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 ...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°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°over an unprecedented operation range from 1.35 to 1.75μm,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 standard220 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.展开更多
Many applications, including optical multiplexing, switching, and detection, call for low-cost and broadband photonic devices with polarization-independent operation. While the silicon-on-insulator platform is well po...Many applications, including optical multiplexing, switching, and detection, call for low-cost and broadband photonic devices with polarization-independent operation. While the silicon-on-insulator platform is well positioned to fulfill most of these requirements, its strong birefringence hinders the development of polarizationagnostic devices. Here we leverage the recently proposed bricked metamaterial topology to design, for the first time, to our knowledge, a polarization-independent 2 × 2 multimode interference coupler using standard 220 nm silicon thickness. Our device can be fabricated with a single etch step and is optimized for the O-band,covering a wavelength range of 160 nm with excess loss, polarization-dependent loss, and imbalance below 1 dB and phase errors of less than 5°, as demonstrated with full three-dimensional finite-difference time-domain simulations.展开更多
基金Spanish Ministry of Science,Innovation and Universities(MICINN)(IJCI-2016-30484,RTI2018-097957-B-C33TEC2015-71127-C2-1-R with FPI Scholarship BES-2016-077798+5 种基金TEC2016-80718-RAlcyon Photonics S.L.Through CDTI SNEO-20181232)Spanish Ministry of EducationCulture and Sport(MECD)(FPU16/06762)Community of Madrid-FEDER Funds(S2018/NMT-4326)Horizon 2020 Research and Innovation Program(Marie Sklodowska-Curie 734331)。
文摘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°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°over an unprecedented operation range from 1.35 to 1.75μm,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 standard220 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.
基金Ministerio de Economía y Competitividad(PID2019-106747RB-I00)Junta de Andalucía (P18-RT-1453, UMA-FEDERJA-158)+1 种基金Ministerio de Ciencia,Innovación y Universidades (FPU16/06762, FPU19/02408)Universidad de Málaga.
文摘Many applications, including optical multiplexing, switching, and detection, call for low-cost and broadband photonic devices with polarization-independent operation. While the silicon-on-insulator platform is well positioned to fulfill most of these requirements, its strong birefringence hinders the development of polarizationagnostic devices. Here we leverage the recently proposed bricked metamaterial topology to design, for the first time, to our knowledge, a polarization-independent 2 × 2 multimode interference coupler using standard 220 nm silicon thickness. Our device can be fabricated with a single etch step and is optimized for the O-band,covering a wavelength range of 160 nm with excess loss, polarization-dependent loss, and imbalance below 1 dB and phase errors of less than 5°, as demonstrated with full three-dimensional finite-difference time-domain simulations.
