Laser Bio/Nano Science Laboratory of National Chiao Tung University.
Sci Prog. 2013;96(Pt 1):1-18. doi: 10.3184/003685013X13592844053451.
Optical trapping with continuous-wave lasers has been a fascinating field in the optical manipulation. It has become a powerful tool for manipulating micrometer-sized objects, and has been widely applied in physics, chemistry, biology, material, and colloidal science. Replacing the continuous-wave- with pulsed-mode laser in optical trapping has already revealed some novel phenomena, including the stable trap, modifiable trapping positions, and controllable directional optical ejections of particles in nanometer scales. Due to two distinctive features; impulsive peak powers and relaxation time between consecutive pulses, the optical trapping with the laser pulses has been demonstrated to have some advantages over conventional continuous-wave lasers, particularly when the particles are within Rayleigh approximation. This would open unprecedented opportunities in both fundamental science and application. This Review summarizes recent advances in the optical trapping with laser pulses and discusses the electromagnetic formulations and physical interpretations of the new phenomena. Its aim is rather to show how beautiful and promising this field will be, and to encourage the in-depth study of this field.
连续波激光的光阱技术是光学操控领域中一个引人入胜的研究方向。它已经成为操控微米级物体的强大工具，并广泛应用于物理、化学、生物、材料和胶体科学等领域。将连续波激光替换为脉冲激光进行光阱操作已经揭示了一些新的现象，包括稳定的陷阱、可调节的捕获位置以及在纳米尺度上可控的定向光喷射颗粒。由于脉冲激光具有脉冲峰值功率和连续脉冲之间的弛豫时间这两个独特的特性，与传统的连续波激光相比，脉冲激光的光阱技术具有一些优势，特别是在粒子处于瑞利近似范围内时。这将在基础科学和应用领域开辟前所未有的机遇。本文综述了激光脉冲光阱技术的最新进展，并讨论了新现象的电磁公式和物理解释。本文的目的主要是展示这个领域的美丽和广阔前景，并鼓励对该领域进行深入研究。
