Dependencia de la función dieléctrica de películas nanométricas de Au con el espesor
Luis J. Mendoza Herrera, Daniel C. Schinca, Lucía B. Scaffardi, Myrian C. Tebaldi
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Información básica
Volumen
V57 - N1 / 2024 Especial: RIAO OPTILAS 2023
Referencia
51164
DOI
http://dx.doi.org/10.7149/OPA.57.1.51164
Idioma
Spanish
Etiquetas
Función dieléctrica, Au, Película nanométrica, Drude
Resumen
A escala nanométrica los materiales metálicos (nanopartículas, nanohilos y películas delgadas) juegan un rol relevante en diferentes aplicaciones. Las aplicaciones se basan en las propiedades ópticas a la nanoescala, que dependen del conocimiento de las propiedades de la función dieléctrica con el tama˜no. En este trabajo, se determina una expresión analítica para la función dieléctrica en función de la frecuencia y el espesor de películas nanométricas de Au, considerando las contribuciones de electrones libres y ligados. Para la contribución de los electrones libres se utilizó el modelo de Drude, que permitió determinar los parámetros de Drude dependientes del espesor de la película. En cuanto a la contribución de los electrones ligados, su contribución para longitudes de onda cortas es la misma para todos los espesores analizados y puede establecerse igual a la contribución del volumen. Finalmente la función dieléctrica se reescribe analíticamente, en términos de la función dieléctrica de volumen más dos términos correctivos dependientes del espesor de la película
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