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Optimized Fabrication Procedure for High-Quality Graphene-based Moiré Superlattice Devices

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Optical alignment of oval graphene flakes.

E Mobini, A Rahimzadegan, R Alaee

|March 16, 2017

Summary

Graphene flakes can be manipulated using light. Oval graphene flakes can be rotated and oriented by far-infrared light, offering control over their spatial alignment.

Area of Science:

Physics
Materials Science
Nanotechnology

Background:

Atomically thin graphene supports localized surface plasmon polaritons at mid- to far-infrared frequencies.
These properties enable significant optical forces and torques, making graphene suitable for optical manipulation.

Purpose of the Study:

Investigate optical forces and torques on circular and oval graphene flakes.
Explore the spatial alignment of graphene flakes under far-infrared illumination.

Main Methods:

Utilized full-wave numerical simulations.
Employed an analytical model treating graphene flakes in a dipole approximation.

Main Results:

Torque on circular graphene flakes was found to be zero.

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Oval graphene flakes exhibited finite torque, enabling rotation and orientation relative to the electric field polarization.

Alignment direction (parallel or perpendicular) depended on the wavelength.

Conclusions:

Demonstrated effective control over the spatial alignment of graphene flakes using far-infrared light.
Highlighted the potential of patterned graphene for optical manipulation applications.