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Tunable light absorption of graphene using topological interface states.
Optics Letters
|August 16, 2020
Summary
Tunable light absorption in graphene is achieved using topological interface states (TISs) within asymmetric topological photonic crystals (ATPCs). This method enhances light-graphene interactions for optoelectronic devices.
Area of Science:
- Condensed matter physics
- Photonics
- Materials science
Background:
- Graphene exhibits unique electronic properties.
- Topological photonic crystals (TPCs) offer novel light manipulation capabilities.
- Enhancing light-matter interactions in graphene is crucial for optoelectronics.
Purpose of the Study:
- To present a tunable light absorption method for graphene.
- To explore the use of topological interface states (TISs) for enhanced light absorption.
- To investigate the application of asymmetric topological photonic crystals (ATPCs) for modulating graphene's optical properties.
Main Methods:
- Embedding monolayer graphene at the interface of ATPCs.
- Exciting TISs to induce strong light absorption.
- Analyzing the dependence of absorption spectra on graphene's chemical potential and ATPC's periodic number.
Main Results:
- A strong light absorption phenomenon was observed due to TIS excitation.
- Absorption spectra showed significant dependence on graphene's chemical potential and ATPC's periodic number.
- Absorption was rapidly switchable via gate voltage-modulated chemical potential variations.
Conclusions:
- The study demonstrates a novel approach for tunable light absorption in graphene.
- This method significantly enhances light-graphene interactions.
- The findings pave the way for high-absorption optoelectronic devices utilizing TISs in ATPCs.
