Journal
NATURE PHOTONICS
Volume 9, Issue 1, Pages 68-72Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2014.283
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Funding
- Natural Sciences and Engineering Research Council Discovery
- National Science Foundation postdoctoral fellowship programme
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Colloidal quantum dots, viruses, DNA and all other nanoparticles have acoustic vibrations that can act as 'fingerprints' to identify their shape, size and mechanical properties, yet high-resolution Raman spectroscopy in this low-energy range has been lacking. Here, we demonstrate extraordinary acoustic Raman (EAR) spectroscopy to measure the Raman-active vibrations of single isolated nanoparticles in the 0.1-10 cm(-1) range with similar to 0.05 cm(-1) resolution, to resolve peak splitting from material anisotropy and to probe the low-frequency modes of biomolecules. EAR employs a nanoaperture laser tweezer that can select particles of interest and manipulate them once identified. We therefore believe that this nanotechnology will enable expanded capabilities for the study of nanoparticles in the materials and life sciences.
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