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A novel and stretchable carbon-nanotube/ni@TiO_(2):W photocatalytic composite for the complete removal of diclofenac drug from the drinking water

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Journal of environmental Sciences 2023年第4期126卷 575-589页

作者： Ernesto Valadez-Renteria Rafael Perez-Gonzalez Christian Gomez-Solis Luis Armando Diaz-Torres Armando encinas Jorge Oliva Vicente Rodriguez-Gonzalez Consejo nacional de Ciencia y Tecnología-División de Materiales Avanzados Instituto Potosino de Investigación Científica y TecnológicaSan Luis Potosí78216México División de Ciencias e Ingenierías Universidad de GuanajuatoLeón 37150México Grupo de Espectroscopia de Materiales Avanzados y nanoestructurados(GEMAnA) Centro de Investigaciones enópticaA.C.Lomas Del CampestreLeón 37150México

We present the structural,morphological and photocatalytic properties of stretchable composites made with carbon nanotubes (CnTs),silicon rubber and ni@TiO_(2):W nanoparticles(TiWni nPs) with average size of 37±2 *** images showed that the TiWni nPs decorated the surface of the CnT fibers,which are oriented in a preferential *** nPs presented a mixture of anatase/rutile phases with cubic *** performance of the TiWni powders and stretchable composites was evaluated for the photocatalytic degradation of diclofenac (DCF) anti-inflammatory drug under ultraviolet-visible *** results revealed that the maximum DCF degradation percentages were 34.6%,91.9%,97.1%,98.5%and 100%for the CnT composite (stretched at 0%),TiWni powders,CnT+TiWni(stretched at 0%),CnT+TiWni (stretched at 50%) and CnT+TiWni (stretched at 100%),***,stretching the CnT+TiWni composites was a good strategy to enhance the DCF degradation percentage from 97.1%to 100%,since stretching created additional defects (oxygen vacancies) that acted as electron sink,delaying the electron-hole recombination,and favors the DCF ***/absorbance measurements confirmed the presence of such ***,the reactive oxygen species (ROS) were determined by the scavenger’s experiments and found that the main ROS were the·OH and O_(2)-radicals,which attacked the DCF molecules,causing their *** results of this investigation confirmed that the stretchable CnT/TiWni-based composites are a viable alternative to remove pharmaceutical contaminants from water and can be manually separated from the decontaminated water,which is unviable using photocatalytic powders.

关键词： Diclofenac Pharmaceutical contaminant TiO_(2) Carbon nanotubes Stretchable composite Photocatalysis

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Amyotrophic lateral sclerosis,a neurodegenerative motor neuron disease with retinal involvement

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neural Regeneration Research 2022年第5期17卷 1011-1012页

作者： Ana I.Ramírez Rosa de Hoz Pilar Rojas Juan J.Salazar instituto de investigaciones Oftalmológicas Ramón Castroviejo.Universidad Complutense de Madrid MadridSpain Facultad deÓptica y Optometría.departamento de Inmunología Oftalmología y ORL.Universidad Complutense de MadridMadridSpain Hospital General Universitario Gregorio Marañón Instituto Oftálmico de MadridMadridSpain

Amyotrophic lateral sclerosis(ALS)is a neurodegenerative disease that damages the motor neurons,the spinal cord,the cerebellum,and some areas of the ***,more recent studies show that it can also affect the visual syst... 详细信息

关键词： visual problems involvement

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Fiber laser with simultaneous multi-wavelength Er/Yb passively Q-switched and single-wavelength Tm gain-switched operations

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Photonics Research 2019年第6期7卷 608-614页

作者： J.ALAnIZ-BAYLOn M.DURAn-SAnCHEZ R.I.ALVAREZ-TAMAYO B.POSADA-RAMIREZ M.BELLO-JIMenEZ B.IBARRA-ESCAMILLA A.A.CASTILLO-GUZMAn E.A.KUZIn instituto nacional de Astrofísica óptica y Electrónica (INAOE)L. E. Erro 1 Sta. Ma. Tonantzintla Pue. 72824 Mexico COnACyT-instituto nacional de Astrofísica óptica y ElectrónicaA. P. 51 y 216 Pue. 72000 Mexico COnACyT-Universidad Autónoma de nuevo León Av.Universidad S/NSan Nicolas de los Garza N. L. 66451 Mexico instituto de investigación en comunicación óptica Universidad Autónoma de San Luis Potosí Av. Karakorum 1470 S. L. P. 78210 Mexico Universidad Autónoma de nuevo León Av.Universidad S/NSan Nicolas de los Garza N. L. 66451 Mexico

We report the experimental investigation of an all-fiber multi-wavelength passively Q-switched Er/Yb laser with simultaneous gain-switched pulsed operation by using a thulium-doped fiber as a saturable *** emission is obtained in three wavelength regions with central peaks at around 1546 nm, 1561 nm, and1862 nm. Multi-wavelength emission with separation of approximately 1 nm is obtained around the wavelength regions of 1546 nm and 1561 nm. Stable laser pulses are generated in the pump power range from 3.6 W to7.3 W.

