High-resolution imaging of graphene by tip-enhanced coherent anti-Stokes Raman scattering

Coherent anti-Stokes Raman scattering (CARS) is able to enhance molecular signals by vibrational coherence compared to weak Raman signal. The surface or tip enhancement are successful technologies, which make it possible for Raman to detect single molecule with nanometer resolution. However, due to...

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Bibliographic Details
Published in:Journal of innovative optical health science 2019-01, Vol.12 (1), p.1841003-1-1841003-7
Main Authors: Kou, Xiaolong, Zhou, Qian, Wang, Dong, Yuan, Jinghe, Fang, Xiaohong, Wan, Lijun
Format: Article
Language:English
Subjects:
CARS
Coherent scattering
Graphene
Image resolution
Organic chemistry
Raman spectra
Research Article
Sensitivity
Substrates
Tip-enhanced coherent anti-Stokes Raman scattering
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Summary:Coherent anti-Stokes Raman scattering (CARS) is able to enhance molecular signals by vibrational coherence compared to weak Raman signal. The surface or tip enhancement are successful technologies, which make it possible for Raman to detect single molecule with nanometer resolution. However, due to technical difficulties, tip-enhanced CARS (TECARS) is not as successful as expected. For single molecular detection, high sensitivity and resolution are two main challenges. Here, we reported the first single atom layer TECARS imaging on Graphene with the highest resolution about 20 nm, which has ever been reported. The highest EF TECARS ∕ CARS is about 104, the similar order of magnitude with SECARS (EF of tip is usually smaller than that of substrates). Such resolution and sensitivity is promising for medical, biology and chemical applications in the future.
ISSN:1793-5458
1793-7205
DOI:10.1142/S1793545818410031