RT Journal Article
T1 Suspended germanium waveguides with subwavelength-grating metamaterial cladding for the mid-infrared band.
A1 Sánchez-Postigo, Alejandro
A1 Ortega-Moñux, Alejandro
A1 Soler Penadés, Jordi
A1 Osman, Ahmed
A1 Nedeljkovic, Milos
A1 Qu, Zhibo
A1 Wu, Yangbo
A1 Molina-Fernández, Íñigo
A1 Cheben, Pavel
A1 Mashanovich, Goran Z
A1 Wangüemert-Pérez, J Gonzalo
AB 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.
YR 2021
FD 2021
LK http://hdl.handle.net/10668/18030
UL http://hdl.handle.net/10668/18030
LA en
DS RISalud
RD Apr 12, 2025