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Updated: May 12, 2026

Fabricating Metamaterials Using the Fiber Drawing Method
Published on: October 18, 2012
Frequency-multiplexed tunable logic device based on terahertz graphene-integrated metamaterial composed of two
Somayyeh Asgari1, Tapio Fabritius2
1Optoelectronics and Measurement Techniques Research Unit, Faculty of Information Technology and Electrical Engineering, University of Oulu, Oulu, Finland. somayyeh.asgari@oulu.fi.
This study introduces a novel terahertz (THz) graphene metamaterial for frequency-multiplexed logic devices. It demonstrates tunable OR, XNOR, and NAND logic gates at distinct THz frequencies, paving the way for advanced digital systems.
Area of Science:
- Metamaterials and Nanophotonics
- Terahertz (THz) Technology
- Graphene-based Devices
Background:
- Metamaterials offer unique electromagnetic properties.
- Graphene's tunable electronic characteristics are ideal for reconfigurable devices.
- Terahertz (THz) frequencies are crucial for high-speed communication and sensing.
Purpose of the Study:
- To propose and design a novel graphene-based tunable metamaterial.
- To demonstrate its function as a frequency-multiplexed logic device.
- To realize fundamental logic gates (OR, XNOR, NAND) at THz frequencies.
Main Methods:
- Simulation and design of a metamaterial structure using CST Software.
- Development of an equivalent circuit model (ECM) in MATLAB.
- Setting logical inputs via graphene Fermi levels and analyzing reflection spectra for outputs.
Main Results:
- Successful realization of OR, XNOR, and NAND logic gates at three distinct THz frequencies.
- Demonstrated tunability of operating frequencies by adjusting graphene's Fermi level.
- Achieved high extinction ratios (ERs) up to 65.66 dB for the XNOR gate.
Conclusions:
- The proposed graphene metamaterial functions as a versatile, frequency-multiplexed logic device.
- Its simple design and tunable nature show significant potential for THz digital systems.
- This work contributes to the development of advanced integrated THz electronic circuits.
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