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Terahertz biosensing with a graphene-metamaterial heterostructure platform
- Source :
- Carbon. 141:247-252
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- Terahertz (THz) radiation attracted great interest in the fields of material characterization, nondestructive security screening, clinical diagnostics, and identification of chemicals and molecules. Label-free THz sensing of trace amount of targets including biomolecules is promising because of their rich spectral fingerprint in this electromagnetic region; however, improving the sensitivity remains to be a challenge, partially due to the limitations of THz sources and detectors. The resonantly enhanced electromagnetic fields in metamaterials and metasurfaces offer a potentially viable solution, although highly complicated decoration process is still needed for biosensing on the surface of metamaterials. Here we demonstrate a simple biosensing platform by integrating a monolayer graphene on a THz metamaterial absorber cavity, where the introduction of sensing targets results in a large change of the metamaterial resonant absorption (or reflection) because of their strong interaction with graphene. We experimentally show its ultrahigh sensitivity through detecting trace amount of chlorpyrifos methyl down to 0.2 ng. Using simple decoration steps and utilizing DNA to capture thrombin, we further show the feasibility of this platform serving as a sensitive biosensor. Accepted version The authors gratefully acknowledge the financial support provided by the National Natural Science Foundation of China (No. 31471410) and Research Fund for the Doctoral Program of Higher Education of China (No. 20130101110036). H.T.C acknowledges support in part from LANL LDRD Program and the Center for Integrated Nanotechnologies.
- Subjects :
- Electromagnetic field
Materials science
Terahertz radiation
02 engineering and technology
Terahertz Waves
010402 general chemistry
01 natural sciences
Biosensing Platforms
law.invention
Physics [Science]
law
General Materials Science
chemistry.chemical_classification
business.industry
Graphene
Biomolecule
Metamaterial
Heterojunction
General Chemistry
021001 nanoscience & nanotechnology
0104 chemical sciences
chemistry
Metamaterial absorber
Optoelectronics
0210 nano-technology
business
Biosensor
Subjects
Details
- ISSN :
- 00086223
- Volume :
- 141
- Database :
- OpenAIRE
- Journal :
- Carbon
- Accession number :
- edsair.doi.dedup.....db7cd90164a1f23c378c9b5160bae56a