论文标题
在六个自由度下的铁磁掺杂的上转换微粒的同时光学诱捕和磁微观计量
Simultaneous optical trapping and magnetic micromanipulation of ferromagnetic iron-doped upconversion microparticles in six degrees of freedom
论文作者
论文摘要
众所周知，由于其高折射率，磁性氧化物颗粒的光学诱捕非常困难，更不用说在诱捕的红外波长处具有高吸收性。我们合成了Fe共掺杂的Nayf4：Yb，Er铁磁上流颗粒，这些颗粒不仅具有有利于光学诱捕的折射率，而且在异性波长下的热量小于赤铁矿颗粒。这些颗粒是六角形的，其尺寸为3千分尺，还具有20吨和饱和磁性1 am^2/kg的较高的牢固性。这使同时使用光学诱捕和磁力可以在刚体的所有六个自由度中产生微操作。我们还表明，当在975 nm的吸收共振时显着加热这些颗粒，同时发出可见光，可能对荧光显微镜和癌细胞的光热治疗产生影响。
Optical trapping of magnetic Fe-oxide particles is notoriously difficult due to their high refractive indices, not to mention high absorptivity at the trapping infra-red wavelengths. We synthesize Fe co-doped NaYF4:Yb,Er ferromagnetic upconversion particles that not only have refractive indices conducive for optical trapping, but also heat less than Haematite particles at off-resonant wavelengths. These particles are hexagonal shaped with dimensions of the order of 3 micrometer and also bear high coercivity of 20 mT and saturation magnetisation of 1 Am^2/kg. This enables simultaneous use of optical trapping and magnetic forces to generate micro-manipulation in all the six degrees of freedom of a rigid body. We also show that these particles heat significantly when illuminated on absorption resonance at 975 nm while emitting visible light with possible implications for fluorescence microscopy and photothermal therapy of cancer cells.
