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
Optical characterization of CMOS compatible micro optics fabricated by mask-based and mask-less hybrid lithography 基于掩模和无掩模混合光刻技术制备CMOS兼容微光学器件的光学特性
Optics & Photonics - NanoScience + Engineering Pub Date : 2014-09-15 DOI: 10.1117/12.2062414
Sung-Yuen Wang, C. Summitt, L. Johnson, Melissa Zaverton, T. Milster, Y. Takashima
{"title":"Optical characterization of CMOS compatible micro optics fabricated by mask-based and mask-less hybrid lithography","authors":"Sung-Yuen Wang, C. Summitt, L. Johnson, Melissa Zaverton, T. Milster, Y. Takashima","doi":"10.1117/12.2062414","DOIUrl":"https://doi.org/10.1117/12.2062414","url":null,"abstract":"We report a CMOS compatible fabrication and optical characterization of the micrometer scale optical coupler, a 45° mirror-based optical coupler for inter-layer optical coupling. A newly proposed mask-based and mask-less hybrid lithography process enables accurate surface profile of the micrometer sized 45° mirror by using a CMOS compatible buffer coat material. Surface profile inspected by an optical interferometry agrees well with SEM based inspection results. Experimental and theoretical results for routing and coupling of laser beam in 90° will be discussed.","PeriodicalId":128143,"journal":{"name":"Optics & Photonics - NanoScience + Engineering","volume":"488 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126008979","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
Thermo-active polymer nanocomposites: a spectroscopic study 热敏聚合物纳米复合材料的光谱研究
Optics & Photonics - NanoScience + Engineering Pub Date : 2014-09-15 DOI: 10.1117/12.2064904
A. D. Winter, E. Larios, C. Jaye, D. Fischer, M. Omastová, E. Campo
{"title":"Thermo-active polymer nanocomposites: a spectroscopic study","authors":"A. D. Winter, E. Larios, C. Jaye, D. Fischer, M. Omastová, E. Campo","doi":"10.1117/12.2064904","DOIUrl":"https://doi.org/10.1117/12.2064904","url":null,"abstract":"Photo- and thermo-mechanical actuation behaviour in specific polymer-carbon nanotube composites has been observed in recent years and studied at the macroscale. These systems may prove to be suitable components for a wide range of applications, from MOEMs and nanotechnology to neuroscience and tissue engineering. Absence of a unified model for actuation behaviour at a molecular level is hindering development of such smart materials. We observed thermomechanical actuation of ethylene-vinyl acetate | carbon nanotube composites through in situ near-edge X-ray absorption fine structure spectroscopy to correlate spectral trends with macroscopic observations. This paper presents spectra of composites and constituents at room temperature to identify resonances in a building block model, followed by spectra acquired during thermo-actuation. Effects of strain-induced filler alignment are also addressed. Spectral resonances associated with C=C and C=O groups underwent synchronised intensity variations during excitation, and were used to propose a conformational model of actuation based on carbon nanotube torsion. Future actuation studies on other active polymer nanocomposites will verify the universality of the proposed model.","PeriodicalId":128143,"journal":{"name":"Optics & Photonics - NanoScience + Engineering","volume":"8 12","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132581423","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
Polymer-carbon nanotube composites: electrospinning, alignment and interactions 聚合物-碳纳米管复合材料:静电纺丝、排列和相互作用
Optics & Photonics - NanoScience + Engineering Pub Date : 2014-09-15 DOI: 10.1117/12.2064905
A. D. Winter, E. Larios, F. Alamgir, C. Jaye, D. Fischer, E. Campo
