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1دورية أكاديمية
المؤلفون: Franca, O. J., Urrutia, Luis Fernando
المصدر: Revista Mexicana de Física; Vol. 68 No. 6 Nov-Dec (2022): Revista Mexicana de Física; 060701 1–27 ; Revista Mexicana de Física; Vol. 68 Núm. 6 Nov-Dec (2022): Revista Mexicana de Física; 060701 1–27 ; 2683-2224 ; 0035-001X
مصطلحات موضوعية: Magnetoelectric effect, dipole radiation, electromagnetic wave propagation
الوصف: We consider two semi-infinite magnetoelectric media with constant dielectric permittivity separated by a planar interface, whose electromagnetic response is described by non-dynamical axion electrodynamics and investigate the radiation of a point-like electric dipole located perpendicularly to the interface. We start from the exact Green's function for the electromagnetic potential, whose far-field approximation is obtained using a modified steepest descent approximation. We compute the angular distribution of the radiation and the total radiated power finding different interference patterns, depending on the relative position dipole-observer, and polarization mixing effects which are all absent in the standard dipole radiation. They are a manifestation of the magnetoelectric effect induced by axion electrodynamics. We illustrate our findings with some numerical estimations employing realistic media as well as some hypothetical choices in order to illuminate the effects of the magnetoelectric coupling which is usually very small. ; Consideramos dos medios magnetoeléctricos semi-infinitos con permitividad dieléctrica constante separados por una interfaz plana, cuya respuesta electromagnética está descrita por la electrodinámca axiónica no dinámica. Se investiga la radiación de un dipolo eléctrico puntual ubicado perpendicularmente a la interfaz. Partimos de la función de Green exacta para el potencial electromagnético, cuya aproximación en la zona de radiación se obtiene utilizando una modificación del método del punto de silla. Se calcula la distribución angular de la radiación y la potencia radiada total encontrando diferentes patrones de interferencia, dependiendo de la posición relativa dipolo-observador, y efectos de mezcla de polarización que están ausentes en la radiación dipolar estándar. Estos nuevos efectos son una manifestación del efecto magnetoeléctrico inducido por la electrodinámica axiónica. Ilustramos nuestros resultados con algunas estimaciones numéricas empleando medios realistas, así como ...
وصف الملف: application/pdf
العلاقة: https://rmf.smf.mx/ojs/index.php/rmf/article/view/6201/6608Test; https://rmf.smf.mx/ojs/index.php/rmf/article/view/6201Test
الإتاحة: https://doi.org/10.31349/RevMexFis.68.060701Test
https://rmf.smf.mx/ojs/index.php/rmf/article/view/6201Test -
2دورية أكاديمية
المؤلفون: Körpınar, T., Demirkol, R. Cem, Körpınar, Z., Asil, V.
المصدر: Revista Mexicana de Física; Vol. 66 No. 4 Jul-Aug (2020): Revista Mexicana de Física; 431-439 ; Revista Mexicana de Física; Vol. 66 Núm. 4 Jul-Aug (2020): Revista Mexicana de Física; 431-439 ; 2683-2224 ; 0035-001X
مصطلحات موضوعية: Maxwell's equations, wave propagation, optical fiber, evolution equation, traveling wave hypothesis
الوصف: We firstly discuss the geometric phase rotation for an electromagnetic wave traveling along the optical fiber in Minkowski space. We define two types of novel geometric phases associated with the evolution of the polarization vectors in the normal and binormal directions along the optical fiber by identifying the normal-Rytov parallel transportation law and binormal-Rytov parallel transportation law and derive their relationships with the new types of Fermi-Walker transportation law in Minkowski space. Then we describe a novel approach of solving Maxwell's equations in terms of electromagnetic field vectors and geometric quantities associated with the curved path characterizing the path uniform optical fiber by using the traveling wave transformation method. Finally, we investigate that electromagnetic wave propagation along the uniform optical fiber admits an interesting family of Maxwellian evolution equation having numerous physical and geometric applications for anholonomic coordinate system in Minkowski space
وصف الملف: application/pdf; application/x-rar
العلاقة: https://rmf.smf.mx/ojs/index.php/rmf/article/view/Vol.%2066,%20issue%204,%20pp.%20431-439/4848Test; https://rmf.smf.mx/ojs/index.php/rmf/article/view/Vol.%2066,%20issue%204,%20pp.%20431-439/5419Test; https://rmf.smf.mx/ojs/index.php/rmf/article/view/Vol.%2066,%20issue%204,%20pp.%20431-439Test
الإتاحة: https://doi.org/10.31349/RevMexFis.66.431Test
https://rmf.smf.mx/ojs/index.php/rmf/article/view/Vol.%2066,%20issue%204,%20pp.%20431-439Test -
3دورية أكاديمية
المؤلفون: Körpınar, T., Demirkol, R. Cem, Körpınar, Z., Asil, V.
