Mr. Tim Wolfer Profile

Tim Wolfer

Student at Leibniz Univ Hannover

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Publications (5)

SPIE Journal Paper | 27 October 2017

Improving partial wetting resolution on flexible substrates for application of polymer optical waveguides

Gerd-Albert Hoffmann, Tim Wolfer, Thomas Reitberger, Jörg Franke, Oliver Suttmann, Ludger Overmeyer

OE, Vol. 56, Issue 10, 103109, (October 2017) https://doi.org/10.1117/12.10.1117/1.OE.56.10.103109

KEYWORDS: Waveguides, Printing, Polymers, Polymer multimode waveguides, Nonimpact printing, Laser applications, Signal attenuation, Data communications, Telecommunications, Image processing

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Proceedings Article | 20 February 2017 Presentation + Paper

Manufacturing of polymer optical waveguides using self-assembly effect on pre-conditioned 3D-thermoformed flexible substrates

Gerd-Albert Hoffmann, Tim Wolfer, Jochen Zeitler, Jörg Franke, Oliver Suttmann, Ludger Overmeyer

Proceedings Volume 10115, 1011503 (2017) https://doi.org/10.1117/12.2249121

KEYWORDS: Waveguides, Polymers, Optics manufacturing, Polymer multimode waveguides, Printing, Data transmission, Packaging, Data communications, Micro optics, Microfluidics, Coating, Liquids, Polymer thin films, Glasses

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SPIE Journal Paper | 26 October 2016

Ink-jet printed fluorescent materials as light sources for planar optical waveguides on polymer foils

Patrick Bollgruen, Uwe Gleissner, Tim Wolfer, Christof Megnin, Dario Mager, Ludger Overmeyer, Jan Korvink, Thomas Hanemann

OE, Vol. 55, Issue 10, 107107, (October 2016) https://doi.org/10.1117/12.10.1117/1.OE.55.10.107107

KEYWORDS: Waveguides, Light sources, Polymers, Printing, Fluorescent materials, Polymer multimode waveguides, Refractive index, Additive manufacturing, Sensors, Luminescence

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Proceedings Article | 27 September 2016 Presentation + Paper

Printing polymer optical waveguides on conditioned transparent flexible foils by using the aerosol jet technology

Thomas Reitberger, Gerd-Albert Hoffmann, Tim Wolfer, Ludger Overmeyer, Joerg Franke

Proceedings Volume 9945, 99450G (2016) https://doi.org/10.1117/12.2236220

KEYWORDS: Polymers, Printing, Waveguides, Aerosols, Liquids, Polymer multimode waveguides, Copper, Polymethylmethacrylate, Cladding, Inkjet technology

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Proceedings Article | 13 May 2016 Paper

Optical coupling of bare optoelectronic components and flexographically printed polymer waveguides in planar optronic systems

Yixiao Wang, Tim Wolfer, Alex Lange, Ludger Overmeyer

Proceedings Volume 9891, 989103 (2016) https://doi.org/10.1117/12.2227340

KEYWORDS: Polymers, Polymer multimode waveguides, Semiconductor lasers, Polymeric sensors, Waveguides, Polymer multimode waveguides, Optoelectronics, Optical simulations, Optical alignment, Printing, Polymethylmethacrylate

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Large scale, planar optronic systems allowing spatially distributed functionalities can be well used in diverse sensor networks, such as for monitoring the environment by measuring various physical quantities in medicine or aeronautics. In these systems, mechanically flexible and optically transparent polymeric foils, e.g. polymethyl methacrylate (PMMA) and polyethylene terephthalate (PET), are employed as carrier materials. A benefit of using these materials is their low cost. The optical interconnections from light sources to light transmission structures in planar optronic systems occupy a pivotal position for the sensing functions. As light sources, we employ the optoelectronic components, such as edgeemitting laser diodes, in form of bare chips, since their extremely small structures facilitate a high integration compactness and ensure sufficient system flexibility. Flexographically printed polymer optical waveguides are deployed as light guiding structures for short-distance communication in planar optronic systems. Printing processes are utilized for this generation of waveguides to achieve a cost-efficient large scale and high-throughput production. In order to attain a high-functional optronic system for sensing applications, one of the most essential prerequisites is the high coupling efficiency between the light sources and the waveguides. Therefore, in this work, we focus on the multimode polymer waveguide with a parabolic cross-section and investigate its optical coupling with the bare laser diode. We establish the geometrical model of the alignment based on the previous works on the optodic bonding of bare laser diodes and the fabrication process of polymer waveguides with consideration of various parameters, such as the beam profile of the laser diode, the employed polymer properties of the waveguides as well as the carrier substrates etc. Accordingly, the optical coupling of the bare laser diodes and the polymer waveguides was simulated. Additionally, we demonstrate optical links by adopting the aforementioned processes used for defining the simulation. We verify the feasibility of the developed processes for planar optronic systems by using an active alignment and conduct discussions for further improvements of optical alignment.

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