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Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma

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Published on: February 2, 2012

Second harmonic generation in graphene-coated nanowires.

Yixiao Gao, Ilya V Shadrivov

|July 30, 2016

Summary

We demonstrate tunable second harmonic generation in graphene nanowires by adjusting their spacing. Optimizing phase matching with specific modes enhances efficiency, even with graphene losses.

Area of Science:

Optics and Photonics
Materials Science
Nanotechnology

Background:

Second harmonic generation (SHG) is a key nonlinear optical process.
Graphene's unique properties offer potential for enhanced nonlinear optical phenomena.
Controlling phase matching is crucial for efficient SHG in nanostructures.

Purpose of the Study:

To investigate and engineer second harmonic generation in graphene-coated nanowires.
To explore the tunability of phase matching conditions for SHG.
To identify optimal configurations for maximizing SHG efficiency.

Main Methods:

Derivation of coupled mode equations using the Lorentz reciprocity theorem.
Analysis of phase matching conditions by tuning nanowire spacing.

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Numerical modeling of mode overlap and propagation loss.

Main Results:

Phase matching for SHG can be engineered across a wide frequency range by tuning nanowire spacing.
Highest SHG efficiency is achieved by phase matching the fundamental mode with the two lowest order symmetric modes at the second harmonic frequency.
Reducing nanowire radius is predicted to further enhance SHG efficiency due to improved mode overlap and reduced propagation loss.

Conclusions:

Graphene-coated nanowires provide a tunable platform for efficient second harmonic generation.
The presented theoretical framework enables optimization of SHG in such systems.
Further enhancements in SHG efficiency are achievable through careful design of nanowire dimensions and spacing.