In this paper we will discuss various aspects of surface engineering. This is a broad term, and we choose to focus on two
aspects thereof, namely surface texturing on the micron scale using laser micromachining, and chemical modification of
the surface using molecular vapour deposition (MVD). First, we will discuss the basics of laser texturing, followed by a
brief review of contact angle theory. We will then demonstrate how to obtain superhydrophobic surfaces on any kind of
material using a combined laser and MVD process. Finally, we will present a few recent industrial cases.
The laser micromachining activities at the DTI have been going on since 2002. Here, we provide a review of the development of our laser laboratory including our recent investment in a femtosecond laser facility. In-depth information about the capabilities of this facility compared to the other lasers will be given. Finally, several industrially relevant case stories will be presented.
The laser micromachining activities at the DTI have been going on since 2002. Here, we provide a review of the development of our laser laboratory including our recent investment in a femtosecond laser facility. In-depth information about the capabilities of this facility compared to the other lasers will be given. Finally, several industrially relevant case stories will be presented.
We present a new method to manufacture arrays of microlenses with varying diameter and/or varying focal length on the same substrate material. The method combines direct laser machining with a casting method and is based on the exposure of poly-methylmethacrylate (PMMA) to an UV Excimer Laser (248 nm). A following thermal treatment of the PMMA results in spherical caps in the PMMA which subsequently serves as a mould to replicate inverse structures in poly-dimethylsiloxane (PDMS) by casting. Lenses with a focal length of 300 µm to 4,000 µm have been realized in a PDMS replicate from the PMMA, however, this method is not limited to these materials if the soft embossing technology is applied where an elastomer such as PDMS serves as the mould.
Conference Committee Involvement (2)
Laser-based Micro- and Nanopackaging and Assembly III
28 January 2009 | San Jose, California, United States
Laser-Based Micro- and Nano-Packaging and Assembly II
22 January 2008 | San Jose, California, United States
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