Journal
NANO LETTERS
Volume 21, Issue 6, Pages 2453-2460Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c04706
Keywords
magnetic nanoprobe; optical magnetism; silicon nanoparticle; Mie resonance; multiphoton photoluminescence
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Funding
- National Key Research and Development Program of China [2016YFA0201002]
- National Natural and Science Foundation of China [11674110, 11874020, 11904110]
- Natural Science Foundation of Guangdong Province, China [2016A030308010]
- China Postdoctoral Science Foundation [2019M652930]
- Startup Foundation of Institute of Semiconductors, Chinese Academy of Sciences [E0SEBB01]
- Research Grants Council of Hong Kong (GRF Grant) [15303417]
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This study demonstrates that silicon nanoparticles can be used to detect the magnetic component of unknown optical fields, achieving optical magnetism-driven multiphoton luminescence and direct mapping of the magnetic field intensity distribution of tightly focused femtosecond laser beams. This work establishes a powerful nonlinear optics paradigm for probing optical magnetic fields of arbitrary electromagnetic structures.
To detect the magnetic component of arbitrary unknown optical fields, a candidate probe must meet a list of demanding requirements, including a spatially isotropic magnetic response, suppressed electric effect, and wide operating bandwidth. Here, we show that a silicon nanoparticle satisfies all these requirements, and its optical magnetism driven multiphoton luminescence enables direct mapping of the magnetic field intensity distribution of a tightly focused femtosecond laser beam with varied polarization orientation and spatially overlapped electric and magnetic components. Our work establishes a powerful nonlinear optics paradigm for probing unknown optical magnetic fields of arbitrary electromagnetic structures, which is not only essential for realizing subwavelength-scale optical magnetometry but also facilitates nanophotonic research in the magnetic light-matter interaction regime.
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