Opto-thermoelectric pulling of light-absorbing particles
Opto-thermoelectric pulling of light-absorbing particles
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DOI：
10.1038/s41377-020-0271-6
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发表时间：
2020-03-06
影响因子：
19.4
通讯作者：
Zheng, Yuebing
中科院分区：
文献类型：
--
作者：
Lin, Linhan;Kollipara, Pavana Siddhartha;Zheng, Yuebing
光力学源于光子动量及其与低维物体的交换。众所周知，光辐射会对物体施加压力，沿光路推动它们。然而，物体逆着光路被光拉动仍然是一种违反直觉的现象。在此，我们提出一种光拉动的一般概念——光热电拉动（OTEP），即使用简单平面波对光吸收粒子进行光加热能够使粒子自身逆着光路被拉动。这种由照射方向决定的拉力赋予粒子自恢复行为，并且在10⁻²毫瓦每平方微米的极低光强下实现了对单个粒子的三维（3D）捕获。此外，OTEP力能够克服传统光镊的短捕获范围，并在宏观距离上光学驱动粒子流。自诱导光热机械耦合的概念为自由形式的光流体技术和芯片实验室设备铺平了道路。
光拉动：光能够逆着流移动粒子
在一种被称为光热电拉动（OTEP）的现象中，由于吸收简单平面光波而导致的粒子光加热能够使粒子逆着光路方向被拉动。美国德克萨斯大学奥斯汀分校的林翰林、郑跃兵及其同事通过操纵500纳米的硅粒子展示了这种违反直觉的概念。作者提出了一种机制，使得光加热的效应能够对抗并克服光束方向上的光力。他们解释了如何通过操纵光子能量与目标粒子的相互作用来实现这一点。这种现象能够使用极低的光强捕获和移动粒子。基于光与流体（光流体学）相互作用存在潜在应用，特别是在芯片实验室设备中。
Optomechanics arises from the photon momentum and its exchange with low-dimensional objects. It is well known that optical radiation exerts pressure on objects, pushing them along the light path. However, optical pulling of an object against the light path is still a counter-intuitive phenomenon. Herein, we present a general concept of optical pulling-opto-thermoelectric pulling (OTEP)-where the optical heating of a light-absorbing particle using a simple plane wave can pull the particle itself against the light path. This irradiation orientation-directed pulling force imparts self-restoring behaviour to the particles, and three-dimensional (3D) trapping of single particles is achieved at an extremely low optical intensity of 10(-2) mW mu m(-2). Moreover, the OTEP force can overcome the short trapping range of conventional optical tweezers and optically drive the particle flow up to a macroscopic distance. The concept of self-induced opto-thermomechanical coupling is paving the way towards freeform optofluidic technology and lab-on-a-chip devices.Optical pulling: Light can move particles against the stream In a phenomenon termed opto-thermoelectric pulling (OTEP), the optical heating of a particle due to the absorption of a simple plane light wave can pull the particle against the direction of the light path. Linhan Lin, Yuebing Zheng and colleagues at the University of Texas at Austin, USA, demonstrate this counter-intuitive concept by manipulating particles of silicon 500 namometers across. The authors propose a mechanism allowing the effect of optical heating to oppose and overcome the optical force in the direction of the light beam. They explain how this can be achieved by manipulating the interaction of the energy of photons with the target particles. The phenomenon can trap and move particles using extremely low optical intensities. There are potential applications based on the interaction of light with fluids (optofluidics) especially in lab-on-a-chip devices.