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Flexible tunable terahertz metasurface sensor based on single-walled carbon nanotubes
Optics Letters
|November 14, 2025
Summary
We developed a flexible terahertz (THz) metasurface sensor using single-walled carbon nanotubes (SWCNTs). This portable device offers dynamic THz wave control and detects GABA at 3.3 mM, paving the way for advanced THz applications.
Area of Science:
- Terahertz (THz) science and technology
- Metamaterials and metasurfaces
- Nanomaterials and nanotechnology
Background:
- Terahertz (THz) modulation is crucial for THz device development.
- Developing portable, real-time THz modulation devices presents significant challenges.
- Single-walled carbon nanotubes (SWCNTs) possess unique properties suitable for sensing.
Purpose of the Study:
- To design and fabricate a flexible, tunable THz metasurface sensor.
- To utilize SWCNTs for dynamic control of THz waves via mechanical deformation.
- To assess the sensor's performance in THz wave manipulation and chemical sensing.
Main Methods:
- Fabrication of a flexible metasurface sensor using SWCNTs.
- Mechanical deformation of the SWCNT-based metasurface to tune THz waves.
- Characterization of the device's tuning range under strain and its limit of detection (LOD) for GABA.
Main Results:
- The flexible sensor achieves a 50 GHz tuning range with only 9% strain.
- The device demonstrates excellent tensile strength and flexibility.
- A limit of detection (LOD) of 3.3 mM for gamma-aminobutyric acid (GABA) was achieved.
Conclusions:
- SWCNT-based flexible metasurfaces offer a promising platform for THz wave manipulation.
- The developed sensor enables dynamic THz control and sensitive chemical detection.
- This technology holds significant potential for portable THz devices and sensing applications.
