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Graphene plasmon propagation on corrugated silicon substrates
Optics Letters
|December 23, 2014
Summary
Graphene plasmons on corrugated silicon substrates show significantly reduced propagation loss in the mid-infrared. This enhancement, achieved by introducing air grooves, doubles plasmon propagation length, enabling compact waveguide designs.
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Graphene on silicon substrates offers microelectronic compatibility.
- Silicon's high permittivity causes significant ohmic loss for graphene plasmons.
Purpose of the Study:
- To reduce propagation loss of graphene plasmons.
- To investigate graphene plasmons on corrugated silicon substrates.
Main Methods:
- Numerical investigation of graphene plasmon properties.
- Analysis considering ohmic and scattering losses.
- Exploration of photon frequency and geometric parameters.
Main Results:
- Air grooves in silicon substrates decrease optical thickness and propagation loss.
- Plasmon propagation lengths on corrugated substrates exceed those on flat silicon by over two times.
- Broadband enhancement observed in the mid-infrared spectrum.
Conclusions:
- Corrugated silicon substrates significantly improve graphene plasmon propagation.
- This approach is promising for developing compact mid-infrared waveguides.
- Potential for advancing graphene-based photonic integrated circuits.
