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- Title
On-chip single nanoparticle detection and sizing by mode splitting in an ultrahigh-Q microresonator.
- Authors
Jiangang Zhu; Ozdemir, Sahin Kaya; Yun-Feng Xiao; Lin Li; He, Lina; Da-Ren Chen; Lan Yang
- Abstract
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 microresonator. 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.
- Subjects
PARTICLE size determination; NANOPARTICLES; CHEMICAL processes; MICRORESONATORS (Optoelectronics); RESONANCE
- Publication
Nature Photonics, 2010, Vol 4, Issue 1, p46
- ISSN
1749-4885
- Publication type
Article
- DOI
10.1038/nphoton.2009.237