| 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
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Abstract
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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