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Nonlinear scattering of ultrashort laser pulses on two-level system 超短激光脉冲在两能级系统中的非线性散射
Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178262
V. Astapenko, S. Sakhno
{"title":"Nonlinear scattering of ultrashort laser pulses on two-level system","authors":"V. Astapenko, S. Sakhno","doi":"10.1117/12.2178262","DOIUrl":"https://doi.org/10.1117/12.2178262","url":null,"abstract":"The presentation is devoted to the theoretical investigation of nonlinear scattering of ultrashort electromagnetic pulses (USP) on two-level quantum system. We consider the scattering of several types of USP, namely, so called corrected Gaussian pulse (CGP) and cosine wavelet pulse. Such pulses have no constant component in their spectrum in contrast with traditional Gaussian pulse. It should be noted that the presence of constant component in the limit of ultrashort pulse durations leads to unphysical results. The main purpose of the present work is the investigation of the change of pulse temporal shape after scattering as a function of initial phase at different distances from the target. Numerical calculations are based on the solution of Bloch equations and expression for scattering field strength via dipole moment of two-level system exposed by the action of incident USP. In our calculation we also account for the influence of refracting index of the air on electric field strength in the pulse after scattering.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129100399","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
Experimental mapping of nonlinear dynamics in synchronized coupled semiconductor laser networks 同步耦合半导体激光网络非线性动力学的实验映射
Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178822
A. Argyris, M. Bourmpos, D. Syvridis
{"title":"Experimental mapping of nonlinear dynamics in synchronized coupled semiconductor laser networks","authors":"A. Argyris, M. Bourmpos, D. Syvridis","doi":"10.1117/12.2178822","DOIUrl":"https://doi.org/10.1117/12.2178822","url":null,"abstract":"The potential of conventional semiconductor lasers to generate complex and chaotic dynamics at a bandwidth that extends up to tens of GHz turns them into useful components in applications oriented to sensing and security. Specifically, latest theoretical and experimental works have demonstrated the capability of mutually coupled semiconductor lasers to exhibit a joint behaviour under various conditions. In an uncoupled network consisting of N similar SLs - representing autonomous nodes in the network - each node emits an optical signal of various dynamics depending on its biasing conditions and internal properties. These nodes remain unsynchronized unless appropriate coupling and biasing conditions apply. A synchronized behaviour can be in principle observed in sub-groups of lasers or in the overall laser network. In the present work, experimental topologies that employ eight SLs, under diverse biasing and coupling conditions, are built and investigated. The deployed systems incorporate off-the-shelf fiber-optic communications components operating at the 1550nm spectral window. The role of emission wavelength detuning of each participating node in the network - at GHz level - is evaluated.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126988157","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
Coherent nonlinear optical microscopy for acquiring structural information of cell cytoskeleton 用于获取细胞骨架结构信息的相干非线性光学显微镜
Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2179028
D. Sharoukhov, H. Lim
{"title":"Coherent nonlinear optical microscopy for acquiring structural information of cell cytoskeleton","authors":"D. Sharoukhov, H. Lim","doi":"10.1117/12.2179028","DOIUrl":"https://doi.org/10.1117/12.2179028","url":null,"abstract":"Second-harmonic generation (SHG) is a coherent nonlinear optical process occurring in non-centrosymmetric molecules, including microtubule (MT). MT is a cytoskeleton playing many important roles in a variety of cellular processes depending on the cell type, and the conformation is crucial for the function. Here we present the use of SHG process to probe MT cytoskeleton in living neuronal tissue. Polarization-resolved SHG (p-SHG) imaging and the second-order tensor analysis were performed on the retinal nerve fibers in order to probe the structure of MTs in axon. The polar anisotropy of tubulins was determined at the molecular level. The effect of MT-stabilizing drug Taxol was also examined and the induced changes were not detectable by p-SHG. Our results demonstrate SHG as a novel optical method to measure conformational changes of MTs in the native cellular context. The technique could be employed in conjunction with existing atomic-resolution methods of structural biology to improve our understanding of cytoskeleton dynamics in vivo.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116355077","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
Self-pulsing in nonlinear Kerr-type coupled ring resonators with effect of loss 具有损耗效应的非线性克尔型耦合环谐振器的自脉冲
Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178798
Y. Ekşioğlu, J. Petráček
{"title":"Self-pulsing in nonlinear Kerr-type coupled ring resonators with effect of loss","authors":"Y. Ekşioğlu, J. Petráček","doi":"10.1117/12.2178798","DOIUrl":"https://doi.org/10.1117/12.2178798","url":null,"abstract":"We focus on dynamical analysis of nonlinear structures consisting of coupled ring resonators. We formulate a system of difference-differential equations that take into account non-instantaneous Kerr response and the effect of loss. The system is applied to investigation of a double-ring structure in the all-pass filter configuration. We observe rich dynamics, transitions from steady state to Hopf bifurcations and chaos. The system is highly sensitive for the values of detuning from resonance and input power. The influence of loss on oscillatory states is also presented.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125831878","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
Optical nonlinearities induced by electric fields in nematic liquid crystals 向列液晶中电场诱导的光学非线性
Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178320
V. Stoian, Cristina Cîirtoaje, E. Petrescu, C. Moţoc
{"title":"Optical nonlinearities induced by electric fields in nematic liquid crystals","authors":"V. Stoian, Cristina Cîirtoaje, E. Petrescu, C. Moţoc","doi":"10.1117/12.2178320","DOIUrl":"https://doi.org/10.1117/12.2178320","url":null,"abstract":"Nonlinear phenomena induced by an electric field inside a nematic liquid crystal were studied. A planar oriented cell filled with 5CB nematic liquid crystal was subjected to an external voltage, higher than the threshold value for the Freedericksz transition, and a laser beam was sent perpendicular to the cell. Circular fringes appeared on the screen. The maximum number of diffraction fringes for different voltage values was measured and the experimental plot were in good agreement with theory. We performed a set of dynamic measurements of the fringes evolution from the moment when the laser beam was applied until the maximum number of fringes was reached, for each voltage, and the results were consistent with theoretical pattern.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"544 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114613553","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
Selective multiphoton excitation by parametrically shaped laser pulses 参数化激光脉冲的选择性多光子激发
Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2087110
A. Lindinger
{"title":"Selective multiphoton excitation by parametrically shaped laser pulses","authors":"A. Lindinger","doi":"10.1117/12.2087110","DOIUrl":"https://doi.org/10.1117/12.2087110","url":null,"abstract":"Laser pulse shaping is reported for applications on multiphoton processes in dye molecules. Particularly phase-tailored pulse shapes are employed for two-photon excited fluorescence of dyes in a liquid environment, also at the distal end of an optical fiber, in order to improve the contrast between dye markers having similar excitation spectra. Precompensation of the optical fiber properties is utilized by analytical pulse shaping in order to receive specific parametric pulse forms after the fiber. This will lead to new endoscopic imaging applications with an increased fluorescence contrast. Moreover, selective excitation is also demonstrated for three-photon transitions of the two dyes, p-Terphenyl (PTP) and BM-Terphenyl (BMT), in solution by using shaped pulses without a fiber. A good agreement between experiment and theoretical simulation is obtained. With this approach it is possible to achieve a considerable change of the fluorescence contrast between the two dyes which is relevant for imaging applications of biological molecules.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134522611","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
Organic-inorganic planar hybrid materials for spasers 传感器用有机-无机平面杂化材料
Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178660
N. Toropov, A. Kamalieva, T. Vartanyan
{"title":"Organic-inorganic planar hybrid materials for spasers","authors":"N. Toropov, A. Kamalieva, T. Vartanyan","doi":"10.1117/12.2178660","DOIUrl":"https://doi.org/10.1117/12.2178660","url":null,"abstract":"We strive to obtain highly fluorescent planar materials that may be used for the development of nanolasers based on localized plasmons. The promissing candidates for this purpose are materials consisting of mixtures of organic molecules, polymer, and silver nanoparticles. Silver nanoparticles were preliminary deposited on the quartz substrates. These samples were characterized by SEM and absorption spectroscopy. Then, they were covered by the polymer/rhodamine and polymer/coumarin layers using either spin-coating or evaporation techniques and characterized by confocal luminescent microscopy and spectroscopy. As a result of the localized surface plasmon excitation, we observed the enhancement of the rhodamine and coumarine absorption in the near fields of silver nanoparticles. The fluorescence of the thin films of polymer activated by dyes molecules with silver nanoparticles was almost 20-fold more intense than that on the bare dielectric surfaces without silver nanoparticles. In the presence Ag nanoparticles and at increased intensities of excitation we found also slight narrowing of the luminescence spectrum of polymer/coumarin layers.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132676858","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
