Electro-Ionic Control of Surface Plasmons in Graphene-Layered Heterostructures

Area of Science:

• Photonics and optical engineering
• Materials science
• Nanotechnology

Background:

• Precise light control is crucial for subwavelength optical communication devices.
• Plasmonic devices offer extreme field confinement and tunable properties via carrier density modulation.
• Existing plasmonic devices require advanced methods for efficient electrical control.

Purpose of the Study:

• To demonstrate an electro-ionic controlled plasmonic device for optical switching.
• To investigate the role of graphene in enhancing photoinduced voltage.
• To achieve electrical tunability of plasmons for modulating reflected light intensity.

Main Methods:

• Fabrication of a plasmonic device using gold (Au), graphene, and ion-gel.
• Application of an external electric field to modulate the real part of electrical conductivity.
• Utilizing the ion-gel to enable electrical tunability of surface plasmons.

Main Results:

• The Au/graphene/ion-gel device functions as an effective optical switch.
• The graphene layer enhances charge penetration and separation, increasing photoinduced voltage.
• Electrical tuning of plasmons successfully modulates the intensity of reflected laser light.

Conclusions:

• The demonstrated device offers a novel approach for electro-optic switching.
• This technology paves the way for integrated optical devices with electrical tunability.
• The findings contribute to advancements in plasmonic devices for optical communication.