Publication

Laser-induced forward transfer of functional SU-8 microparts

Giovanni Boero
2021
Talks

Abstract

We have developed a robust and universal method to transfer functionalized SU-8 microparts with metallic patterns by laser-induced forward transfer (LIFT) technique. To overcome the difficulty of metal patterning on high-aspect ratio SU-8 microparts on the donor substrate, we utilize a stencil lithography method. The influence of laser energy and SU-8 thickness on the micropart transfer result is systematically studied, and we find the optimized parameter combination to guarantee damage-free transfer. Various transfer examples are displayed to prove that LIFT can not only non-destructively transfer SU-8 functional microparts, but also preserve the functionality after the transfer.

Official source

https://infoscience.epfl.ch/entities/publication/b3e612c1-0cfe-4036-8e53-2265fcd8c911

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Giovanni Boero
2021
Talks

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/b3e612c1-0cfe-4036-8e53-2265fcd8c911

About this result

Related concepts (15)

Laser diode

A laser diode (LD, also injection laser diode or ILD, or diode laser) is a semiconductor device similar to a light-emitting diode in which a diode pumped directly with electrical current can create lasing conditions at the diode's junction. Driven by voltage, the doped p–n-transition allows for recombination of an electron with a hole. Due to the drop of the electron from a higher energy level to a lower one, radiation, in the form of an emitted photon is generated. This is spontaneous emission.

Heat transfer

Heat transfer is a discipline of thermal engineering that concerns the generation, use, conversion, and exchange of thermal energy (heat) between physical systems. Heat transfer is classified into various mechanisms, such as thermal conduction, thermal convection, thermal radiation, and transfer of energy by phase changes. Engineers also consider the transfer of mass of differing chemical species (mass transfer in the form of advection), either cold or hot, to achieve heat transfer.

Laser

A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The word laser is an anacronym that originated as an acronym for light amplification by stimulated emission of radiation. The first laser was built in 1960 by Theodore Maiman at Hughes Research Laboratories, based on theoretical work by Charles H. Townes and Arthur Leonard Schawlow. A laser differs from other sources of light in that it emits light that is coherent.

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Laser-induced forward transfer of functional SU-8 microparts

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