Flexible and Electrically Tunable Plasmons in Graphene-Mica Heterostructures

Area of Science:

• Nanophotonics and Plasmonics
• Materials Science
• Graphene Electronics

Background:

• Flexible plasmonic devices are crucial for applications like wearable sensors and metamaterials.
• Existing flexible metal-polymer plasmonic structures lack electrical tunability and strain stability.

Purpose of the Study:

• To experimentally demonstrate the first flexible, electrically tunable, and strain-independent plasmons.
• To utilize graphene-mica heterostructures for advanced plasmonic device applications.

Main Methods:

• Fabrication of graphene-mica heterostructures.
• Characterization of plasmon properties under mechanical strain (bending) and electrical modulation.
• Demonstration of plasmon-enhanced infrared spectroscopy for chemical sensing.

Main Results:

• Graphene plasmons in heterostructures showed no degradation in resonance frequency, strength, quality factor, or tunability at bending radii down to 1 mm.
• Device performance remained stable after 1000 bending cycles at a 3 mm radius.
• Plasmon-enhanced infrared spectroscopy detection of chemicals was unaffected by the flexible substrate.

Conclusions:

• Graphene-mica heterostructures offer a robust platform for flexible, electrically tunable plasmonic devices.
• These findings pave the way for developing active flexible nanophotonic devices, including waveguides, resonators, sensors, and modulators.