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Límites fundamentales para los plasmónicos de grafeno

G X Ni^1,2, A S McLeod^1,2, Z Sun²

¹Department of Physics, Columbia University, New York, NY, USA.

|May 26, 2018

Resumen

Los investigadores lograron longitudes de propagación récord para los polaritones plasmónicos en grafeno a temperaturas criogénicas. Este avance en la comprensión de la disipación plasmónica allana el camino para las interacciones avanzadas de luz y materia a nanoescala.

Área de la Ciencia:

Física de la materia condensada
La nanofotónica
Ciencias de los materiales

Sus antecedentes:

Los polaritones de plasma, excitaciones híbridas de luz y electrones, ofrecen confinamiento de energía a nanoescala para efectos cuánticos.
Lograr largas vidas plasmónicas es crucial pero desafiante para los modos confinados.
Los polaritones plasmónicos de grafeno son prometedores para las interacciones luz-materia a nanoescala, pero sufren una disipación significativa.

Objetivo del estudio:

Investigar los límites fundamentales de la disipación plasmónica en el grafeno.
Explorar las características de propagación de los polaritones plasmónicos en grafeno de alta calidad a temperaturas criogénicas.
Identificar los mecanismos de pérdida dominantes que afectan a la propagación de los polaritones plasmónicos.

Principales métodos:

Utilizó imágenes infrarrojas a escala nanométrica.
Estudió la propagación de polaritones plasmónicos en grafeno encapsulado de alta movilidad.
Realizó experimentos a temperaturas criogénicas.

Principales resultados:

Las pérdidas dieléctricas identificadas de las capas encapsuladas como la principal restricción a la propagación de polaritones plasmónicos.
Se observó una pequeña contribución de las interacciones electrón-fonón a la disipación.
Se han logrado longitudes de propagación plasmónica intrínsecas superiores a 10 micrómetros (50 longitudes de onda) a temperaturas de nitrógeno líquido, un récord para los modos confinados.

Conclusiones:

La disipación plasmónica en el grafeno se rige principalmente por las pérdidas dieléctricas, no por las interacciones electrón-fonón, en condiciones específicas.
El estudio establece un nuevo punto de referencia para la longitud de propagación plasmónica en sistemas de grafeno confinados.
Los hallazgos proporcionan información crucial para mitigar las pérdidas plasmónicas y avanzar en la ingeniería de la heteroestructura para aplicaciones nanofotónicas.

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