RT Journal Article
T1 Disorder effects in subwavelength grating metamaterial waveguides.
A1 Ortega-Moñux, Alejandro
A1 Čtyroký, Jiří
A1 Cheben, Pavel
A1 Schmid, Jens H
A1 Wang, Shurui
A1 Molina-Fernández, Íñigo
A1 Halir, Robert
AB Subwavelength grating (SWG) waveguides are integrated photonic structures with a pitch substantially smaller than wavelength for which they are designed, so that diffraction effects are suppressed. SWG operates as an artificial metamaterial with an equivalent refractive index which depends on the geometry of the structure and the polarization of the propagating wave. SWG waveguides have been advantageously used in silicon photonics, resulting in significant performance improvements for many practical devices, including highly efficient fiber-chip couplers, waveguide crossings, broadband multimode interference (MMI) couplers, evanescent field sensors and polarization beam splitters, to name a few. Here we present a theoretical and experimental study of the influence of disorder effects in SWG waveguides. We demonstrate via electromagnetic simulations and experimental measurements that even a comparatively small jitter (~5 nm) in the position and size of the SWG segments may cause a dramatic reduction in the transmittance for wide (multimode) SWG waveguides, while for narrow (single mode) waveguides this effect is negligible. Our study shows that the impact of the jitter on SWG waveguide performance is directly related to the modal confinement.
YR 2017
FD 2017
LK http://hdl.handle.net/10668/11487
UL http://hdl.handle.net/10668/11487
LA en
DS RISalud
RD Apr 8, 2025