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Control no recíproco y enfriamiento de los modos de fonón en un sistema optomecánico
H Xu1,2, Luyao Jiang1, A A Clerk3
1Department of Physics, Yale University, New Haven, CT, USA.
Nature
|April 5, 2019
Resumen
Los investigadores desarrollaron un nuevo método para romper la reciprocidad en los resonadores mecánicos, permitiendo el flujo de energía acústica unidireccional. Esta innovación permite el aislamiento sintonizable y el control de la fluctuación térmica en los dispositivos fonónicos.
Área de la Ciencia:
- Física cuántica y acústica
- Optomecánica
- Nanotecnología
Sus antecedentes:
- Los resonadores mecánicos son cruciales para dispositivos como los detectores de ondas gravitacionales y los teléfonos inteligentes, ya que ofrecen baja disipación y acoplamiento sintonizable.
- Los sistemas actuales generalmente obedecen a la reciprocidad, lo que limita las aplicaciones que requieren una propagación de señal unidireccional.
- Los dispositivos fonónicos no recíprocos existentes carecen de características de operación robustas como una fuerte no reciprocidad, sintonizabilidad e integración compacta.
Objetivo del estudio:
- Introducir un nuevo esquema para lograr un robusto acoplamiento no recíproco entre los resonadores fonónicos.
- Demostrar un método para controlar el flujo de energía acústica en sistemas de resonancia mecánica.
- Explorar la aplicación de la no reciprocidad en la gestión de las fluctuaciones térmicas y los resonadores de refrigeración.
Principales métodos:
- Utilizando la interacción estándar cavidad-optomecánica para diseñar el acoplamiento no recíproco.
- Implementación de aislamiento sintonizable mediante el ajuste de las fases de los tonos de accionamiento aplicados a la cavidad óptica.
- Monitoreo directo de la dinámica del resonador para analizar los efectos no recíprocos en las fluctuaciones térmicas.
Principales resultados:
- Logró aproximadamente 30 decibelios de aislamiento en funcionamiento continuo.
- Se ha demostrado la compatibilidad in situ de la no reciprocidad a través de las fases de tono de accionamiento.
- Mostró el control sobre las fluctuaciones térmicas, permitiendo el enfriamiento del resonador fonónico.
Conclusiones:
- El esquema optomecánico desarrollado proporciona un acoplamiento no recíproco robusto, sintonizable y continuo para los resonadores fonónicos.
- Este avance permite la creación de dispositivos fonónicos avanzados como aisladores y circuladores con un rendimiento mejorado.
- La capacidad de controlar las fluctuaciones térmicas abre nuevas vías para el enfriamiento y la reducción del ruido en los sistemas de resonancia mecánica.
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