Ultrafast Magneto-Optics in Nickel Magnetoplasmonic Crystals.
basic_science · Level V
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- Record sourced from PubMed, PMID 33238104.
- Also identified by DOI 10.1021/acs.nanolett.0c03305.
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Abstract
Here, we report on ultrafast all-optical modulation of the surface-plasmon (SP)-assisted transverse magneto-optical Kerr effect (TMOKE) and the reflectance in a one-dimensional nickel magnetoplasmonic crystal (MPC). A 50 fs nonresonant laser pump pulse with 7 mJ/cm<sup>2</sup> fluence reduces the magnetization by 65%, which results in the suppression of TMOKE in the SP-resonant probe from 1.15% to 0.4%. The differential reflectance of SP-resonant probe achieves 5.5%. Besides this, it is shown that electron thermalization and relaxation in MPC are several times slower than those in the plane nickel.