Influencia del espesor de la capa de una nanopartícula esférica en la tasa de emisión radiativa de un átomo cercano
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Date
2023
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Universidad Nacional de Trujillo
Abstract
Se investigó la permitividad y las frecuencias resonantes de un sistema esférico núcleo-capa en un campo homogéneo, y la tasa de emisión radiativa de un átomo situado en las cercanías del sistema esférico. Este estudio contribuye a estudios teóricos, como a las resonancias Fano, espectros de propiedades ópticas, entre otros. También contribuye con aplicaciones tecnológicas, como en óptica no lineal, metamateriales, guías de onda; en química, biología, medicina, entre otras disciplinas científicas. Para ello, se usó la teoría cuasi estática en la ecuación de Laplace de la electrostática, y luego el cálculo del factor G de la teoría de la emisión radiativa de un átomo cercano al sistema esférico núcleo-capa; cuyas ecuaciones se graficaron usando la metodología teórico-computacional, con ayuda del software: EES (Enginnering Equation Solver) y del Matlab 2007a. Las gráficas mostraron una fuerte dependencia del tipo de material de la nanocapa esférica para un factor de reducción mayor a 0,5. Además, se presentó una tasa de emisión radiativa, mayor a cuatro órdenes de magnitud, también un corrimiento hacia mayores longitudes de onda y una intensificación de esta tasa para 𝑘0𝑎1=0,05 y una espesa capa metálica (con factor de reducción cercano a 0,1).
The permittivity and resonant frequencies of a core-shell spherical system in a homogeneous field, and the radiative emission rate of an atom located in the vicinity of the spherical system were investigated. This study contributes to theoretical studies, such as Fano resonances, optical property spectra, among others. He also contributes with technological applications, such as nonlinear optics, metamaterials, waveguides; in chemistry, biology, medicine, among other scientific disciplines. For this, the quasi-static theory was used in the Laplace equation of electrostatics, and then the calculation of the G factor of the theory of radiative emission of an atom close to the nucleo-shell spherical system; whose equations were graphed using the theoretical-computational methodology, with the help of the software: EES (Enginnering Equation Solver) and Matlab 2007a. The graphs showed a strong dependence on the type of spherical nanolayer material for a reduction factor greater than 0.5. In addition, a radiative emission rate was presented, greater than four orders of magnitude, as well as a shift towards longer wavelengths and an intensification of this rate for 𝑘0 𝑎1 0 05 and a thick metallic layer (with a reduction factor close to 0.1).
The permittivity and resonant frequencies of a core-shell spherical system in a homogeneous field, and the radiative emission rate of an atom located in the vicinity of the spherical system were investigated. This study contributes to theoretical studies, such as Fano resonances, optical property spectra, among others. He also contributes with technological applications, such as nonlinear optics, metamaterials, waveguides; in chemistry, biology, medicine, among other scientific disciplines. For this, the quasi-static theory was used in the Laplace equation of electrostatics, and then the calculation of the G factor of the theory of radiative emission of an atom close to the nucleo-shell spherical system; whose equations were graphed using the theoretical-computational methodology, with the help of the software: EES (Enginnering Equation Solver) and Matlab 2007a. The graphs showed a strong dependence on the type of spherical nanolayer material for a reduction factor greater than 0.5. In addition, a radiative emission rate was presented, greater than four orders of magnitude, as well as a shift towards longer wavelengths and an intensification of this rate for 𝑘0 𝑎1 0 05 and a thick metallic layer (with a reduction factor close to 0.1).
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Keywords
Aproximación cuasi estática, Frecuencias relativas y permitividades resonantes, Tasa de emisión radiativa en núcleo-capa esférico