bluuebunny/crossref_metadata_2025_split huggingface dataset:
Factorization of the Riesz-Feller Fractional Quantum Harmonic Oscillators
Authors: Rosu H C , Mancas S C 
Published: June 2020

Abstract
Using the Riesz-Feller fractional derivative, we apply the factorization algorithm to the fractional quantum harmonic oscillator along the lines previously proposed by Olivar-Romero and Rosas-Ortiz, extending their results. We solve the non-Hermitian fractional eigenvalue problem in the k space by introducing in that space a new class of Hermite ‘polynomials’ that we call Riesz-Feller Hermite ‘polynomials’. Using the inverse Fourier transform in Mathematica, interesting analytic results for the same eigenvalue problem in the x space are also obtained. Additionally, a more general factorization with two different Lévy indices is briefly introduced.
Is a Deterministic and Local Interpretation of Quantum Mechanics Possible?… First Steps
Authors: Nahmad-Achar E , Sánchez-Kuntz N 
Published: June 2020

Abstract
Quantum states in superposition cannot be observed, suggesting that they merely embody information on possible measurement results. Yet, we think of them as describing physical systems that evolve in time according to given mathematical equations. Furthermore, evolution takes place in physical space-time, and local causality is imposed on space-time by Special Relativity (a sequence of cause and effect that constitutes a fundamental principle by which we think about and do scientific work).
It is therefore strange that there is non–locality and violation of causality embedded in Quantum Mechanics. We try to give here a first step to see whether a deterministic and local interpretation is possible. We will show that Bell’s inequality is not conclusive about the non–local nature of Quantum Mechanics, in that there exists an interpretation of reality (which we put forward) which is local and in which Bell’s inequality cannot be derived. Assuming determinism and locality a new Bell-like inequality is derived, which is always satisfied by Quantum Mechanics and which allows for local hidden variables [1].
From Free Motion on a 3-Sphere to the Zernike System of Wavefronts Inside a Circular Pupil
Authors: Wolf K B 
Published: June 2020

Abstract
Classical or quantum systems that stem from a basic symmetry are seen to be special in having several important properties. The harmonic oscillator and the Bohr system are such. Recent research into the Zernike system provides reasons to include it in this privileged class. Here we show that free motion on the 3-sphere can be projected down to produce classical orbits or complete and orthogonal bases for wavefronts in a circular pupil. This line of inquiry has been pursued in company with N.M. Atakishiyev, G.S. Pogosyan, C. Salto-Alegre, and A. Yakhno.
Linearized Optomechanics Under Time-Dependent Phase Driving
Authors: Jaramillo Ávila B , Ventura-Velázquez C , Rodríguez-Lara B M 
Published: June 2020

Abstract
We study the effect of steepness in smooth phase changes in the laser that drives an optomechanical system in the red-detuned, linearized regime. These phase changes take the semi-classical component out of its steady state. Steeper phase changes produce larger amplitudes for the fast oscillations in the mean fields. In contrast, sufficiently slow phase changes keep the system close to its steady state and allow the implementation of a phase driving scheme designed to minimize the variation of the quantum fluctuation mean excitation values.
Nonstationary Deformed Singular Oscillator: Quantum Invariants and the Factorization Method
Authors: Zelaya K 
Published: June 2020

AbstractNew families of time-dependent potentials related with the stationary singular oscillator are introduced. This is achieved after noticing that a nonstationary quantum invariant can be constructed for the singular oscillator. Such a quantum invariant depends on coefficients related to solutions of the Ermakov equation, where the latter guarantees the regularity of the solutions at each time. In this form, after applying the factorization method to the quantum invariant rather than to the Hamiltonian, one manages to introduce the time parameter into the transformation, leading to factorized operators that become the constants of motion for the new time-dependent Hamiltonians. At the appropriate limit, the initial quantum invariant reproduces the stationary singular oscillator Hamiltonian. Some families of stationary potentials already reported by other authors are also recovered as particular cases. A striking feature of the method is that the singular barrier of the potential can be managed to vanish, which leads to non-singular time-dependent potentials.
New Families of Single—Qubit Control Fields: An Algorithm
Authors: Enríquez M , Jaimes-Nájera A 
Published: June 2020

Abstract
The dynamics of a two-level system interacting with a new class of analytically solvable driving fields is analyzed. Such fields are obtained using an inverse-engineering approach, which allows to exactly factorize the correspondent time-evolution operator via the Wei-Norman theorem. This technique is presented as an algorithm and using an example we show that the free parameters involved can be used to tune some aspects of the dynamics on demand such as the atomic population inversion.
Response of the Fractional Damped Oscillator to a Driving Delta Pulse
Authors: Olivar-Romero F 
Published: June 2020

