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Terahertz bistability and multistability in graphene/dielectric Fibonacci multilayer
Applied Optics
|October 20, 2017
Summary
This study demonstrates graphene/dielectric Fibonacci multilayers for terahertz (THz) bistability and multistability. High-quality graphene and tunable parameters enable advanced THz switching and logic gate applications.
Area of Science:
- Nonlinear optics
- Condensed matter physics
- Materials science
Background:
- Graphene exhibits strong nonlinear optical properties.
- Fibonacci multilayers offer diverse resonant behaviors.
- Terahertz (THz) frequency applications require advanced optical components.
Purpose of the Study:
- To achieve bistability and multistability in the THz range using graphene/dielectric Fibonacci multilayers.
- To investigate the role of resonances in achieving multi-stable states.
- To explore methods for tuning and optimizing the observed phenomena.
Main Methods:
- Nonlinear transfer matrix method for theoretical analysis.
- Examination of Fibonacci multilayer resonances for bistability.
- Analysis of switching dynamics under varying incident wave intensity.
Main Results:
- Demonstrated bistability and multistability in the THz frequency range.
- Observed various switching behaviors (single/stepwise jumps) between states.
- Identified high-quality graphene as crucial for reduced switching thresholds and wider multistable regions.
- Showcased tunability of the phenomena via frequency, angle, and graphene Fermi level.
Conclusions:
- Graphene/dielectric Fibonacci multilayers are effective for THz bistability and multistability.
- The system offers tunable switching and multistable behaviors.
- Potential applications include THz switches and logic gates.
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