Journal
NATURE PHOTONICS
Volume 4, Issue 1, Pages 46-49Publisher
NATURE PUBLISHING GROUP
DOI: 10.1038/NPHOTON.2009.237
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Funding
- MAGEEP (McDonnell Academy Global Energy and Environment Partnership)
- CMI (Center for Materials Innovation)
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The ability to detect and size individual nanoparticles with high resolution is crucial to understanding the behaviour of single particles and effectively using their strong size-dependent properties to develop innovative products. We report real-time, in situ detection and sizing of single nanoparticles, down to 30 nm in radius, using mode splitting in a monolithic ultrahigh-quality-factor (Q) whispering-gallery-mode micro-resonator. Particle binding splits a whispering-gallery mode into two spectrally shifted resonance modes, forming a self-referenced detection scheme. This technique provides superior noise suppression and enables the extraction of accurate particle size information with a single-shot measurement in a microscale device. Our method requires neither labelling of the particles nor a priori information on their presence in the medium, providing an effective platform to study nanoparticles at single-particle resolution.
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