{Reference Type}: Journal Article
{Title}: High-Verdet Constant and Low-Optical Loss Tb3+ Doped Magnetite Nanoparticles.
{Author}: Bartos J;Ba Tis T;Nie M;Huang SW;Park W;
{Journal}: Nano Lett
{Volume}: 24
{Issue}: 30
{Year}: 2024 Jul 31
{Factor}: 12.262
{DOI}: 10.1021/acs.nanolett.4c01094
{Abstract}: Magneto-optical (MO) polymer nanocomposites have emerged as alternatives to conventional MO crystals, particularly in nanophotonics applications, thanks to their better processing flexibility and superior Verdet constants. However, a higher Verdet constant commonly comes with excessive optical loss due to increased absorption and scattering, resulting in a constant or reduced figure-of-merit (FOM) defined as the Verdet constant over optical loss. By doping magnetite (Fe3O4) nanoparticles with Tb3+ ions, we report a new strategy to enhance the Verdet constant without increasing the optical loss. The Fe3O4:Tb3+ nanocomposite is one of a kind that simultaneously achieves a state-of-the-art Verdet constant of 5.6 × 105 °/T·m and a state-of-the-art FOM of 31°/T in the near-infrared region.