Nanobore fiber focus trap with enhanced tuning capabilities

0517991 - ÚPT 2020 RIV US eng J - Journal Article
Plidschun, M. - Weidlich, S. - Šiler, Martin - Weber, K. - Čižmár, Tomáš - Schmidt, M.A.
Nanobore fiber focus trap with enhanced tuning capabilities.
Optics Express. Roč. 27, č. 25 (2019), s. 36221-36230. ISSN 1094-4087
R&D Projects: GA MŠMT EF15_003/0000476
Institutional support: RVO:68081731
Keywords : fiber optic sensors * optical fibers
OECD category: Optics (including laser optics and quantum optics)
Impact factor: 3.669, year: 2019
Method of publishing: Open access
https://www.osapublishing.org/oe/fulltext.cfm?uri=oe-27-25-36221&id=423633

Confinement in fiber traps with two optical fibers facing one another relies on
balancing the optical forces originating from the interaction of a scattering micro-object with the light beams delivered through the fibers. Here we demonstrate a novel type of dual fiber trap that involves the use of nanobore fibers, having a nano-channel located in the center of their fiber cores. This nano-element leads to a profound redistribution of the optical intensity and to considerably higher field gradients, yielding a trapping potential with greatly improved tuning properties compared to standard step-index fiber types. We evaluate the trap performance as a function of the fiber separation and find substantially higher stiffness for the nanobore fiber trap, especially in the range of short inter-fiber separations, while intermediate distances exhibit axial stiffness below that of the standard fiber. The results are in agreement with theoretical predictions and reveal that the exploitation of nanobore fibers allows for combinations of transverse and axial stiffness that cannot be accessed with common step-index fibers.
Permanent Link: http://hdl.handle.net/11104/0303209