Journal
ACS PHOTONICS
Volume 7, Issue 1, Pages 88-97Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.9b01024
Keywords
optical trapping; converging counter-propagating beams; two photon polymerization; microstructured fiber; diffractive optical elements; diffractive Fresnel lenses
Categories
Funding
- BMBF
- BW Stifung
- DFG [SPP1839, SPP1929]
- ERC
- ERCPoC
- National Science Foundation (NSF) [1253236, 0868895, 1222301]
- Program 973 [2014AA014402]
- French National Research Agency [ANR-16-CE24-00-01]
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Highly efficient counter-propagating fiber-based optical traps are presented which utilize converging beams from fibers with 3D printed diffractive Fresnel lenses on their facet. The use of a converging beam instead of diverging beam in dual-fiber traps creates a strong trapping efficiency in both the axial and the transverse directions. Converging beams with a numerical aperture of up to 0.7 are produced by diffractive Fresnel lenses. These lenses also provide a large focal distance of up to 200 mu m in a moderately high refractive index medium. Fabrication of such diffractive lenses with microsized features at the tip of a fiber is possible by femtosecond two photon lithography. In comparison to chemically etched fiber tips, the normalized trap stiffness of dual-fiber tweezers is increased by a substantial factor of 35-50 when using a converging beam produced by diffractive Fresnel lenses. The large focal length provided by these diffractive structures allows working at a large fiber-to-fiber distance, which leads to larger space and the freedom to combine other spectroscopy and analytical methods in combination with trapping.
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