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Active control of an edge-mode-based plasmon-induced absorption sensor.
Applied Optics
|May 2, 2018
Summary
We demonstrate a tunable plasmon-induced absorption (PIA) window in graphene nanoribbons, showing potential for sensing and ultrafast light applications. This effect is sensitive to environmental changes and controllable via graphene
Area of Science:
- Plasmonics
- Nanophotonics
- Graphene photonics
Background:
- Plasmon-induced absorption (PIA) is a key phenomenon in nanophotonics.
- Graphene nanoribbons offer unique optical properties for controlling light-matter interactions.
Purpose of the Study:
- Investigate the formation and tunability of PIA in a 3D graphene waveguide.
- Explore the potential applications of this PIA effect in sensing and ultrafast optics.
Main Methods:
- Simulated PIA in a three-dimensional graphene waveguide structure.
- Analyzed near-field coupling, destructive interference, and resonance characteristics.
- Investigated dependence on coupling distance, environmental refractive index, and Fermi energy.
Main Results:
- Formed a PIA window via graphene edge mode coupling and destructive interference.
- Observed strong dependence of resonance intensity on coupling distance and environmental refractive index.
- Achieved active control of resonant wavelength by tuning Fermi energy.
- Demonstrated a group time delay of -0.28 ps and the possibility of double-channel PIA windows.
Conclusions:
- The proposed graphene nanoribbon structure provides a tunable PIA window.
- This platform shows promise for highly integrated plasmonic devices, sensing applications, and ultrafast light control.
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