摘要
在一定条件下经过高数值孔径聚焦后的激光可以捕获微米量级的微粒,这种技术称为光镊。光阱与捕陷粒子间存在角动量传递会产生光扭矩,采用T矩阵方法实现了显微量级光扭矩的测量。仿真结果验证了T矩阵方法的计算高效性,同时分析了光阱参数对光扭矩效率的影响,为光扭矩的实际应用提供了理论依据。微光扭矩的测量具有广阔的应用前景。
A tightly focused laser beam can trap particles of size ranging from tens of nanometers to tens of micrometers. In the process, angular momentum is transfered from the traping beam to the traped particles and micro optical torque is generated. The calculation of the optical torqne is complicated. A method of using T-matrix to compute the optical torque is presented. Optical trap parameters affecting the torque is analyzed. Simulations prove the effiency of the T matrix and that offers a tool for the analysis of optical torque.
出处
《激光与红外》
CAS
CSCD
北大核心
2010年第6期601-603,共3页
Laser & Infrared
基金
国家自然科学基金项目(No.50575193)资助
关键词
光阱
微扭矩
T矩阵
电磁散射
optical trap
micro torque
T-matrix
electromagnetic scattering