关键词： Fiber laser multi-wavelength

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Spectral analysis of short-wavelength emission by up-conversion in a Tm3+:ZBLAn dual-diode-pumped optical fiber

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Chinese Optics Letters 2020年第7期18卷 77-81页

作者： M.Juárez-Hernández E.B.Mejía Centro de investigaciones enÓptica A.C.37150 GuanajuatoMéxico División de Ciencias e Ingenierías Universidad de Guanajuato37150 GuanajuatoMéxico

The fluorescence evolution along Tm3+-doped Zr F4–Ba F2–La F3–Al F3–na F(ZBLAn) optical fibers, as well as amplified spontaneous emission in the UV-IR region with emphasis on 350 nm, 365 nm, and 450 nm, is studied,estimating optimal fiber lengths for amplification within the region. The fibers were diode-pumped with single and double lines(687 and/or 645 nm). Double-line pumping presents a quite superior efficiency for producing UV-blue signals with the benefit of requiring very short fibers, around 20 cm, compared to single-line pumping requiring more than 50 cm. A virtual cycle in which the pumps enhance each other’s absorption is the key to these systems.

关键词： nonlinear optics fiber up-conversion fluorescence and luminescence

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Optical properties of phosphate glasses co-doped with Yb^(3+) and silver nanoparticles

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Chinese Physics B 2014年第12期23卷 249-253页

作者： M.A.Vallejo H. M.A.Martinez G. A.V.Kiryanov J.L.Lucio M. Centro de investigaciones enóptica Loma del Bosque 115 Col.Lomas del CampestreLeón 37150 Guanajuato Mxico División de Ciencias e Ingenierías del Campus León de la Universidad de Guanajuato Loma del Bosque 103Col.Lomas del Campestre37150León Guanajuato Mxico

We report the fabrication and spectroscopic characterization of Yb^3＋-doped phosphate glass, also containing silver nitrate. Scanning electron microscopy（SEM） provides the evidence of the formation of silver nano-particles（SnPs）, which are formed as a consequence of melting and thermal decomposition of Ag nO3. Absorption spectra of the samples in the visible-to-near-infrared spectral range reveal the presence of bands centered at 410 nm associated with the SnP-plasmon resonance, and at 976 nm due to the Yb^3＋. Under 916-nm laser-diode pumping, the effect of the SnP reflects that： i） the fluorescence in the 950-nm–1150-nm spectral range is strongly enhanced（～ 30 times）, while the fluorescence decay time associated with the ^2F5/2→^2F7/2transition of Yb^3＋ increases 25%, and ii） the basic lasing properties（saturation pumping intensity, the emission and absorption cross sections） are substantially improved.

关键词： rare earths phosphate glasses silver nanoparticles

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Free-space local nonseparability dynamics of vector modes

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Photonics Research 2021年第4期9卷 439-445页

作者： Xiao-Bo Hu Benjamin Perez-Garcia Valeria Rodríguez-Fajardo Raul I.Hernandez-Aranda Andrew Forbes Carmelo Rosales-Guzmán Wang Da-Heng Collaborative Innovation Center Heilongjiang Provincial Key Laboratory of Quantum Manipulation and ControlHarbin University of Science and TechnologyHarbin 150080China Photonics and Mathematical Optics Group Tecnologico de MonterreyMonterrey 64849Mexico School of Physics University of the WitwatersrandJohannesburg 2050South Africa Centro de investigaciones enÓptica A.C.Loma del Bosque 115Colonia Lomas del campestre37150 LeónGto.Mexico

One of the most prominent features of quantum entanglement is its invariability under local unitary transformations,which implies that the degree of entanglement or nonseparability remains constant during free-space propagation,true for both quantum and classically entangled *** we demonstrate an exception to this rule using a carefully engineered vectorial light field,and we study its nonseparability dynamics upon free-space *** show that the local nonseparability between the spatial and polarization degrees of freedom dramatically decays to zero while preserving the purity of the state and hence the global *** show this by numerical simulations and corroborate it *** results evince novel properties of classically entangled modes and point to the need for new measures of nonseparability for such vectorial fields,while paving the way for novel applications for customized structured light.

