Journal
OPTICS LETTERS
Volume 43, Issue 12, Pages 2784-2786Publisher
OPTICAL SOC AMER
DOI: 10.1364/OL.43.002784
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Funding
- National Natural Science Foundation of China (NSFC) [61675053, 61775047, 61705051]
- 111 Project [B13015]
- Fundamental Research Funds for Harbin Engineering University of China
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We proposed and experimentally demonstrated 3-dimensional dark traps for low refractive index bio-cells using a single optical fiber Bessel beam. The Bessel beam was produced by concatenating single-mode fiber and a step index multimode fiber, which was then focused by a high refractive index glass microsphere integrated on the fiber end facet. The focused Bessel beam provided two dark fields along the axial direction, where stable trapping of low refractive index bio-cells was realized in a high refractive index liquid bath. The all-fiber and seamlessly integrated structure of the proposed scheme can find ample potential as a micro-optical probe in in situ characterization and manipulation of multiple bio-cells with refractive indices lower than that of the liquid bath. (C) 2018 Optical Society of America
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