期刊
OPTICS EXPRESS
卷 17, 期 8, 页码 6230-6238出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.17.006230
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资金
- National Science Foundation - Division of Bioengineering and Environmental Systems [0522668]
- Rowland Junior Fellowship
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0820341] Funding Source: National Science Foundation
- Div Of Chem, Bioeng, Env, & Transp Sys
- Directorate For Engineering [0522668] Funding Source: National Science Foundation
Individual nanoparticles in aqueous solution are observed to be attracted to and orbit within the evanescent sensing ring of a Whispering Gallery Mode micro-sensor with only microwatts of driving power. This Carousel trap, caused by attractive optical gradient forces, interfacial interactions, and the circulating momentum flux, considerably enhances the rate of transport to the sensing region, thereby overcoming limitations posed by diffusion on such small area detectors. Resonance frequency fluctuations, caused by the radial Brownian motion of the nanoparticle, reveal the radial trapping potential and the nanoparticle size. Since the attractive forces draw particles to the highest evanescent intensity at the surface, binding steps are found to be uniform. (C) 2009 Optical Society of America
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