2026-06-02T14:39:59Zhttps://riuma.uma.es/rest/oai/request

oai:riuma.uma.es:10630/336232026-02-03T11:02:19Zcom_10630_2254col_10630_37953

Sánchez-Postigo, Alejandro Ortega-Moñux, Alejandro Soler Penadés, Jordi Osman, Ahmed Nedeljkovic, Milos Qu, Zhibo Wu, Yangbo Molina-Fernández, Íñigo Cheben, Pavel Mashanovich, Goran Z. Wanguemert-Pérez, Juan Gonzalo 2024-09-27T09:19:57Z 2024-09-27T09:19:57Z 2021-05-24 Alejandro Sánchez-Postigo, Alejandro Ortega-Moñux, Jordi Soler Penadés, Ahmed Osman, Milos Nedeljkovic, Zhibo Qu, Yangbo Wu, Íñigo Molina-Fernández, Pavel Cheben, Goran Z. Mashanovich, and J. Gonzalo Wangüemert-Pérez, "Suspended germanium waveguides with subwavelength-grating metamaterial cladding for the mid-infrared band," Opt. Express 29, 16867-16878 (2021) https://hdl.handle.net/10630/33623 https://doi.org/10.1364/OE.422764 In recent years, sensing and communication applications have fueled important developments of group-IV photonics in the mid-infrared band. In the long-wave range, most platforms are based on germanium, which is transparent up to ∼15-µm wavelength. However, those platforms are limited by the intrinsic losses of complementary materials or require complex fabrication processes. To overcome these limitations, we propose suspended germanium waveguides with a subwavelength metamaterial lateral cladding that simultaneously provides optical confinement and allows structural suspension. These all-germanium waveguides can be fabricated in one dry and one wet etch step. A propagation loss of 5.3 dB/cm is measured at a wavelength of 7.7 µm. These results open the door for the development of integrated devices that can be fabricated in a simple manner and can potentially cover the mid-infrared band up to ∼15 µm. eng http://creativecommons.org/licenses/by/4.0/ open access Atribución 4.0 Internacional Rayos infrarrojos Suspended germanium waveguides with subwavelength-grating metamaterial cladding for the mid-infrared band journal article