Artificial potential field-empowered dynamic holographic optical tweezers for particle-array assembly and transformation

Xing Li^{1, 2},
Yanlong Yang¹,
Shaohui Yan¹,
Wenyu Gao^{1, 2},
Yuan Zhou^{1, 2},
Xianghua Yu¹,
Chen Bai¹,
Dan Dan¹,
Xiaohao Xu¹,
Baoli Yao^{1, 2}

1.
State Key Laboratory of Transient Optics and Photonics, Xi’an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences, Xi’an, 710119, China
2.
University of Chinese Academy of Sciences, Beijing, 100049, China

Funds: This work was supported by the National Natural Science Foundation of China (12274181, 12127805, 62135005), the National Key Research and Development Program of China (2021YFF0700303, 2023YFF0613700), and Guangdong Basic and Applied Basic Research Foundation (2023A1515030143).

摘要

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Abstract: Owing to the ability to parallel manipulate micro-objects, dynamic holographic optical tweezers (HOTs) are widely used for assembly and patterning of particles or cells. However, for simultaneous control of large-scale targets, potential collisions could lead to defects in the formed patterns. Herein we introduce the artificial potential field (APF) to develop dynamic HOTs that enable collision-avoidance micro-manipulation. By eliminating collision risks among particles, this method can maximize the degree of parallelism in multi-particle transport, and it permits the implementation of the Hungarian algorithm for matching the particles with their target sites in a minimal pathway. In proof-of-concept experiments, we employ APF-empowered dynamic HOTs to achieve direct assembly of a defect-free 8 × 8 array of microbeads, which starts from random initial positions. We further demonstrate successive flexible transformations of a 7 × 7 microbead array, by regulating its tilt angle and inter-particle spacing distances with a minimalist path. We anticipate that the proposed method will become a versatile tool to open up new possibilities for parallel optical micromanipulation tasks in a variety of fields.

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