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Tunable terahertz reflection of graphene via ionic liquid gating
Yang Wu1,2,3, Xuepeng Qiu1, Hongwei Liu3
1Department of Electrical and Computer Engineering, National University of Singapore, 117576, Singapore.
Nanotechnology
|January 10, 2017
Summary
We demonstrate a highly efficient tunable terahertz (THz) reflector using graphene. Applying a small gate voltage modulates graphene
Area of Science:
- Solid-state physics
- Materials science
- Optics
Background:
- Graphene's unique electronic properties offer potential for novel optical components.
- Terahertz (THz) technology requires efficient and tunable optical elements for various applications.
Purpose of the Study:
- To develop a highly efficient and tunable THz reflector utilizing graphene.
- To investigate the modulation of graphene's reflectance via gate voltage.
Main Methods:
- Fabrication of graphene/ionic liquid structures.
- Measurement of graphene reflectance across a wide spectral range (0.1-1.5 THz).
- Application of gate voltages (up to ±3 V) to tune reflectance.
Main Results:
- Achieved tunable reflectance modulation from 0.79% to 33.4% at room temperature.
- Demonstrated uniform reflection tuning over the broad 0.1-1.5 THz spectral range.
- Explained the observed phenomenon using the Drude model, highlighting intraband transitions.
Conclusions:
- Graphene-based structures provide an efficient method for tunable THz reflection.
- The developed tunable reflector has potential applications in broadband THz mirrors, deformable THz mirrors, and variable THz beam splitters.