Waveguide and active region structure optimization for low-divergence InAs/InGaAs quantum dot comb lasers 低发散InAs/InGaAs量子点梳状激光器波导和有源区结构优化
Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178681
V. V. Korenev, A. Savelyev, A. Zhukov, M. Maximov, A. Omelchenko
{"title":"Waveguide and active region structure optimization for low-divergence InAs/InGaAs quantum dot comb lasers","authors":"V. V. Korenev, A. Savelyev, A. Zhukov, M. Maximov, A. Omelchenko","doi":"10.1117/12.2178681","DOIUrl":"https://doi.org/10.1117/12.2178681","url":null,"abstract":"Ways to improve beam divergence and energy consumption of quantum dot lasers emitting via the ground-state optical transitions by optimization of the key parameters of laser active region are discussed. It is shown that there exist an optimal cavity length, dispersion of inhomogeneous broadening and number of QD layers in active region allowing to obtain lasing spectrum of a given width at minimum injection current. The planar dielectric waveguide of the laser is optimized by analytical means for a better trade-off between high Γ-factor and low beam divergence.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"302 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131965415","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
Slow and fast light switching in ruby 慢速和快速的光开关在红宝石
Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2182363
R. Rajan, H. Riesen
{"title":"Slow and fast light switching in ruby","authors":"R. Rajan, H. Riesen","doi":"10.1117/12.2182363","DOIUrl":"https://doi.org/10.1117/12.2182363","url":null,"abstract":"Studies about light propagation have been undertaken for more than a century. It is now well established that any material that has normal or anomalous dispersion generates slow or fast light. In this paper, we demonstrate an experimental technique to rapidly switch between slow and fast light in ruby. The experiment utilizes transient holeburning to create drastic variation in refractive index of ruby to produce slow as well as fast light. Transient hole-burning involves the depletion of the ground state leading to a highly populated excited state by single frequency laser excitation. This leads to a hole in the absorption spectrum when readout by a laser. We observed a delay of 29 ns and advancement of -11 ns in an external magnetic field of B║c = 12 mT corresponding to a group velocity of c/961 and negative group velocity of –c/365 respectively.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130505037","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
The accuracy of the DDA (Discrete Dipole Approximation) method in determining the optical properties of black carbon fractal-like aggregates 离散偶极近似法测定黑碳分形聚集体光学性质的准确性
Europe Optics + Optoelectronics Pub Date : 2015-05-18 DOI: 10.1117/12.2178646
K. Skorupski
{"title":"The accuracy of the DDA (Discrete Dipole Approximation) method in determining the optical properties of black carbon fractal-like aggregates","authors":"K. Skorupski","doi":"10.1117/12.2178646","DOIUrl":"https://doi.org/10.1117/12.2178646","url":null,"abstract":"Black carbon (BC) particles are a product of incomplete combustion of carbon-based fuels. One of the possibilities of studying the optical properties of BC structures is to use the DDA (Discrete Dipole Approximation) method. The main goal of this work was to investigate its accuracy and to approximate the most reliable simulation parameters. For the light scattering simulations the ADDA code was used and for the reference program the superposition T-Matrix code by Mackowski was selected. The study was divided into three parts. First, DDA simulations for a single particle (sphere) were performed. The results proved that the meshing algorithm can significantly affect the particle shape, and therefore, the extinction diagrams. The volume correction procedure is recommended for sparse or asymmetrical meshes. In the next step large fractal-like aggregates were investigated. When sparse meshes are used, the impact of the volume correction procedure cannot be easily predicted. In some cases it can even lead to more erroneous results. Finally, the optical properties of fractal-like aggregates composed of spheres in point contact were compared to much more realistic structures made up of connected, non-spherical primary particles.","PeriodicalId":347374,"journal":{"name":"Europe Optics + Optoelectronics","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-05-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124658678","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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