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Dynamically tunable band stop filter enabled by the metal-graphene metamaterials
Yan Liu1,2, Renbin Zhong3,4,5, Zhen Lian1,2
1Terahertz Research Centre, School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu, Sichuan, 610054, China.
Scientific Reports
|February 14, 2018
Summary
A novel tunable band stop filter using metal-graphene metamaterials offers dynamic control over mid-infrared frequencies. This flexible design enables multispectral applications and sensing with high sensitivity.
Area of Science:
- Metamaterials
- Optoelectronics
- Nanotechnology
Background:
- Metamaterials offer unique electromagnetic properties.
- Graphene's tunable electronic characteristics are valuable for dynamic control.
- Mid-infrared frequencies are crucial for various sensing and communication applications.
Purpose of the Study:
- To propose and investigate a dynamically tunable band stop filter.
- To explore the use of metal-graphene metamaterials for mid-infrared applications.
- To demonstrate the filter's potential for multispectral devices and sensing.
Main Methods:
- Numerical investigation of a filter design based on gold strips on monolayer graphene and BaF2 substrate.
- Analysis of modulation depth, stop-band number, and tunability.
- Assessment of sensitivity to changes in the surrounding medium.
Main Results:
- Achieved a stable modulation depth up to -23.26 dB.
- Demonstrated control over the number of stop-bands by varying gold strip amounts.
- Showcased dynamic tunability of stop-band locations via graphene's Fermi energy level.
- Observed high sensitivity (2393 nm/RIU) for index-based sensing.
Conclusions:
- The proposed metal-graphene filter provides a simple, flexible approach for tunable multispectral devices.
- The design is suitable for on-plane or integrated micro-structure research.
- Potential applications include multi-band stop filters, sensors, and graphene-based multispectral devices.
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