RT Journal Article
T1 Ultra-broadband nanophotonic phase shifter based on subwavelength metamaterial waveguides
A1 Gonzalez-Andrade, David
A1 Manuel Luque-Gonzalez, Jose
A1 Wanguemert-Perez, J. Gonzalo
A1 Ortega-Monux, Alejandro
A1 Cheben, Pavel
A1 Molina-Fernandez, Inigo
A1 Velasco, Aitor V.
K1 Multimode interference couplers
K1 Refractive-index
K1 Efficient
K1 Compact
K1 Principles
K1 Conversion
K1 Bandwidth
K1 Gratings
K1 Scheme
K1 Switch
AB Optical phase shifters are extensively used in integrated optics not only for telecom and datacom applications but also for sensors and quantum computing. While various active solutions have been demonstrated, progress in passive phase shifters is still lacking. Here we present a new type of ultra-broadband 90 degrees phase shifter, which exploits the anisotropy and dispersion engineering in subwavelength metamaterial waveguides. Our Floquet-Bloch calculations predict a phase-shift error below +/- 1.7 degrees over an unprecedented operation range from 1.35 to 1.75 mu m, i.e., 400 nm bandwidth covering the E, S, C, L, and U telecommunication bands. The flat spectral response of our phase shifter is maintained even in the presence of fabrication errors up to +/- 20 nm, showing greater robustness than conventional structures. Our device was experimentally demonstrated using standard 220 nm thick SOI wafers, showing a fourfold reduction in the phase variation compared to conventional phase shifters within the 145 nm wavelength range of our measurement setup. The proposed subwavelength engineered phase shifter paves the way for novel photonic integrated circuits with an ultra-broadband performance. (C) 2020 Chinese Laser Press
PB Optical soc amer
SN 2327-9125
YR 2020
FD 2020-03-01
LK http://hdl.handle.net/10668/19146
UL http://hdl.handle.net/10668/19146
LA en
DS RISalud
RD Apr 18, 2025