Hidai Hirofumi, Matsushita Makoto, Matsusaka Souta, Chiba Akira, Morita Noboru
Department of Mechanical Engineering, Chiba University, Chiba, 263-8522, Japan.
Opt Express. 2013 Aug 12;21(16):18955-62. doi: 10.1364/OE.21.018955.
We optically manipulated a metal particle in borosilicate glass. The glass in the neighborhood of the laser-heated metal particle softened; hence, the metal particle was able to migrate in the glass. In this letter, the driving force of the metal particle toward the light source in the glass provided by laser illumination was investigated. The variation in the surface tension of the glass at the interface between the glass and the metal particle induced by the temperature gradient was calculated via a numerical temperature calculation. It was found that the temperature at the laser-illuminated surface of a stainless-steel particle with a radius of 40 μm was ~320 K higher than that on the nonilluminated side. The force applied to the metal particle from the surrounding glass was calculated to be ~100 μN, which was approximately equal to the viscous resistance force. In addition, the experimental and numerically calculated speeds of the moving particle, which was measured while varying the laser power, are discussed.
我们在硼硅酸盐玻璃中对金属颗粒进行了光学操控。激光加热的金属颗粒附近的玻璃软化，因此金属颗粒能够在玻璃中迁移。在这篇信函中，研究了激光照射在玻璃中为金属颗粒提供的朝向光源的驱动力。通过数值温度计算，得出了由温度梯度引起的玻璃与金属颗粒界面处玻璃表面张力的变化。结果发现，半径为40μm的不锈钢颗粒受激光照射表面的温度比未照射侧高约320K。计算得出，周围玻璃施加在金属颗粒上的力约为100μN，这与粘性阻力大致相等。此外，还讨论了在改变激光功率时测量的移动颗粒的实验速度和数值计算速度。
