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Optical bistability in graphene-wrapped dielectric nanowires
Optics Express
|August 10, 2017
Summary
Graphene-wrapped cylinders exhibit optical bistability, a phenomenon tunable by material properties and size. This research paves the way for novel all-optical switching and nano-memory devices in the terahertz spectrum.
Area of Science:
- Photonics and Nanotechnology
- Nonlinear Optics
- Plasmonics
Background:
- Optical bistability is crucial for all-optical switching devices.
- Graphene's unique plasmonic properties offer potential for novel optical applications.
- Dielectric cylinders can support optical resonances that interact with plasmonic materials.
Purpose of the Study:
- To investigate the optical bistability of graphene-wrapped dielectric cylinders.
- To explore the influence of Kerr-type nonlinearity and graphene plasmonics on optical response.
- To identify parameters for tuning bistable properties and potential applications.
Main Methods:
- Nonlinear full-wave scattering theory
- Nonlinear quasistatic theory
- Analysis of near-field and far-field spectra
- Excitation of electric dipolar modes
Main Results:
- Observed typical optical bistability in both near-field and far-field spectra.
- Identified a new bistable region with high electromagnetic fields, indicating a tunable magnetic dipole.
- Demonstrated tunability of switching threshold fields by adjusting nanocylinder size, permittivity, and graphene chemical potential.
Conclusions:
- Graphene-wrapped dielectric cylinders exhibit tunable optical bistability.
- The interaction between Kerr nonlinearity and graphene plasmonics is key to this phenomenon.
- These structures show promise for all-optical switching and nano-memory applications in the terahertz region.
