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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Mezcla de color temporal y configuración dinámica del haz con metasuperficies de silicio
Aaron L Holsteen1, Ahmet Fatih Cihan2, Mark L Brongersma3
1Geballe Laboratory for Advanced Materials, Stanford University, Stanford, CA 94305-4045, USA.
Science (New York, N.Y.)
|July 20, 2019
Resumen
Los investigadores desarrollaron metasuperficies rápidas y eléctricamente sintonizables para la manipulación dinámica de la luz. Este avance permite funciones ópticas avanzadas como la dirección del haz y la mezcla de colores utilizando sistemas microelectromecánicos.
Área de la Ciencia:
- Óptica y fotónica
- Ciencias de los materiales
- Ingeniería eléctrica
Sus antecedentes:
- Las metasuperficies permiten la configuración de frentes de onda ópticas compactas, pero suelen ser estáticas.
- Los sistemas ópticos dinámicos requieren metasuperficies reconfigurables para funciones sintonizables.
- Las tecnologías existentes a menudo carecen de control de velocidad o de fase / amplitud completa.
Objetivo del estudio:
- Desarrollar metasuperficies eléctricamente reconfigurables con tiempos de respuesta rápidos.
- Para lograr un control de fase completo (0- a 2π) y una modulación de amplitud significativa.
- Para crear una plataforma para funciones ópticas dinámicas en dispositivos compactos.
Principales métodos:
- Fabricación de conjuntos de antenas de silicio utilizando la tecnología estándar de silicio sobre aislante.
- Integración de sistemas microelectromecánicos (MEMS) para píxeles sintonizables.
- Demostración del movimiento de píxeles controlado eléctricamente para la modulación óptica.
Principales resultados:
- Se obtienen píxeles de meta-superficie con velocidades de conmutación superiores a 10^5 Hz.
- Se ha demostrado un control de fase completo de 0 a 2π y una gran modulación de amplitud.
- Funcionamiento de baja tensión validado para aplicaciones ópticas dinámicas.
Conclusiones:
- La tecnología desarrollada permite metasurfaces rápidas y eléctricamente sintonizables.
- Esta plataforma admite mezcla de colores temporales, dirección dinámica del haz y enfoque de luz.
- El enfoque ofrece una solución versátil para sistemas ópticos compactos de próxima generación.
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