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

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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.
Original languageEnglish
Title of host publicationECIO 2022: 23rd European Conference on Integrated Optics
Subtitle of host publication4th May - 6th May, Milan, Italy
Place of PublicationMilan
PublisherPolitecnico di Milano
Publication statusPublished - 4 May 2022
Event23rd European Conference on Integrated Optics, ECIO 2022 - Milan, Italy
Duration: 4 May 20226 May 2022
Conference number: 23


Conference23rd European Conference on Integrated Optics, ECIO 2022
Abbreviated titleECIO


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