Miniature Photo-Driven Microbubble Capture Actuator Based on Optical Fiber Microcavity

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Microfluidics

Background:

• Micronano capture systems are crucial for biomedical engineering, lab-on-a-chip devices, and targeted drug delivery.
• Efficient trapping of target particles remains a key challenge in these fields.

Purpose of the Study:

• To propose and demonstrate a novel miniature photodriven microbubble capture actuator.
• To utilize an optical fiber microcavity and a photothermal composite film for particle capture.

Main Methods:

• Fabrication of a composite film using graphene oxide, polydimethylsiloxane, and gold nanobipyramids (GO/PDMS-AuNBPs).
• Integration of the composite film with an optical fiber microcavity to create the actuator.
• Induction of a temperature gradient via photothermal conversion to generate a surface tension gradient for bubble manipulation.

Main Results:

• The actuator successfully captured microbubbles with radii ranging from 5 to 200 μm.
• High photothermal conversion efficiency of the GO/PDMS-AuNBPs film was confirmed.
• The system demonstrated stable operation and effective microbubble trapping in liquid environments.

Conclusions:

• The proposed photodriven microbubble capture actuator offers a novel and efficient method for particle manipulation.
• Advantages include low power consumption, compact design, and high stability.
• The system presents a promising platform for advanced biomedical applications, including live cell manipulation and microreactor construction.