Publications by Vahid Fakhfouri

Hybrid polymer microlens arrays with high numerical apertures fabricated using simple ink-jet printing technique

Vahid Fakhfouri, Dmitri Boiko, Jürgen Brugger, Edoardo Charbon, Nils Benedict Brauer, Joo Yeon Kim

Microlens arrays fabricated by a direct ink-jet printing of UV-curable hybrid polymer are reported. A periodic pattern of polymer drops was ink-jet printed on the surface-treated glass substrate and cured in the UV-light. Using this simple technique, we de ...

2011

Drop-on-demand inkjet printing of highly luminescent CdS and CdSe@ZnS nanocrystal based nanocomposites

Vahid Fakhfouri, Jürgen Brugger, Joo Yeon Kim

Inkjet printing technology is an emerging deposition method for the flexible and cost-effective dispensing of functional materials. In this work, luminescent single- and multi-colour pixel arrays of chloroform nanocomposite inks based on polystyrene (PS) f ...

2009

Inkjet-Printed Multicolor Arrays of Highly Luminescent Nanocrystal-Based Nanocomposites

Vahid Fakhfouri, Jürgen Brugger, Joo Yeon Kim

Inkjet technology is a compelling method for the flexible and cost-effective printing of functional inks. We show that nanocomposite solutions based on polystyrene and differently sized core/shell-type nanocrystals (NCs) formed by a CdSe core coated with a ...

2009

Direct Fabrication of Polymer Micro lens Arrays having Tunable Optical Properties using Drop-On-Demand Ink-Jet Printing Technology

Vahid Fakhfouri, Jürgen Brugger, Joo Yeon Kim

Ink-jet printing technique allows locally and precisely dispensing materials for the manufacturing of micro-scale structures. We present the fabrication of piano-convex microlenses using a hybrid organic-inorganic photo-curable polymer diluted in gamma-but ...

Soc Imaging Science & Technology, 7003 Kilworth Lane, Springfield, Va 22151 Usa2009

Drop-On-Demand Inkjet Printing of SU-8 Polymer

Alcherio Martinoli, Vahid Fakhfouri, Jürgen Brugger, Grégory Mermoud, Joo Yeon Kim

This paper presents drop-on-demand inkjet printing of SU-8 on functionalized surfaces for direct printing of computer controlled polymer patterns. The high viscosity of SU-8 required an in-depth investigation of the print parameters such as pulse amplitude ...

2009

Inkjet Printing of SU-8; A Case Study for Microlenses

Alcherio Martinoli, Vahid Fakhfouri, Dmitri Boiko, Jürgen Brugger, Edoardo Charbon, Grégory Mermoud, Nicolas Cantale, Joo Yeon Kim

This paper describes a novel method to fabricate polymer MEMS based on the inkjet printing of SU-8, with a special emphasis on integrated micro-optical lens arrays. Inkjet control parameters are optimized in order to enable a stable and reproducible ejecti ...

2008

Inkjet printing and high aspect ratio structuring for polymer-based micro and nano systems

Vahid Fakhfouri

Inkjet printing of functional materials, photolithography and micromolding are 3 different techniques largely used in the field of micro-electromechanical systems (MEMS) with increasing interest for the fabrication of new devices and the development of new ...

EPFL2008

Drop-on-demand Ink-jet printing of functional materials: Case studies of SU-8 and NCs-embedded Polymer nanocomposites

Vahid Fakhfouri, Jürgen Brugger, Joo Yeon Kim

2008

Inkjet printing of SU-8 for polymer-based MEMS a case study for microlenses

Vahid Fakhfouri, Jürgen Brugger, Edoardo Charbon, Grégory Mermoud, Joo Yeon Kim

This paper describes a novel method to fabricate polymer MEMS based on the inkjet printing of SU-8, with a special emphasis on integrated micro-optical lens arrays. Inkjet control parameters are optimized in order to enable a stable and reproducible ejecti ...

IEEE2008

Towards Smart Substrates for Controlling Micrometric Droplet Motion

Alcherio Martinoli, Vahid Fakhfouri, Jürgen Brugger, Grégory Mermoud

In this contribution, we describe a novel approach to the problem of setting micrometric droplets in motion. First, this paper reviews the state-of-the-art methods to enable millimetric droplet motion, and investigates the scalability of the most promising ...

2007

An Epoxy Photoresist Modified by Luminescent Nanocrystals for the Fabrication of 3D High-Aspect-Ratio Microstructures

Vahid Fakhfouri, Jürgen Brugger

An epoxy-based negative-tone photoresist, which is known as a suitable material for high-aspect-ratio surface micromachining, is functionalized with red-light-emitting CdSe@ZnS nanocrystals (NCs). The proper selection of a common solvent for the NCs and th ...

2007

Surface Micromachining of Polyureasilazane Based Ceramic-MEMS using SU-8 Micromolds

Vahid Fakhfouri, Sébastien Jiguet, Jürgen Brugger

We describe a novel surface micromachining process for the fabrication of ceramic-type MEMS devices, such as free-standing cantilevers, that is based on the use of high-aspect ratio micromolds of SU8 and aluminum as sacrificial layer. 250μm-high and 100-10 ...

2006