Abstract
Exact solutions for a fractional damped oscillator that is acted by a Dirac delta pulse are reported. It is found that the response of the oscillator to such a pulse can be manipulated by either the damping parameter or the fractional order of the corresponding dynamical law.
Some Remarks on the Local Unitary Classification of Three-Qubit Pure States
Authors: Luna-Hernández S 
Published: June 2020

Abstract
Characterization of multipartite entanglement is in general a challenging task. The entanglement polytope is particularly useful to study three-qubit systems since it allows a qualitative analysis of the related non-local properties from a geometric perspective. In this work, using numerical approaches, we show that there exist a correspondence between some classes of entanglement and some specific regions of the polytope for three-qubit systems.
Quantum Entanglement in Fenna—Matthews—Olson Photosynthetic Light—Harvesting complexes: A Short Review of Analysis Methods
Authors: González-Soria B , Delgado F 
Published: June 2020

Abstract
The Fenna-Matthews-Olson light-harvesting complexes have become a center of attention due to their high excitation energy transfer efficiency, which may surpass 98%. Experimental results reveal the presence of quantum entanglement in the protein structure, which seems to be associated to such a remarkably high efficiency. Notably, Redfield and Lindblad master equations have been already used to model the chromophore excitation in the protein complex as well as its interactions with the environment. The entanglement arising during the process has been quantified through several measures. This work provides a short review of methods used to model the above described system. It is also discussed the introduction of two nonconventional measures addresed to quantify the emergent entanglement.
Truncated Radial Oscillators with a Bound State in the Continuum via Darboux Transformations
Authors: López-Mejía L , Fernández-García N 
Published: June 2020

Abstract
The radial oscillator with zero angular momentum is used to construct a short-range model by cutting-off the potential at a given radius r = b, and by substituting it with a constant potential for r > b. The new potential, called truncated radial oscillator, admits both bound and scattering states. It is shown that the appropriate Darboux transformation leads to new exactly solvable models that have the entire energy spectrum of the truncated radial oscillator plus a new discrete energy eigenvalue. The latter defines a square-integrable wave function for the new system although it is embedded in the scattering regime of the energy spectrum. The new potentials are radial and such that their asymptotic behavior coincides with the profile predicted by von Neumann and Wigner for a potential to admit an eigenvalue in the continuum.
Design and Construction of Homodyne Detectors for the Study of Quantum Optical States
Authors: Barrios-Barocio E , Velázquez V , Cruz y Cruz S 
Published: June 2020

Abstract
Nowadays the fields of Quantum Optics and Quantum Information are experiencing a mayor development worldwide, in particular, in the experimental arena. The reason relies in the high perspectives of application of these fields in areas as computing, security, telecommunications and metrology, among others. A determinant fact for the experimental and technological development is the ability to design and construct electronic devices suitable for the study of light with quantum features, as well as the software which is necessary for the analysis and processing of experimental data. In this work we present a general overview of the theory, practical design and experimental tests of one of such devices called Homodyne Detector addressed to the study and engineering of quantum states of light.
XVI National Meeting on Optics and VII Andean and Caribbean Conference on Optics and its Applications
Authors: Rueda E , Castañeda-Sepúlveda R , Sandoval-Amador A , V-Niño E D 
Published: June 2020

The XVI National Meeting on Optics and VII Andean and Caribbean Conference on Optics and its applications (XVI ENO - VII CANCOA) were successfully held together from 26th to 30th of November, 2019, at the Universidad de Cordoba, Montería, Colombia. The events brought together Colombian and Latin-American students, professionals, and researchers with interests on optics and photonics, thus offering them the opportunity to share and discuss their last research and findings, as well as to facilitate and encourage their mutual cooperation. This Proceedings issue compiles oral and poster presentations that were submitted by the authors and rigorously reviewed by a special committee designated by the Journal of Physics Conference Series (JPCS) editor for Colombian Conferences led by the Foundation of Researches in Science and Technology of Materials (FORISTOM).
In order to organize the XVI ENO - VII CANCOA according to the slogan Light and optics for the Colombian Caribbean Region, the “Red Colombiana de Óptica (RCO)” with the sponsor of the universities at the Colombian Caribbean Region. The main goal was to present the Colombian Caribbean as a region with growing interests and maturity in topics related to optics and photonics. A total of 63 oral presentations and 22 posters were presented. Four recognitions were given: two of them for undergraduate presentations and the other two for graduate presentations.
The RCO is a nonprofit society that seeks the strengthening of collaborations between researchers in optics, photonics, and spectroscopy in Colombia. It also encourages the dissemination of knowledge in optics, photonics, and spectroscopy in all areas of knowledge. More information about the network can be found on the webpage www.srco.org.co.
The National Meeting on Optics was created to facilitate the exchange of ideas between Colombian researchers on optics and photonics. The first meeting was held in 1987 in Medellín, Colombia and has been realized without interruption with two-year of periodicity.
The organizing and editorial committee of the XVI ENO - VII CANCOA hopes you enjoy the reading of this volume of the JPCS. Besides, we wish to thank all authors and participants for providing their valuable contributions for this proceeding as well as the reviewers for their constructive recommendations and criticism aiding to improve the presented articles. Likewise, we are confident that this issue will serve as a reference for optics, spectroscopy and photonics research in Colombia and Latin-America.
List of Organizing Committee, Scientific Committee, Editorial Committee, Invited Speakers, Organizing Institutions, Sponsors, Logos, Photos are available in this pdf.
Optimization of phase masks using simulated annealing algorithm for mode conversion
Authors: Gallego-Ruiz R D , Álvarez-Castaño M I , Herrera-Ramírez J A , Correa N A 
Published: June 2020

