We propose a new and versatile way for optical orbital rotation of microscopic sized multi-particle arrays in a transversely misaligned dual-fiber optical trap. A PDMS(Polydimethylsiloxane) chip is designed to adjust the transverse offset distance between two fibers. It is possible to control the orbital rotation frequency and perimeter by varying the transverse offset distance without external influences. Experimental results show that there is a threshold value, beyond which the particles will rotate in a certain trajectory. The threshold values of the transverse offset required to initiate orbital rotation was found to be different for different number particle arrays. The proposed optical manipulation technique has been verified to be useful for cell sorting, optical binding and assembly of microstructures.
Design a chip for flexible multifunction optical micro-manipulation based on elastomeric materials-PDMS. We realized the different motion types of microspheres, including stably capture, spiral motion and orbital rotation, by adjusting the input voltage of piezoceramics designed in PDMS Chip. Compared to conventional techniques, this PDMS chip based method does not require special optical properties of the microspheres to be manipulated. In addition, the technique was convenient and precise for dynamical adjustment of motion types without external influences. From these results, we verify that this multifunctional optical micro-manipulation technique of PDMS elastomeric materials can find potential applications for optical manipulation, including cost-effective on-chip diagnostics, optical sorting and optical binding, etc.
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