关键词： local dynamics quantum

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Optical trapping with structured light: a review

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Advanced Photonics 2021年第3期3卷 4-43页

作者： Yuanjie Yang Yu-Xuan Ren Mingzhou Chen Yoshihiko Arita Carmelo Rosales-Guzmán University of Electronic Science and Technology of China School of PhysicsChengduChina University of Hong Kong Department of Electrical and Electronic EngineeringHong Kong SARChina University of St Andrews SUPASchool of Physics and AstronomySt AndrewsUnited Kingdom Chiba University Molecular Chirality Research CenterChibaJapan Centro de investigaciones enÓptica A.C.LeónGuanajuatoMexico Harbin University of Science and Technology Wang Da-Heng Collaborative Innovation Center for Quantum Manipulation and ControlHarbinChina

Optical trapping describes the interaction between light and matter to manipulate micro-objects through momentum *** the case of 3D trapping with a single beam,this is termed optical *** tweezers are a powerful and noninvasive tool for manipulating small objects,and have become indispensable in many fields,including physics,biology,soft condensed matter,among *** the early days,optical trapping was typically accomplished with a single Gaussian *** recent years,we have witnessed rapid progress in the use of structured light beams with customized phase,amplitude,and polarization in optical *** beam properties,such as phase singularities on-axis and propagation invariant nature,have opened up novel capabilities to the study of micromanipulation in liquid,air,and *** summarize the recent advances in the field of optical trapping using structured light beams.

关键词： optical trapping structured beams vortex beam optical angular momentum.

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numerical Study of Highly nonlinear Photonic Crystal Fiber with Tunable Zero Dispersion Wavelengths

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Journal of Electromagnetic Analysis and Applications 2015年第5期7卷 141-151页

作者： Alejandro Barrientos García Igor A. Sukhoivanov José Amparo Andrade Lucio Oscar Gerardo Ibarra Manzano Igor Guryev Juan Carlos Hernández García Gabriel Ramos Ortiz department of Electronics engineering Universidad de Guanajuato Salamanca Mexico department of Multidisciplinary Studies Universidad de Guanajuato Yuriria Mexico COnACYT Cátedras CONACYT Ciudad de Mexico Mexico Centro de investigaciones en óptica A. C. GPOM León Mexico

Solid-core silica photonic crystal fiber is proposed borrowing the concept of golden ratio (1.618) and keeping it between pitch and air hole diameter Λ/d in a subset of six rings of air-holes with hexagonal arrangement. In the case when we have a pitch equal to one micron (Λ = 1 μm), we need air-holes diameters d = 0.618 μm in order to achieve two zero dispersion wavelength (ZDW) points at 725 nm and 1055 nm;this gives us the possibility to use the fiber for supercontinuum generation, by pumping close to that points, pulse compression or reshaping. We analyzed a series of fibers using this relation and showed the possibilities of tunable ZDW in a wide range of wavelengths from 725 nm to 2000 nm, with low losses and small effective area. In agreement with the ZDW point needed, the geometry of the structure can be modified to the point of having only three rings of air holes that surround the solid core with low losses and good confinement mode. The design proposed here is analyzed using the finite element method with perfectly matched layers, including the material dispersion directly into the model applying the Sellmeier’s equation.

关键词： Photonic Crystal Fibers Supercontinuum Generation Zero Dispersion Wavelength

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Symmetry in optics and photonics:a group theory approach

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Science Bulletin 2018年第4期63卷 244-251页

作者： B.M.Rodriguez-Lara Ramy EI-Ganainy Julio Guerrero Tecnologico de Monterrey.Escuela de Ingenieria y Ciencias Monterrey 64849Mexico instituto nacional de Astrofisica Optica y Electr6nicaPueblaCP 72840Mexico department of Physics and Hexes Center for Quantum Phenomena Michigan Technological UniversityHoughton.MI 49931USA departamento de Matematicas Facultad de Ciendas Experimentales y de la SaludCampus Las LagunillasUniversidad de Jaen23071JaenSpain departamento de Ingenierfa y Tecnologia de Computadores Facultad de lnformdticaCampus EspinardoUnivesidad de Murcia30100 MurciaSpain

Group theory(GT) provides a rigorous framework for studying symmetries in various disciplines in physics ranging from quantum field theories and the standard model to fluid mechanics and chaos theory. To date, the application of such a powerful tool in optical physics remains limited. Over the past few years however, several quantum-inspired symmetry principles(such as parity-time invariance and supersymmetry) have been introduced in optics and photonics for the first time. despite the intense activities in these new research directions, only few works utilized the power of group theory. Motivated by this status quo, here we present a brief overview of the application of GT in optics, deliberately choosing examples that illustrate the power of this tool in both continuous and discrete setups. We hope that this review will stimulate further research that exploits the full potential of GT for investigating various symmetry paradigms in optics, eventually leading to new photonic devices.

关键词：对称原则光学调查混乱理论液体力学标准模型光物理工具时间

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