Jia Qiannan, Tang Renjie, Sun Xiaoyu, Tang Weiwei, Li Lan, Zhu Jiajie, Wang Pan, Yan Wei, Qiu Min
College of Information Science and Electronic Engineering, Zhejiang University, Hangzhou, Zhejiang Province, 310027, China.
Key Laboratory of 3D Micro/Nano Fabrication and Characterization of Zhejiang Province, School of Engineering, Westlake University, Hangzhou, Zhejiang Province, 310024, China.
Adv Sci (Weinh). 2024 Oct;11(39):e2401418. doi: 10.1002/advs.202401418. Epub 2024 Aug 19.
Actuation of micro-objects along unconstrained trajectories in van der Waals contacting systems-in the same capacity as optical tweezers to manipulate particles in fluidic environments-remains a formidable challenge due to the lack of effective methods to overcome and exploit surface friction. Herein, a technique that aims to resolve this difficulty is proposed. This study shows that, by utilizing a moderate power beam of light, micro-objects adhered on planar solid substrates can be precisely guided to move in arbitrary directions, realizing sub-nanometer resolution across extended surfaces. The underlying mechanism is the interplay between surface friction and pulsed opto-thermo-elastic deformations, and to render a biased motion with off-centroid light illumination. This technique enables high-precision assembly, separation control of nanogaps, regulation of rotation angles in various material-substrate systems, whose capability is further tested in reconfigurable construction of optoelectronic devices. With simple set-up and theoretical generality, opto-thermo-elastic actuation opens up an avenue for versatile optical manipulation in the solid domain.
在范德华接触系统中，沿无约束轨迹驱动微物体——其作用与光镊在流体环境中操纵粒子相同——由于缺乏有效方法来克服和利用表面摩擦力，仍然是一项艰巨的挑战。在此，提出了一种旨在解决这一难题的技术。本研究表明，通过利用中等功率光束，附着在平面固体基板上的微物体可以被精确引导向任意方向移动，在扩展表面上实现亚纳米级分辨率。其潜在机制是表面摩擦力与脉冲光热弹性变形之间的相互作用，以及通过离中心光照明实现偏向运动。该技术能够实现高精度组装、纳米间隙的分离控制、各种材料-基板系统中旋转角度的调节，其能力在光电器件的可重构构建中得到了进一步测试。光热弹性驱动设置简单且具有理论通用性，为固体领域的通用光学操纵开辟了一条途径。
