Version 2 2021-03-04, 17:09Version 2 2021-03-04, 17:09
Version 1 2021-03-02, 20:46Version 1 2021-03-02, 20:46
journal contribution
posted on 2021-03-04, 17:09authored byGuang-Can Li, Jin Xiang, Yong-Liang Zhang, Fu Deng, Mingcheng Panmai, Weijie Zhuang, Sheng Lan, Dangyuan Lei
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.