2026-05-31T06:23:50Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/330942026-02-03T11:15:23Zcom_10630_2254col_10630_37953

Perfectly vertical surface grating couplers using subwavelength engineering for increased feature sizes. Kamandar Dezfouli, Mohsen Grinberg, Yuri Melati, Daniele Cheben, Pavel Schmid, Jens H. Sánchez-Postigo, Alejandro Ortega-Moñux, Alejandro Wanguemert-Pérez, Juan Gonzalo Cheriton, Ross Janz, Siegfried Xu, Dan-Xia Schmid, Jens H. Fotónica Óptica Optoelectrónica Política de acceso abierto tomada de: https://v2.sherpa.ac.uk/id/publication/13362 We present perfectly vertical grating couplers for the 220 nm silicon-on-insulator platform incorporating subwavelength metamaterials to increase the minimum feature sizes and achieve broadband low back-reflection. Our study reveals that devices with high coupling efficiencies are distributed over a wide region of the design space with varied back-reflections, while still maintaining minimum feature sizes larger than 100 nm and even 130 nm. Using 3D-finite-difference time-domain simulations, we demonstrate devices with broadband low back-reflection of less than -20dB over more than 100 nm bandwidth centered around the C-band. Coupling efficiencies of 72% and 67% are achieved for minimum feature sizes of 106 nm and 130 nm, respectively. These gratings are also more fabrication tolerant compared to similar designs not using metamaterials. 2024-09-24T16:40:53Z 2024-09-24T16:40:53Z 2020-06-29 journal article Mohsen Kamandar Dezfouli, Yuri Grinberg, Daniele Melati, Pavel Cheben, Jens H. Schmid, Alejandro Sánchez-Postigo, Alejandro Ortega-Moñux, Gonzalo Wangüemert-Pérez, Ross Cheriton, Siegfried Janz, and Dan-Xia Xu, "Perfectly vertical surface grating couplers using subwavelength engineering for increased feature sizes," Opt. Lett. 45, 3701-3704 (2020) https://hdl.handle.net/10630/33094 10.1364/OL.395292 eng open access Optica