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Local nonlinearity engineering of evanescent-field-interaction fiber devices embedding in black phosphorus quantum dots

Nanophotonics (Berlin, Germany), 2022-01, Vol.11 (1), p.87-100 [Peer Reviewed Journal]

2022. This work is published under http://creativecommons.org/licenses/by/4.0 (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 2192-8614 ;ISSN: 2192-8606 ;EISSN: 2192-8614 ;DOI: 10.1515/nanoph-2021-0513

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  • Title:
    Local nonlinearity engineering of evanescent-field-interaction fiber devices embedding in black phosphorus quantum dots
  • Author: Jiang, Yuyuan ; Zhou, Jian ; Lou, Bowen ; Liu, Jing ; Xu, Yanhua ; Zhao, Junqing ; Li, Lei ; Tang, Dingyuan ; Shen, Deyuan
  • Subjects: Absorption ; black phosphorus quantum dots ; evanescent field ; fiber laser ; local nonlinearity ; Nonlinearity ; Phosphorus ; Quantum dots ; Thickness
  • Is Part Of: Nanophotonics (Berlin, Germany), 2022-01, Vol.11 (1), p.87-100
  • Description: Tapered fiber (TF) and D-shaped fiber (DF) are two types of widely investigated devices in facilitating evanescent-field interactions with external materials. Although they have been found to be particularly useful in various ultrafast regimes, to date there is still no clear or systematic investigation on their local nonlinearities as well as the exerted influences on ultrafast behaviors. Herein, we present such thorough investigation through local nonlinearity engineering on TF and then in contrast with a DF as a reference. Optically deposited black phosphorus quantum dots (BPQDs) are used for saturable absorption. The nanometer-scale extremely small sizes of the BPQDs helpfully eliminate size-induced uncertainties or distortions during both device fabrication and the latter light–matter interaction. For the TF, in the experiment, it is found that the local nonlinear effect starts to be rather appreciable as the TF shrinks to a moderate thickness. Remarkably in comparison, the local nonlinearity of the DF itself can even be neglected reasonably, but after coating with BPQDs, it possesses a much larger modulation depth than any of the used BPQDs-coated TFs with different thicknesses/lengths. Further, we theoretically analyze the related locally nonlinear effects and reveal, for the first time, the direct origin of saturable absorption with evanescent-field-based general structures.
  • Publisher: Berlin: De Gruyter
  • Language: English
  • Identifier: ISSN: 2192-8614
    ISSN: 2192-8606
    EISSN: 2192-8614
    DOI: 10.1515/nanoph-2021-0513
  • Source: De Gruyter Journals Open Access
    ProQuest Central
    DOAJ Directory of Open Access Journals
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