Publication: Control de la velocidad de la luz en películas nanométricas de agregados moleculares
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2015-09
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Abstract
En este Trabajo Fin de Master estudiamos el comportamiento de un pulso óptico en el seno de una película nanométrica de agregados moleculares. Generalizando trabajos anteriores hemos considerado la creación y aniquilación de dos excitones a través de un modelo de cuatro niveles energéticos. Nuestras simulaciones numéricas muestran que la dinámica de dos excitones juega un papel relevante, y da lugar a grandes retardos en la propagación del pulso luminoso en comparación con otros sistemas no nanométricos. Es más, la distorsión del pulso y la ganancia de la señal permanecen dentro de límites muy prometedores para su aplicación en telecomunicaciones. Nuestro trabajo se centra en analizar qué conjunto de parámetros del sistema proporciona una respuesta óptima en aplicaciones de luz lenta, así como en el estudio de los efectos del desorden. Nuestra conclusión es que los procesos de luz lenta son un fenómeno robusto en estos sistemas, incluso en presencia de una dinámica excitónica compleja.
In this Master Thesis we study the behavior of an optical pulse within a nanometric film of linear molecular aggregates. Generalizing previous reports we have considered the formation and annihilation of two excitons by means of a four-level model. Our numerical simulations show that the two-exciton dynamics plays a significant role and still supports remarkable fractional delays of the pulses in comparison with other non-nanometric systems. More importantly the pulse distortion and the signal gain remain within relevant limits far technological applications. Our work is focused on analyzing the best set of parameters that give rise to an optimal response, as well as the effects of disorder on the performance of the system. We conclude that slow light processes are a robust phenomenon in these systems when the complexity of the excitan dynamics is increased.
In this Master Thesis we study the behavior of an optical pulse within a nanometric film of linear molecular aggregates. Generalizing previous reports we have considered the formation and annihilation of two excitons by means of a four-level model. Our numerical simulations show that the two-exciton dynamics plays a significant role and still supports remarkable fractional delays of the pulses in comparison with other non-nanometric systems. More importantly the pulse distortion and the signal gain remain within relevant limits far technological applications. Our work is focused on analyzing the best set of parameters that give rise to an optimal response, as well as the effects of disorder on the performance of the system. We conclude that slow light processes are a robust phenomenon in these systems when the complexity of the excitan dynamics is increased.
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Master en Nanofísica y Materiales Avanzados. Facultad de Ciencias Físicas. Curso 2014-2015
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