المصدر: Revista Mexicana de Física; Vol 66, No 4 Jul-Aug (2020): Revista Mexicana de Física; 431-439 ; 2683-2224 ; 0035-001X
مصطلحات موضوعية: Maxwell's equations, wave propagation, optical fiber, evolution equation, traveling wave hypothesis
الوصف: We firstly discuss the geometric phase rotation for an electromagnetic wave traveling along the optical fiber in Minkowski space. We define two types of novel geometric phases associated with the evolution of the polarization vectors in the normal and binormal directions along the optical fiber by identifying the normal-Rytov parallel transportation law and binormal-Rytov parallel transportation law and derive their relationships with the new types of Fermi-Walker transportation law in Minkowski space. Then we describe a novel approach of solving Maxwell's equations in terms of electromagnetic field vectors and geometric quantities associated with the curved path characterizing the path uniform optical fiber by using the traveling wave transformation method. Finally, we investigate that electromagnetic wave propagation along the uniform optical fiber admits an interesting family of Maxwellian evolution equation having numerous physical and geometric applications for anholonomic coordinate system in Minkowski space
وصف الملف: application/pdf
العلاقة: https://rmf.smf.mx/ojs/rmf/article/view/Vol.%2066,%20issue%204,%20pp.%20431-439/4848Test; https://rmf.smf.mx/ojs/rmf/article/downloadSuppFile/Vol.%2066,%20issue%204,%20pp.%20431-439/825Test; https://rmf.smf.mx/ojs/rmf/article/view/Vol.%2066,%20issue%204,%20pp.%20431-439Test
الإتاحة: https://doi.org/10.31349/RevMexFis.66.431Test
https://rmf.smf.mx/ojs/rmf/article/view/Vol.%2066,%20issue%204,%20pp.%20431-439Test -
4دورية أكاديمية
المؤلفون: Gómez-Correa, J.E., Balderas-Mata, S.E., Garza-Rivera, A., Jaimes-Nájera, A., Trevino, J. P., Coello, V., Chávez-Cerda, and S.
المساهمون: Consejo Nacional de Ciencia y Tecnología (CONACYT) (235164).
المصدر: Revista Mexicana de Física E; Vol 65, No 2 Jul-Dec (2019): Revista Mexicana de Física E; 218-222 ; Revista Mexicana de Física; Vol 65, No 2 Jul-Dec (2019): Revista Mexicana de Física E; 218-222 ; 2683-2216 ; 1870-3542
مصطلحات موضوعية: Keywords: Waveguides, odd modes, wave propagation
الوصف: In this paper we present a detailed physical analysis of the formation of the propagation transverse modes in planar dielectric waveguides using a mathematical-physics approach. We demonstrate physically that, at the wavelength scale, the pure stationary mode inside planar waveguide is described by the cosine function. Meanwhile, the sine function yields a quasi-stationary periodic mode.
وصف الملف: application/pdf
العلاقة: https://rmf.smf.mx/ojs/rmf-e/article/view/4387/4342Test; https://rmf.smf.mx/ojs/rmf-e/article/downloadSuppFile/4387/540Test; https://rmf.smf.mx/ojs/rmf-e/article/view/4387Test
الإتاحة: https://doi.org/10.31349/RevMexFisE.65.218Test
https://rmf.smf.mx/ojs/rmf-e/article/view/4387Test -
5دورية أكاديمية
المصدر: Revista Mexicana de Física; Vol 63, No 1 Jan-Feb (2017): Revista Mexicana de Física; 89-0 ; 2683-2224 ; 0035-001X
مصطلحات موضوعية: Wave propagation in random media, propagation, transmission, attenuation, radiative transfer
الوصف: A short pulse transmitted by a turbid medium is both distorted in shape and shifted temporally as its passes through. If the incident pulse is short enough an analytical expression of the deformed pulse can be calculated using the diffusion approximation of the radiative transport equation (RTE), and the optical properties of the medium can be recovered from the transmitted pulse. In this work, the effect of a homogeneous turbid medium on the transmitted temporal profile of nanosecond laser pulses was studied both experimentally and numerically for samples with different optical properties and various laser pulse widths. The numerical results showed a dependence of the pulse distortion on the variables tested, finding that this dependence dramatically changes upon varying pulse width. This work contributes to the field by showing that the interaction between turbid media phantoms and nanosecond laser pulses can also be analyzed, as it is the case for ultrashort laser pulses, by using the diffusion approximation of the RTE in certain regimes. This finding is significant and useful for applications when a laser pulse must attain to certain duration and shape after propagation through a turbid medium or when at a certain time an intensity threshold is required.
وصف الملف: application/pdf
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6دورية أكاديمية
المؤلفون: Calderón-Ramón, C., Gómez-Aguilar, J.F., Escalante-Martínez, J.E., Laguna-Camacho, J.R., Cruz-Orduña, M.I., Morales-Mendoza, L.J., López-Calderón, J.E., Hernández-Romero, I.
