International Journal of Extreme Manufacturing, Volume. 3, Issue 2, 25001(2021)

Encryption/decryption and microtarget capturing by pH-driven Janus microstructures fabricated by the same femtosecond laser printing parameters

Zhaoxin Lao1,2, Rui Sun3, Dongdong Jin1, Zhongguo Ren2, Chen Xin2, Yachao Zhang2, Shaojun Jiang2, Yiyuan Zhang2, and Li Zhang1、*
Author Affiliations
  • 1Department of Mechanical and Automation Engineering, The Chinese University of Hong Kong,Sha Tin, Hong Kong, People’s Republic of China
  • 2CAS Key Laboratory of Mechanical Behavior and Design of Materials, Key Laboratory of Precision Scientific Instrumentation of Anhui Higher Education Institutes, Department of Precision Machinery and Precision Instrumentation, University of Science and Technology of China, Hefei, Anhui 230027, People’s Republic of China
  • 3Chengdu Fine Optical Engineering Research Center, Chengdu 610041, People’s Republic of China
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    Several natural organism can change shape under external stimuli. These natural phenomena have inspired a vast amount of research on exploration and implementation of reconfigurable shape transformation. The Janus structure is a promising approach to achieve shape transformation based on its heterogeneous chemical or physical properties on opposite sides. However, the heterogeneity is generally realized by multi-step processing, different materials, and/or different processing parameters. Here, we present a simple and flexible method of producing pH-sensitive Janus microactuators from a single material, using the same laser printing parameters. These microactuators exhibit reversible structural deformations with large bending angles of ~31° and fast response (~0.2 s) by changing the pH value of the aqueous environment. Benefited from the high flexibility of the laser printing technique and the spatial arrangements, pillar heights, and bending directions of microactuators are readily controlled, enabling a variety of switchable ordered patterns and complex petal-like structures on flat surfaces and inside microchannels. Finally, we explore the potential applications of this method in information encryption/decryption and microtarget capturing. Supplementary material for this article is available online


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    Zhaoxin Lao, Rui Sun, Dongdong Jin, Zhongguo Ren, Chen Xin, Yachao Zhang, Shaojun Jiang, Yiyuan Zhang, Li Zhang. Encryption/decryption and microtarget capturing by pH-driven Janus microstructures fabricated by the same femtosecond laser printing parameters[J]. International Journal of Extreme Manufacturing, 2021, 3(2): 25001

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    Paper Information


    Received: Sep. 8, 2020

    Accepted: --

    Published Online: Jan. 10, 2022

    The Author Email: Zhang Li (



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