Upсonversion luminescence particles based on NaYF4 matched with passive optical devices
The work is aimed at creating matching passive elements with optical planar devices. A three-dimensional structure-interface was made to match the position of the center of the optical fiber with active optical elements. NaYF4 microparticles doped with rare-earth ions Yb3+, Tm3+, Er3+ with a diameter of 2.2 µm and 1.65 um were synthesized. The formation of hemispherical lenses with radii from 0.75 to 25 um has been demonstrated for optical matching
with optical fiber by IR (infrared) photopolymerization.