Su Jingjing, Li Nan, Wang Xianfan, Chen Xingfan, Hu Huizhu
State Key Laboratory of Modern Optical Instrumentation, College of Optical Science and Engineering, Zhejiang University, Hangzhou, 310027, China.
Quantum Sensing Center, Zhejiang Lab, Hangzhou, 310000, China.
Sci Rep. 2021 Jan 8;11(1):125. doi: 10.1038/s41598-020-80470-3.
This study investigates the propagation properties and radiation forces on Rayleigh dielectric particles produced by novel sine-modulated Gaussian beams (SMGBs) because of the unique focusing properties of four independent light intensity distribution centers and possessing many deep potential wells in the output plane of the target laser. The described beams can concurrently capture and manipulate multiple Rayleigh dielectric spheres with high refractive indices without disturbing each other at the focus plane. Spheres with a low refractive index can be guided or confined in the focus but cannot be stably trapped in this single beam trap. Simulation results demonstrate that the focused SMGBs can be used to trap particle in different planes by increasing the sine-modulate coefficient g. The conditions for effective and stable capture of high-index particles and the threshold of detectable radius are determined at the end of this study.
本研究探讨了新型正弦调制高斯光束（SMGBs）对瑞利介质粒子的传播特性和辐射力。由于目标激光输出平面上有四个独立的光强分布中心且具有许多深势阱，该光束具有独特的聚焦特性。所描述的光束能够在焦平面上同时捕获和操纵多个高折射率的瑞利介质球，且互不干扰。低折射率的球体可以在焦点处被引导或限制，但不能稳定地捕获在这种单光束阱中。模拟结果表明，通过增加正弦调制系数g，聚焦的SMGBs可用于在不同平面捕获粒子。本研究最后确定了有效稳定捕获高折射率粒子的条件以及可检测半径的阈值。
