PtNi Nonlinear Photonics PtNi octahedral alloy nanoparticles, oil-phase synthesized, depict an alloyed platform for nonlinear photonics. Near-infrared multiwavelength Q-switched operation is realized in 1-, 1.5-, and 2-µm bands with PtNi saturable absorbers. First principles calculations identify surface ferromagnetic Ni as the major absorption center, enabling the enhanced nonlinear response and broadband ultrafast modulation. More details can be found in the Research Article by Bo Fu, Haichang Lu, Wei Zhou, and co-workers (DOI: 10.1002/adom.202502331).
Chao et al. (Thu,) studied this question.