Abstract
The simulated annealing algorithm was applied for optimizing binary phase masks used in the conversion of optical modes through spatial light modulation in free space. The method changes the phase distribution to be displayed on a spatial light modulator, in such a way maximizes the correlation between de converted mode and the theoretical mode. The method allowed the optimal conversion of the linearly polarized modes through a diffractive process. The analysis of the correlations between obtained and theoretical modes showed the effectiveness of the method and its capability to generate optical modes similar to those in an optical fiber. The optimized phase masks could be applied in a dynamic and arbitrary mode converter.
Implementation of laser-induced breakdown spectroscopy technique for qualitative analysis of an austenitic steel
Authors: Toro L , Pacheco P , Álvarez J , Sarmiento R 
Published: June 2020

Abstract
In this work was used laser induced breakdown spectroscopy to study and characterize a sample of austenitic, steel American Iron and Steel Institute nomenclature, 304 series, with the objective of identifying constituent elements in the material. The steel was chosen because it is an economic and multipurpose material, which due to its physical characteristics, it is of great interest in the construction industry, design of tools and mechanical equipment. The contributions of this research to the industrial and metallurgical sector is that the laser induced breakdown spectroscopy technique allows to reduce costs in the experimental execution for qualitative studies of steels. Plasma generation was performed by focusing the radiation laser on the surface of a sample of steel. Plasma radiation generated was conducted through an optical fiber to a Mechelle spectrograph attached to an Intensified charge coupled device camera. The information obtained through the spectra allowed the characterization of the plasma by means of the parameters electronic temperature and electronic density, as well as the elementary identification of constituents of the steel sample, allowing identify major elements such as chromium, nickel, manganese and silicon, being concordant with the composition of elements present in the austenitic steel.
Surface enhanced Raman scattering of some nanotechnological material systems: A computational approach
Authors: Pérez F R , Merlano A S , Silva W , Salazar Á 
Published: June 2020

Abstract
Surface enhanced Raman spectroscopy or scattering, is an old analytical technique having multiple applications, but it still remains with great challenges. The complex physical and chemical processes involved results in difficulties for modelling and experimentation. In this work, numerical results of surface enhanced Raman spectroscopy spectra for some systems of interest in nanoscience and nanotechnology, monochlorobiphenyl isomers, graphene, magnetite and graphene oxide, are presented and discussed. A single gold nanoparticle and a dimer gold nanoparticle were utilized as surface-enhanced Raman spectroscopy substrates. The possibility of predicting structural properties of graphene oxide from comparison between its experimental and simulated Raman spectra is discussed. A relation between the enhancement factor for the G band of graphene oxide and the radius of a spherical nanoparticle dimer of gold, is suggested.
Optical and morphological properties of Au@Ag core-shell nanoparticles: Influence of different reducing agents
Authors: Merlano A S , Pérez F R , Silva W , Escobar N , Hoyos L M , Salazar A 
Published: June 2020

Abstract
Colloidal suspensions of gold coated with silver core-shell nanoparticles in poly vinyl alcohol were prepared by the seed-mediated growth approach and a comparative study of optical and morphological properties was conducted. Two types of gold seeds were considered. For the first type, a strong reducing agent (NaBH4) and for the second one, a weak reducing agent (Na3C6H5O7) were used. Four volumes of AgNO3 solution were used to obtain silver coatings with different thicknesses. In each case, morphological and optical properties were investigated by transmission electron microscopy and ultraviolet–visible spectroscopy, respectively. Also, numerical calculations of optical absorption were performed with Matlab toolbox for the simulation of metallic nanoparticles, using a boundary element method approach. This study offers practical considerations useful as a route of synthesis at room temperature of this type of nanoparticles, in such a way that a good homogeneity and reproducibility can be achieved. Results here presented show practical details useful in the synthesis of this type of nanoparticles for applications such as catalysis.
Acquisition and evaluation of depth data from humans, in robotized industrial environments
Authors: Nieto W , Arias-Correa M , Madrigal-González C 
Published: June 2020

