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Compas de frecuencia con puertas sintonizables en microrresonadores de nitruro de grafeno

Baicheng Yao1,2,3, Shu-Wei Huang4,5, Yuan Liu6,7

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Los investigadores demuestran peines de frecuencia óptica basados en grafeno eléctricamente sintonizables. Este avance permite diversas salidas de peine en una sola microcavidad, allanando el camino para la optoelectrónica avanzada y la óptica ultrarrápida.

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Área de la Ciencia:

  • Optoelectrónica y fotónica
  • Ciencias de los materiales
  • Información cuántica

Sus antecedentes:

  • Los peines de frecuencia óptica son cruciales para la metrología, la espectroscopia y la información cuántica.
  • Los peines a escala de chip ofrecen miniaturización pero carecen de ajuste de campo eléctrico para la dispersión cromática.
  • La conductividad óptica ajustable del grafeno presenta oportunidades para dispositivos optoelectrónicos.

Objetivo del estudio:

  • Para demostrar los peines de frecuencia óptica electricamente sintonizables utilizando grafeno.
  • Para integrar la conductividad ajustable del grafeno con los microrresonadores de nitruro de silicio.
  • Para lograr el control dinámico sobre la formación del peine y los estados de solitón.

Principales métodos:

  • Acoplamiento de la conductividad del grafeno sintonizable con un microrresonador fotónico de nitruro de silicio.
  • Utilizando un transistor de doble capa de ion-gel para ajustar el nivel de Fermi del grafeno (0,45-0,65 eV).
  • Preservar los altos factores de calidad de las cavidades (hasta 10^6) en el sistema de microcavidades de grafeno.

Principales resultados:

  • Líneas de peine primarias con capacidad de carga demostrada de 2,3 a 7,2 THz.
  • Logró la radiación controlada de Cherenkov y los estados de solitón dentro de una sola microcavidad.
  • Se han observado transiciones sintonizables entre cristales solitónicos periódicos y defectuosos.

Conclusiones:

  • Las microcavidades de grafeno permiten una sintonización eléctrica sin precedentes de los peines de frecuencia óptica.
  • Esta integración heterogénea hace avanzar la óptica ultrarrápida y la optoelectrónica.
  • La tecnología ofrece una plataforma versátil para la generación y el control dinámicos del peine de frecuencia.