Acoustic Graphene Plasmon Platform For Optoelectronics

Researchers demonstrated direct near-field optical imaging of acoustic graphene plasmon (AGP) fields, using a sensitive scattering-type scanning near-field optical microscope (s-SNOM) to directly measure the optical fields of the AGP waves propagating in a nanometer-thin waveguide. The method enabled the scientists to visualize the thousandfold compression of mid-infrared light.

The strategy paves the way for potential breakthroughs in the practical application of acoustic graphene plasmon platforms for next-generation, high-performance, graphene-based optoelectronic devices with enhanced light-matter interactions and lower propagation loss.

Graphene plasmons are collective oscillations of free electrons in graphene that are coupled to electromagnetic waves of light. The oscillations can trap and compress optical waves inside a very thin dielectric layer separating graphene from a metallic sheet, in a system in which graphene’s conduction electrons are “reflected” in the metal so that when the lightwaves “push” the electrons in graphene, their image charges in metal also oscillate. The phenomenon is known as AGP.

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