期刊
OPTICS EXPRESS
卷 18, 期 7, 页码 6988-6993出版社
OPTICAL SOC AMER
DOI: 10.1364/OE.18.006988
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资金
- National Science Foundation [DMR-0855741]
- W. M. Keck Foundation
- Kessler Family Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0922680] Funding Source: National Science Foundation
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [0855741] Funding Source: National Science Foundation
We introduce optical solenoid beams, diffractionless solutions of the Helmholtz equation whose diffraction-limited in-plane intensity peak spirals around the optical axis, and whose wavefronts carry an independent helical pitch. Unlike other collimated beams of light, appropriately designed solenoid beams have the noteworthy property of being able to exert forces on illuminated objects that are directed opposite to the direction of the light's propagation. We demonstrate this through video microscopy observations of a colloidal sphere moving upstream along a holographically projected optical solenoid beam.
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