Dr. Aaron T. Ohta Profile

Dr. Aaron T. Ohta

at Univ of Hawaii at Manoa

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Proceedings Article | 18 June 2015 Paper

Automated actuation of multiple bubble microrobots using computer-generated holograms

M. Arifur Rahman, Julian Cheng, Qihui Fan, Aaron Ohta

Proceedings Volume 9494, 94940G (2015) https://doi.org/10.1117/12.2183258

KEYWORDS: Control systems, Spatial light modulators, Holograms, Holography, Computer generated holography, Optical tweezers, Automatic control, Microfluidics, Human-machine interfaces, Laser applications

Read Abstract +

Microrobots, sub-millimeter untethered microactuators, have applications including cellular manipulation, microsurgery, microassembly, tissue culture, and drug delivery. Laser-induced opto-thermocapillary flow-addressed bubble (OFB) microrobots are promising for these applications. In the OFB microrobot system, laser patterns generate thermal gradients within a liquid media, creating thermocapillary forces that actuate the air bubbles that serve as microrobots. A unique feature of the OFB microrobot system is that the optical control enables the parallel yet independent actuation of microrobots. This paper reports on the development of an automated control system for the independent addressing of many OFB microrobots in parallel. In this system, a spatial light modulator (SLM) displayed computer-generated holograms to create an optical pattern consisting of up to 50 individual spots. Each spot can control a single microrobot, so the control of array of microrobots was accomplished with sequence of holograms. Using the control system described in this paper, single, multiple, and groups of microrobots were created, repositioned, and maneuvered independently within a set workspace. Up to 12 microrobots were controlled independently and in parallel. To the best knowledge of the authors, this is the largest number of parallel, independent microrobot actuation reported to date.

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