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Authors: X. Xue, E. Lievens, B. Berteloot, Y.-T. Hsiao, L. Van Iseghem, G.F. Feutmba, W. Bogaerts, K. Neyts, J. Beeckman
Title: Vertical Coupling between Waveguides and Optical Fibers Utilizing Polarization Gratings
Format: International Journal
Publication date: 3/2024
Journal/Conference/Book: IEEE Photonics Technology Letters
Volume(Issue): 36(5) p.309-312
DOI: 10.1109/LPT.2024.3352278
Citations: Look up on Google Scholar
Download: Download this Publication (1.3MB) (1.3MB)


We present how a conventional Si waveguide grating
coupler can be integrated with a polymerizable liquid crystal polarization grating to provide vertical coupling between optical fibers and planar waveguides. The implementation involves the deposition of a liquid crystal polymer film onto the surface of the planarized photonic chip. To achieve optimal performance, both the period and thickness of the thin film grating are optimized through a two-dimensional finite element simulation. The simulation results indicate that the output beam can be entirely redirected towards the vertical direction. We demonstrate a fabricated device and experimental validation of the proposed device in a laboratory setting. Through the verification, we affirm the feasibility of the proposed concept.

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