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Graphene-Enhanced Refreshable Metasurface Expands Analytes of THz Label-Free Sensing and Achieves Picogram Limit of
Youxin Chen1,2, Qingkang Wang1, Kaiyu Wu1
1National Key Laboratory of Advanced Micro and Nano Fabrication Technology, Shanghai Jiao Tong University, Shanghai 200240, China.
ACS Sensors
|November 26, 2024
Summary
This study introduces a novel graphene-enhanced terahertz (THz) metasurface sensor. This advanced sensor enables sensitive, label-free detection of chemicals at higher THz frequencies, overcoming limitations of current technologies.
Area of Science:
- Terahertz (THz) spectroscopy and sensing
- Metamaterials and nanophotonics
- Chemical and biological sensing
Background:
- Terahertz (THz) sensing offers unique advantages for detecting biomolecules and chemicals due to strong penetrability and low photon energy.
- Existing label-free THz sensors operate below 1 THz, limiting their application for detecting substances with resonant frequencies in higher THz ranges.
- Achieving picogram-level detection sensitivity in THz sensing remains a significant challenge.
Purpose of the Study:
- To develop a novel graphene-enhanced THz metasurface sensor capable of operating at higher THz frequencies (1.8–2.6 THz).
- To enable label-free detection of analytes with resonant frequencies previously inaccessible to THz sensing.
- To achieve high sensitivity and a low detection limit for trace chemical analysis.
Main Methods:
- Fabrication of a graphene-enhanced THz metasurface.
- Characterization of the metasurface's tunable resonance across the 1.8–2.6 THz range.
- Quantitative analysis of trace 1,3-dinitrobenzene (1,3-DNB) using the sensor, measuring reflectance sensitivity and detection limit.
Main Results:
- The developed sensor exhibits tunable resonance from approximately 1.8 to 2.6 THz, aligning with the fingerprint resonant frequencies of various target analytes.
- First-time quantitative detection of trace 1,3-DNB (absorbing at ~2.52 THz) was achieved.
- A maximum reflectance sensitivity of approximately 10% pmol⁻¹ and a detection limit of 42 pg were demonstrated.
- The sensor proved to be refreshable, offering a cost-effective and environmentally friendly solution.
Conclusions:
- The graphene-enhanced THz metasurface sensor significantly expands the application scope of label-free THz sensing.
- This technology enhances the potential for THz sensing in critical fields such as pharmaceutical analysis, environmental monitoring, and security applications.
- The ability to detect analytes at higher THz frequencies and picogram levels represents a substantial advancement in sensing technology.
