2026-05-30T05:47:34Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/341702026-02-03T10:59:07Zcom_10630_2254col_10630_37953

An ultracompact GRIN lens based spot size converter using subwavelength grating metamaterials Luque-González, José Manuel Halir, Robert Wanguemert-Pérez, Juan Gonzalo De-Oliva-Rubio, José Schmid, Jens H. Cheben, Pavel Molina-Fernández, Íñigo Ortega-Moñux, Alejandro Metamateriales Luz - Propagación Fotones Graded-index materials offer virtually complete control over light propagation in integrated photonic chips but can be challenging to implement. Here, an anisotropic graded-index metamaterial, synthesized with fully etched silicon subwavelength structures, is proposed. Based on this material, a spot size converter that expands the transverse electric (TE) mode field profile from a 0.5 µm wide silicon wire waveguide to a 15 µm wide waveguide within a length of only 14 µm is designed. Measured insertion losses are below 1 dB in an unprecedented 130 nm bandwidth, limited by the measurement setup, with full 3D finite-difference time-domain (FDTD) simulations predicting a bandwidth in excess of 300 nm. Furthermore, the device is well suited to feed fiber-to-chip grating couplers, while requiring a footprint ten times smaller than conventional adiabatic tapers. 2024-10-02T08:08:20Z 2024-10-02T08:08:20Z 2024-10-02T08:08:20Z 2019 journal article J. M. Luque-González, R. Halir, J. G. Wangüemert-Pérez, J. de-Oliva-Rubio, J. H. Schmid, P. Cheben, Í. Molina-Fernández, A. Ortega-Moñux. (2019). An Ultracompact GRIN-Lens-Based Spot Size Converter using Subwavelength Grating Metamaterials. Laser & Photonics Reviews, 13 (11), 1900172. https://doi.org/10.1002/lpor.201900172 https://hdl.handle.net/10630/34170 https://doi.org/10.1002/lpor.201900172 eng http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional Wiely