{"title":"Polymer-carbon nanotube composites: electrospinning, alignment and interactions","authors":"A. D. Winter, E. Larios, F. Alamgir, C. Jaye, D. Fischer, E. Campo","doi":"10.1117/12.2064905","DOIUrl":"https://doi.org/10.1117/12.2064905","url":null,"abstract":"The possibility of novel nanocomposite materials with dramatically improved properties requires fundamental studies of interactions. Full elucidation of these concepts will allow the tailoring of such systems for particular applications. Using near-edge X-ray absorption fine structure spectroscopy, we investigated interactions in electrospun poly(dimethylsiloxane)-poly(methyl methacrylate)-multiwall carbon nanotube composites. This paper describes these interactions through a building-block model, addresses their dependence upon filler size, and discusses electrospinning as an alignment solution. Though alignment of filler and polymeric chains was not observed spectrally, SEM imaging confirmed uniaxial carbon nanotube alignment in composite fibres. Spectra acquired at different incidence angles revealed differences in energy and intensity of resonances, suggesting conformational configurations. These differences were more significant in composites with larger nanofiller. This supported proposed models of CH-π interactions and hydrogen bonding as adhesion mechanisms.","PeriodicalId":128143,"journal":{"name":"Optics & Photonics - NanoScience + Engineering","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128586980","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
Dielectric and metallic nanosuspensions with tunable optical nonlinearities 具有可调谐光学非线性的介电和金属纳米悬浮液
Optics & Photonics - NanoScience + Engineering Pub Date : 2014-09-12 DOI: 10.1117/12.2061514
S. Fardad, W. Man, Ze Zhang, A. Salandrino, M. Heinrich, Zhigang Chen, D. Christodoulides
{"title":"Dielectric and metallic nanosuspensions with tunable optical nonlinearities","authors":"S. Fardad, W. Man, Ze Zhang, A. Salandrino, M. Heinrich, Zhigang Chen, D. Christodoulides","doi":"10.1117/12.2061514","DOIUrl":"https://doi.org/10.1117/12.2061514","url":null,"abstract":"We provide a brief report on our recent work on dielectric and metallic colloidal nanosuspensions with negative polarizability where we observed robust propagation of self-trapped light over a long distance. Our results open up new opportunities in developing soft-matter systems with tunable optical nonlinearities.","PeriodicalId":128143,"journal":{"name":"Optics & Photonics - NanoScience + Engineering","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125215417","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
Temperature dependent surface modification of silica spheres with methacrylate 甲基丙烯酸酯对二氧化硅球的温度依赖性表面改性
Optics & Photonics - NanoScience + Engineering Pub Date : 2014-09-12 DOI: 10.1117/12.2061456
K. Kang, Byoung-Ju Kim, D. Jo, Sae-Han Lim, Jin-Young Park, Do-gyun Kim
{"title":"Temperature dependent surface modification of silica spheres with methacrylate","authors":"K. Kang, Byoung-Ju Kim, D. Jo, Sae-Han Lim, Jin-Young Park, Do-gyun Kim","doi":"10.1117/12.2061456","DOIUrl":"https://doi.org/10.1117/12.2061456","url":null,"abstract":"Surface modification of silica spheres with 3-(Trimethoxysilyl)propylmethacrylate (TMSPM) has been performed at ambient condition. However, the FTIR spectra and field emission scanning electron microscope (FESEM) images show no evidence of the surface modification. The reaction temperatures were varied from 60 to 80 °C with various reaction periods. Small absorption shoulder of the C=O stretching vibration was at 1700 cm-1, and slightly increased with the increase of the reaction time at 60 °C. The clear absorption peak appeared at 1698 cm-1 for the spheres reacted for 80 min at 70 °C and shifted toward 1720 cm-1 with the increase the reaction time. Strong absorption peak showed at 1698 cm-1 and shifted toward 1725 cm-1 with the increase of the reaction time at 80 °C. The spheres were dispersed to methanol and added photoinitiator (Irgacure-184). The solution was poured to a patterned glass substrate and exposed to the 254 nm UV-light during a self-assembly process. A large area and crack-free silica sphere film was formed. To increase the mechanical stability, a cellulose acetate solution was spin-coated to the film. The film was lift-off from the glass substrate to analyze the surface nanostructures. The surface nanostructures were maintained, and the film is stable enough to use as a mold to duplicate the nanopattern and flexible.","PeriodicalId":128143,"journal":{"name":"Optics & Photonics - NanoScience + Engineering","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-09-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132969439","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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