Abstract
Industry 4.0 places great importance on collaborative robotics in industrial production and, therefore, on the safe interaction between humans and robots. In previous decades, robots that were part of flexible manufacturing systems remained isolated from human operators through physical enclosures, but current human-robot collaboration activities require a simultaneous concurrent workspace for both actors. Collaborative robotics security systems have used (among others) artificial vision systems based on red, green and blue additive color model images, as proven solutions in detecting humans within the work area of robots. In recent work, the combination of red, green, and blue additive color model imaging with depth imaging systems has demonstrated low sensitivity to lighting changes and a high positional match between distance data and color pixels in both types of acquired images. However, a detailed review resulted in the absence of databases of industrial robotic environments in this type of images. In this paper, an extensive database is delivered in the format already explained that contains people in robotic industrial settings. Furthermore, evaluating the database using machine learning techniques enables computer vision researchers to gain a better understanding of human detection using a Kinect sensor and convolutional neural networks.
A validation strategy for a target-based vision tracking system with an industrial robot
Authors: Romero C , Naufal C , Meza J , Marrugo A G 
Published: June 2020

Abstract
Computer vision tracking systems are used in many medical and industrial applications. Understanding and modeling the tracking errors for a given system aids in the correct implementation and operation for optimal measurement results. This project aims to simulate and experimentally validate a tracking system for medical imaging. In this work, we developed a validation strategy for a target-based vision tracking system with an industrial robot. The simulation results show that the system can be accurately modeled, and the error assessment strategy is robust. Experimental verification with an EPSON C3 robot shows the reliability of the vision tracking system to obtain the target position and pose accurately. The general-purpose performance assessment strategy can be used as a vision tracking evaluation mechanism to ensure the system performance is adequate for a given application.
Plasmon modes characterization in hybrid noble/ ferromagnetic nanodisks using an effective medium approximation
Authors: Herreño-Fierro C A , Zapata-Herrera M 
Published: June 2020

Abstract
Magneto-plasmonic systems composed by noble/ferromagnetic metals structures can be used to control light polarization. The extraordinary optical properties arising from combining strong local enhancements of electromagnetic fields in surface plasmon excitations with the magneto-optical activity inherent to ferromagnetic materials, can be controlled by external magnetic fields that have demonstrated the possibility to control and amplify the magneto-optical properties via plasmonic excitations. In this work, the anisotropic optical and ellipsometric sensitivity to dielectric environment of multi-layered hybrid gold/cobalt magnetoplasmonic nanodisks are studied in the framework of the effective-medium approximation, where the components of the dielectric tensor of the system are modelled using Lorentz-like oscillators. Furthermore, full electromagnetic simulations were performed using the standard Finite Element Method, which allow us to characterize the modes and explore the role of the dielectric environment of the nanodisks in the optical properties of the nanostructures via the variation of a coating silicon dioxide (SiO2) layer thickness. Our model and numerical results show a very good agreement with spectral ellipsometry measurements, where two orthogonal plasmonic modes one in-plane and one out-of-plane- are well characterized. These results lead us to conclude that the effective-medium approximation is good enough to accurately describe the plasmonic behavior of multi-layered confined nanostructures.
Automatic recognition of Colombian car license plates using convolutional neural networks and Chars74k database
Authors: Arroyo-Pérez D E , Álvarez-Canchila O I , Patiño-Saucedo A , Rostro González H , Patiño-Vanegas A 
Published: June 2020

Abstract
A methodology for the automatic recognition of Colombian car license plates using convolutional neural networks is proposed. One of the biggest challenges when using onvolutional neural network is the demand for large amounts of samples for training. In this work, we show that if we do not have enough images of vehicle license plates to carry out the training, we can complement it with databases of letters and numbers that are not extracted from cars. The network was trained with the Chars74k database and images of characters extracted from plates of Colombian automobiles. The Chars74k contains approximately 74000 images of all the letters of the Spanish alphabet and all digits from 0 to 9. From chars74k database we have chosen 33849, because the Colombian plates have only uppercase letters and digits. Only 3549 (about 10% of the total) images of characters extracted manually from plates of Colombian automobiles were added. At the input of the convolutional neural network, 70% of the images were used for training, 20% for validation and 10% for testing and the resulting validation accuracy was above 99%. By making a preliminary test on Colombian plates never before used in training, a percentage of correctly recognized plates above 98% was achieved.