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Water-assisted femtosecond laser ablation for fabricating three-dimensional microfluidic chips
Yan Li,Shiliang Qu 한국물리학회 2013 Current Applied Physics Vol.13 No.7
When the femtosecond laser focused in the water, the breakdown will be induced. The generated highspeed jet and shock wave can be used to etch silica glass for fabricating three-dimensional (3D)microfluidic chips. We present a simple and practical method to produce 3D multilayer microfluidic chips in silica glass. This method offers high design flexibility and fabricating feasibility. We also introduce a convenient cleaning method for diluting and ejecting the ablated debris from microchannel. Therefore, the femtosecond laser induced high-speed jet and shock wave can be used to fabricate complex microfluidic chips in silica glass. Experimental results show that the diameter of microchannel is uniform and the complexity of the microfluidic chip is under control. As a proof of principle, we demonstrate the feasibility of the fabricating process by using the water-assisted femtosecond laser ablation.
Self-assembled volume vortex grating induced by femtosecond laser pulses in glass
Lingling Ran,Shiliang Qu 한국물리학회 2009 Current Applied Physics Vol.9 No.6
We presented a microfabrication process for optical volume vortex grating inside glass by femtosecond laser pulses. The self-trapped filament of femtosecond laser pulses can induce hundreds ㎛-long region refractive-index changes in glass. We realized the restructured optical vortex beams using a collimated He–Ne laser beam. The maximum first-order diffraction efficiency was about 19.6%. The volume vortex grating structure fabricated in glass is polarization dependent. We presented a microfabrication process for optical volume vortex grating inside glass by femtosecond laser pulses. The self-trapped filament of femtosecond laser pulses can induce hundreds ㎛-long region refractive-index changes in glass. We realized the restructured optical vortex beams using a collimated He–Ne laser beam. The maximum first-order diffraction efficiency was about 19.6%. The volume vortex grating structure fabricated in glass is polarization dependent.
Fabrication of polymer compound microlens by lens-on-lens microstructures
Zehua Xia,Yan Li,Xiaoya Su,Yanhua Han,Zhongyi Guo,Jian-Min Gao,Qiaoqun Sun,Shiliang Qu 한국물리학회 2017 Current Applied Physics Vol.17 No.1
We proposed a novel method for fabricating polymer compound microlenses (PCMLs) using micro-inkjet technique and subsequent curing process. Two different types of PCMLs with sandwich microstructure (PDMS-Glycerol-PDMS), concave and convex PCMLs, have been designed and fabricated in experiments. Convex PCML has two real images and two foci. The concave PCML has one real and one virtual focal planes, which can generate one real image and one virtual image respectively. Moreover, the diameter of concave PCML can be controlled by adjusting the curing time and temperature. The proposed method is simple, efficient and suitable for realizing large-scale high numerical aperture PCMLs array, which has potential applications in diverse optical systems such as optical storage and three-dimensional imaging.