Developments of a contactless-sample hold system by an optical trap to study rapid crystallization process

研制了一种用于单个亚微米颗粒的光阱样品保持器。利用反向传播激光束产生的辐射压力使粒径为380 nm的CeO_2颗粒悬浮起来，并用高通量聚焦同步辐射束辐照。单个颗粒的衍射花样与CeO_2的衍射花样一致，但晶格收缩接近颗粒集合体晶格常数的1.2%。

An optical-trap sample holder for a single submicrometer-sized particle has been developed. A CeO_2 particle 380 nm in size is successfully levitated with radiation pressure force exerted by counterpropagating laser beams and irradiated by a high-flux ocused synchrotron radiation beam. The diffraction pattern of a single particle is consistent with that of CeO_2 but the lattice hrink approaches 1.2 % of the lattice constant of particle assemblage.