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Angular-Dependent THz Modulator with Hybrid Metal-Graphene Metastructures
Huan Wang1, Jiajun Linghu1, Xuezhi Wang1
1School of Science, Chang'an University, Xi'an 710061, China.
Nanomaterials (Basel, Switzerland)
|July 14, 2023
Summary
This study presents an angular-dependent terahertz (THz) modulator using hybrid metal-graphene metastructures. The device achieves significant THz transmission modulation, showing promise for advanced THz sensing and spectroscopy applications.
Area of Science:
- Metamaterials and Plasmonics
- Terahertz (THz) Technology
- Graphene-based Devices
Background:
- Surface plasmon resonance (SPR) in metamaterials influences plasmonic mode frequency and intensity.
- Metamaterials offer tunable optical properties for advanced device applications.
Purpose of the Study:
- To develop an angular-dependent terahertz (THz) modulator utilizing hybrid metal-graphene metastructures.
- To investigate the modulation of THz transmission based on incident angle and electrical gating.
Main Methods:
- Fabrication of hybrid metastructures with gold split-rod arrays on monolayer graphene.
- Utilizing ion-gel electrical gating for active tuning of graphene conductivity.
- Experimental measurement of THz transmission modulation with varying incident angles and gate voltages.
Main Results:
- Demonstrated redshift modulation in the THz region with increasing incident angle.
- Achieved a modulation depth of ~37.6% at 0.62 THz with a -3 V gate voltage.
- Theoretical modeling accurately predicted experimental results for THz transmission dependency on frequency and incident angle.
Conclusions:
- The hybrid metal-graphene metastructure serves as an effective angular-dependent THz modulator.
- This device offers a novel approach for THz applications requiring angle-dependent modulation, such as sensors and spectroscopy.
