2026-05-29T23:15:24Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/335462026-02-03T11:25:23Zcom_10630_2254col_10630_37953

Breaking the Coupling Efficiency–Bandwidth Trade-Off in Surface Grating Couplers Using Zero-Order Radiation Sánchez-Postigo, Alejandro Halir, Robert Wanguemert-Pérez, Juan Gonzalo Ortega-Moñux, Alejandro Wang, Shurui Vachon, Martin Schmid, Jens H. Xu, Dan-Xia Cheben, Pavel Molina-Fernández, Íñigo Circuitos fotónicos Silicon photonics provides wafer-scale fabrication of densely integrated photonic circuits that are enabling breakthrough applications in datacom, artificial intelligence, and healthcare. The sub-micrometer mode size of silicon waveguides makes efficient coupling to conventional single mode fibers extremely challenging. While advanced surface grating couplers can achieve sub-decibel coupling efficiencies, their operation relies on diffraction phenomena, which intrinsically limit the operational bandwidth. Here a novel type of surface coupler is experimentally demonstrated that overcomes the efficiency-bandwidth limitation of conventional diffraction gratings by harnessing zero-order radiation from a subwavelength metamaterial waveguide to a tilted silicon prism. The device achieves a coupling efficiency above 80% to an SMF-28 fiber in a record 1-dB bandwidth beyond 90 nm, opening new venues for highly efficient broadband fiber-to-chip surface coupling in silicon photonics. 2024-09-26T18:21:32Z 2024-09-26T18:21:32Z 2021-05-05 journal article A. Sánchez-Postigo, R. Halir, J. G. Wangüemert-Pérez, A. Ortega-Moñux, S. Wang, M. Vachon, J. H. Schmid, D.-X. Xu, P. Cheben, Í. Molina-Fernández, Breaking the Coupling Efficiency–Bandwidth Trade-Off in Surface Grating Couplers Using Zero-Order Radiation. Laser & Photonics Reviews 2021, 15, 2000542. https://doi.org/10.1002/lpor.202000542 https://hdl.handle.net/10630/33546 10.1002/lpor.202000542 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Wiley