University of Twente Student Theses


3D printed on-chip parabolic mirror for chip-to-fiber and chip-to-chip coupling

Kong, Yujia (2022) 3D printed on-chip parabolic mirror for chip-to-fiber and chip-to-chip coupling.

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Abstract:Reflection of light by a 3D printed parabolic mirror overcomes the in-plane limitation of end facet coupling between two photonic devices (such as on-chip waveguides, optical fibers). With a 3D printed parabolic mirror, light can leave the wafer-plane. This enables wafer-level optical testing, where we can identify problematic devices easily and do not need to waste assembly on them. Furthermore, with the proper curvature design, the mirrors generate a bigger beam waist than the mode sizes at the waveguide end facet, which reduces requirements on the alignment accuracy[1]. Depending on the reflection coating, a parabolic mirror can work over a very large wavelength range (e.g. from the UV to the infrared for an Al coating) compared to a grating coupler, which typically spans only a few tens of nano-meters[2]. In this study, a parabolic mirror base is 3D printed using a 3D-Nanoscribe two-photon polymerization printer. The reflection layer is formed by Al coating. Details of the design, fabrication, and preliminary characterization of the mirrors will be presented.
Item Type:Essay (Master)
Faculty:EEMCS: Electrical Engineering, Mathematics and Computer Science
Programme:Electrical Engineering MSc (60353)
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