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Local nonlinearity engineering of evanescent-field-interaction fiber devices embedding in black phosphorus quantum
Yuyuan Jiang1, Jian Zhou1, Bowen Lou1
1Jiangsu Key Laboratory of Advanced Laser Materials and Devices, Jiangsu Collaborative Innovation Center of Advanced Laser Technology and Emerging Industry, School of Physics and Electronic Engineering, Jiangsu Normal University, Xuzhou 221116, Jiangsu, China.
This study investigates local nonlinearities in tapered fibers (TF) and D-shaped fibers (DF) using black phosphorus quantum dots (BPQDs). Results show engineered TFs and BPQD-coated DFs exhibit significant nonlinear effects for ultrafast applications.
Area of Science:
- Photonics and Nanomaterials Science
- Ultrafast Optics and Nonlinear Phenomena
Background:
- Tapered fibers (TF) and D-shaped fibers (DF) are crucial for evanescent-field interactions.
- Systematic investigation of their local nonlinearities and ultrafast behavior influence is lacking.
Purpose of the Study:
- To conduct a thorough investigation of local nonlinearities in TF and DF.
- To engineer local nonlinearity in TF and contrast it with DF.
- To reveal the origin of saturable absorption in evanescent-field structures.
Main Methods:
- Optical deposition of black phosphorus quantum dots (BPQDs) for saturable absorption.
- Experimental fabrication and characterization of TFs with varying thicknesses.
- Theoretical analysis of local nonlinear effects.
Main Results:
- Local nonlinear effects in TFs become appreciable at moderate thicknesses.
- BPQD-coated DFs exhibit significantly higher modulation depth compared to BPQD-coated TFs.
- Size-induced uncertainties from BPQDs are minimized due to their nanometer-scale.
Conclusions:
- Local nonlinearity can be engineered in TFs for enhanced performance.
- DFs, when coated with BPQDs, offer superior modulation depth for saturable absorption.
- The study elucidates the fundamental origin of saturable absorption in evanescent-field devices.
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