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Femtosecond laser material processing for micro-/nano-scale fabrication and biomedical applications

Choi, Hae Woon
http://rave.ohiolink.edu/etdc/view?acc_num=osu1184883900

Abstract Details

2007, Doctor of Philosophy, Ohio State University, Welding Engineering.
Femtosecond laser ablation has interesting characteristics for micromachining, notably non-thermal interaction with materials, high peak intensity, precision and flexibility. In this dissertation, the potential of femtosecond laser ablation for fabrication of biomedical and electronic devices is studied. In a preliminary background discussion, some key literature regarding the basic physics and mechanisms that govern ultrafast laser pulse interaction with conductive materials and dielectric materials are summarized. In the dissertation work, results from systematic experiments were used characterize laser ablation of ITO (Indium Tin Oxide), stainless steel (hot embossing applications), polymers (PMMA, PDMS, PET, and PCL), glass, and fused quartz. Measured parameters and results include ablation threshold, damage threshold, surface roughness, single- and multiple-pulse ablation shapes and ablation efficiency. In addition to solid material, femtosecond laser light interaction with electrospun nano-fiber fiber mesh was analyzed and studied by optical property measurements. Ablation of channels in nano-fiber mesh was studied experimentally. Internal channel fabrication in glass and PMMA polymers was also demonstrated and studied experimentally. In summary, it is concluded that femtosecond laser ablation is a useful process for micromachining of materials to produce microfluidic channels commonly needed in biomedical devices such as micro-molecular magnetic separators and DNA stretching micro arrays. The surface roughness of ablated materials was found to be the primary issue for femtosecond laser fabrication of microfluid channels. Improved surface quality of channels by surface coating with HEMA polymer was demonstrated.
Dave Farson (Advisor)
232 p.
Engineering, Mechanical
femtosecond laser; ultrashort; micromachining; microfluidic

Recommended Citations

Citations

  • Choi, H. W. (2007). Femtosecond laser material processing for micro-/nano-scale fabrication and biomedical applications [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1184883900

    APA Style (7th edition)

  • Choi, Hae Woon. Femtosecond laser material processing for micro-/nano-scale fabrication and biomedical applications. 2007. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1184883900.

    MLA Style (8th edition)

  • Choi, Hae Woon. "Femtosecond laser material processing for micro-/nano-scale fabrication and biomedical applications." Doctoral dissertation, Ohio State University, 2007. http://rave.ohiolink.edu/etdc/view?acc_num=osu1184883900

    Chicago Manual of Style (17th edition)

osu1184883900
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© 2007, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.