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APS » Journals » Phys. Rev. Lett. » Volume 92 » Issue 22
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Phys. Rev. Lett. 92, 220801 (2004) [4 pages]

Tip-Enhanced Coherent Anti-Stokes Raman Scattering for Vibrational Nanoimaging

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Taro Ichimura1, Norihiko Hayazawa1,4, Mamoru Hashimoto2,4, Yasushi Inouye3,4,5,*, and Satoshi Kawata1,4,5
1Department of Applied Physics, Osaka University, Suita, Osaka 565-0871, Japan
2Department of Mechanical Engineering and Bioengineering, Osaka University, Toyonaka, Osaka 560-8531, Japan
3Graduate School of Frontier Biosciences, Osaka University, Suita, Osaka 565-0871, Japan
4CREST, Japan Corporation of Science and Technology, Japan
5RIKEN, Wako, Saitama, 351-0198, Japan

Received 17 October 2003; published 2 June 2004

See accompanying Physics Focus

An electric field enhanced by a metallic nanoprobe has locally induced coherent anti-Stokes Raman scattering (CARS) of adenine molecules in a nanometric DNA network structure. Owing to the third-order nonlinearity, the excitation of the CARS polarization is extremely confined to the end of the tip apex, resulting in a spatial resolution far beyond the diffraction limit of light. Our tip-enhanced CARS microscope visualized the DNA network structure at a specific vibrational frequency (∼1337  cm-1) corresponding to the ring-breathing mode of diazole of adenine molecules.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.220801
DOI:
10.1103/PhysRevLett.92.220801
PACS:
07.79.Fc, 42.65.Dr, 68.37.Uv

*Corresponding author.

Email address: ya-inoue@ap.eng.osaka-u.ac.jp

 
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