المصدر: Revista Mexicana de Física E; Vol 62, No 2 Jul-Dec (2016): Revista Mexicana de Física E; 108-116 ; Revista Mexicana de Física; Vol 62, No 2 Jul-Dec (2016): Revista Mexicana de Física E; 108-116 ; 2683-2216 ; 1870-3542
مصطلحات موضوعية: Fiber optics, electromagnetic wave propagation, reflection, refraction, finite difference methods
الوصف: In this paper the computational simulation of electromagnetic propagation multimodal inside an optical fiber with step index is performed. A sinusoidal source placed at the left end feeds an electromagnetic field to the optical fiber; fiber layers are modeled staggered to achieve total internal reflection of the incident light according to the wave theory of light. The simulation is performed using tools of computational electromagnetics such as Method Finite Difference Time Domain (FDTD) and the method of perfectly matched layers (PML) as boundary condition absorption to prevent electromagnetic propagation continue to infinity. The operating frequency is 187 THz used and the wavelength of 1600nm is, this simulation is achieved by developing a computational algorithm in Matlab. electromagnetic parameters propagated in the core of the optical fiber such as magnetic field components $Hx$ and $Hy$ and $Ez$ electric field are obtained. We want students to achieve understanding of the behavior of light as an electromagnetic wave inside the optical fiber, it may be something that might be perceived as simple, however, we are sure to see the electromagnetic propagation according to the results allowing clearly interpret these optical phenomena.
وصف الملف: application/pdf
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7دورية أكاديمية
المؤلفون: Macías-Díaz, J.E.
المصدر: Revista Mexicana de Física; Vol 58, No 1 (2012): Revista Mexicana de Física.; 29-40 ; 2683-2224 ; 0035-001X
مصطلحات موضوعية: Double sine-Gordon equation, computer simulation, nonlinear bistability, wave propagation, signal transmission
الوصف: In this work, we employ a numerical method to approximate the solutions of a damped, double sine-Gordon equation spatially defined over a closed and bounded interval of the real line, subject to a harmonic perturbation of the Dirichlet type on one end, and a homogeneous Neumann condition on the other. The method has schemes to approximate consistently the temporal dynamics of the local energy density and the total energy of the medium, and the total energy over any finite interval of time and, additionally, it preserves the positivity of the corresponding energy operators. As an application of this method, we establish numerically that the phenomenon of nonlinear bistability (which is physically characterized by the coexistence of conducting and insulating regimes) is present in media governed by damped, double sine-Gordon equations when the systems are driven harmonically at a frequency in the forbidden band-gap. We employ this nonlinear process in order to accurately propagate localized pulses from the perturbed end to the free boundary. Two different methods for the transmission of monochromatic waves are employed in this study, and our results demonstrate that an efficient propagation of information is feasible, indeed.
وصف الملف: application/pdf
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8دورية أكاديمية
المؤلفون: Yépez-Martínez, H., Porta, A., Yépez, E.
المصدر: Revista Mexicana de Física E; Vol 54, No 2 Jul-Dec (2008): Revista Mexicana de Física E; 168-0 ; Revista Mexicana de Física; Vol 54, No 2 Jul-Dec (2008): Revista Mexicana de Física E; 168-0 ; 2683-2216 ; 1870-3542
مصطلحات موضوعية: Inhomogeneous media, perturbation theory, wave propagation
الوصف: The exact solution of the inhomogeneous wave equation in one dimension, when the square of the velocity is a linear function of the position, can be written in terms of Bessel functions of the first kind. We use this solution as the zero order approximation for a perturbation expansion and apply it to the case when the square of the velocity can be written as a polynomial in the position. The first and second order perturbation terms, corresponding to quadratic and cubic terms for the square of the velocity, are obtained. A closed formula for the $n$-order correction in terms of integrals of the Bessel functions of the first kind was also explicitly obtained, this expression can be solved analytically for the first and second order corrections and numerically for higher terms.
وصف الملف: application/pdf
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9دورية أكاديمية
المصدر: Revista Mexicana de Física; Vol 50, No 3 (2004): Revista Mexicana de Física.; 225-0 ; 2683-2224 ; 0035-001X
مصطلحات موضوعية: Electromagnetism, wave propagation, ultrashort light pulses
الوصف: In this work is studied the transmission of linearly polarized optical pulses, which arrive from vacuum into a material medium at arbitrary angle of incidence. The considered geometry take into account that the electric field has parallel and perpendicular components to the plane of incidence. Analitical expressions are obtained for electrical and magnetic fields inside the material medium, the functional form of the expressions allow to relate the imaginary and real parts of the wave vector with the loss of the pulse spectral amplitud and with its propagation direction, respectively. It is found a generalized integral relation for the Poynting vector, in the time domain, which is valid for dispersive and absorbent media.
وصف الملف: application/pdf
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10دورية أكاديمية
المصدر: Revista Mexicana de Física; Vol 48, No 6 (2002): Revista Mexicana de Física.; 565-0 ; 2683-2224 ; 0035-001X
مصطلحات موضوعية: Wave propagation, Fourier optics, space phase measurements
الوصف: The paraxial regime of scalar wave optics has the same structure as non-relativistic quantum mechanics, with wavelength taking the place of the Planck constant. The Wigner function is a central tool to explore the phase space of a system; in optics, moreover, it can be produced by purely optical means. In this first part, we present a matrix-based formalism for the study of paraxial optical systems, and apply it to the description of a setup that, as will be seen in the second part, produces the Wigner function.
وصف الملف: application/pdf
