Author(s): Li, GC (Li, Guang-Can); Xiang, J (Xiang, Jin); Zhang, YL (Zhang, Yong-Liang); Deng, F (Deng, Fu); Panmai, M (Panmai, Mingcheng); Zhuang, WJ (Zhuang, Weijie); Lan, S (Lan, Sheng); Lei, DY (Lei, Dangyuan)

Source: NANO LETTERS Volume: 21 Issue: 6 Pages: 2453-2460 DOI: 10.1021/acs.nanolett.0c04706 Published: MAR 24 2021

Abstract: 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.

Accession Number: WOS:000634766600015

PubMed ID: 33651622

Author Identifiers:

Author        Web of Science ResearcherID        ORCID Number

Lei, Dangyuan         B-9812-2011         0000-0002-8963-0193

Li, Guangcan                  0000-0002-9903-8900

ISSN: 1530-6984

eISSN: 1530-6992

Full Text: https://pubs.acs.org/doi/10.1021/acs.nanolett.0c04706