Academic Bibliography
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Ghent University Academic Bibliography2000-01-01T00:00+00:001monthlyVertical coupling between waveguides and optical fibers utilizing polarization gratings
https://biblio.ugent.be/publication/01HM66Q8SRYHQAPSAYVRRTE1H7
Xue, XiangyuLievens, EnesBerteloot, BrechtHsiao, Yu-TungVan Iseghem, LukasFeutmba, Gilles FreddyBogaerts, WimNeyts, KristiaanBeeckman, Jeroen2024We 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.application/pdfhttps://biblio.ugent.be/publication/01HM66Q8SRYHQAPSAYVRRTE1H7http://hdl.handle.net/1854/LU-01HM66Q8SRYHQAPSAYVRRTE1H7http://doi.org/10.1109/lpt.2024.3352278https://biblio.ugent.be/publication/01HM66Q8SRYHQAPSAYVRRTE1H7/file/01HM672X4FFJ85J68FNB889BWNengNo license (in copyright)info:eu-repo/semantics/openAccessIEEE PHOTONICS TECHNOLOGY LETTERSISSN: 1041-1135ISSN: 1941-0174Technology and EngineeringElectrical and Electronic EngineeringAtomic and Molecular Physics, and OpticsElectronic, Optical and Magnetic Materialsliquid crystal polymerpolarization gratingvertical couplinghigh-contrast waveguidesGrating couplerOptical fiber couplersOptical fiber polarizationOptical waveguidesPolymersCouplingsCouplersGratingsVertical coupling between waveguides and optical fibers utilizing polarization gratingsjournalArticleinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionOptical leaky fin waveguide for long-range optical antennas on high-index contrast photonic circuit platforms
https://biblio.ugent.be/publication/01H9321JAQP5JMTCEZDK48DP89
Van Iseghem, LukasBogaerts, Wim2023Long-distance light detection and ranging (LiDAR) applications require an aperture size in the order of 30 mm to project 200–300 m. To generate such collimated Gaussian beams from the surface of a chip, this work presents a novel waveguide antenna concept, which we call an “optical leaky fin antenna,” consisting of a tapered waveguide with a narrow vertical “fin” on top. The proposed structure (operating around 𝜆=1.55 μm) overcomes fundamental fabrication challenges encountered in weak apodized gratings, the conventional method to create an off-chip wide Gaussian beam from a waveguide chip. We explore the design space of the antenna by scanning the relevant cross section parameters in a mode solver, and their sensitivity is examined. We also investigate the dispersion of the emission pattern and angle with the wavelength. The simulated design space is then used to construct and simulate an optical antenna to emit a collimated target intensity profile. Results show inherent robustness to crucial design parameters and indicate good scalability of the design. Possibilities and challenges to fabricate this device concept are also discussed. This novel antenna concept illustrates the possibility to integrate long optical antennas required for long-range solid-state LiDAR systems on a high-index contrast platform with a scalable fabrication method.application/pdfhttps://biblio.ugent.be/publication/01H9321JAQP5JMTCEZDK48DP89http://hdl.handle.net/1854/LU-01H9321JAQP5JMTCEZDK48DP89http://doi.org/10.1364/prj.490085https://biblio.ugent.be/publication/01H9321JAQP5JMTCEZDK48DP89/file/01H9327057JHMSSFDS5ST4M1BKengNo license (in copyright)info:eu-repo/semantics/restrictedAccessPHOTONICS RESEARCHISSN: 2327-9125Technology and EngineeringAtomic and Molecular Physics, and OpticsElectronic, Optical and Magnetic MaterialsOptical leaky fin waveguide for long-range optical antennas on high-index contrast photonic circuit platformsjournalArticleinfo:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersion