Photonics Research, Volume. 8, Issue 3, 359(2020)
Ultra-broadband nanophotonic phase shifter based on subwavelength metamaterial waveguides
Fig. 1. Schematics of three types of passive phase shifters: (a) our proposed ultra-broadband PS comprising two SWG waveguides with the same period (
Fig. 2. Comparison of the PSE as a function of wavelength for the three designed PSs: tapered PS (blue curve), asymmetric PS (green curve), and asymmetric SWG PS (red curve).
Fig. 3. (a) PSE as a function of wavelength for two parallel SWG waveguides with
Fig. 4. Simulated maximum PSE in the wavelength range 1.35–1.75 μm. For each wavelength, the highest error between
Fig. 5. Schematic of the test structures used to experimentally characterize (a) the tapered PS and (b) the asymmetric SWG PS. Each structure is composed of two ultra-broadband SWG MMIs and 14 PSs connected in series, forming an MZI. SEM images of the fabricated (c) tapered PS and (d) asymmetric SWG PS as indicated by the blue box in the schematic.
Fig. 6. Measured spectra of the MZIs (a) with 14 tapered PSs and (b) with 14 SWG PSs. The light was injected through port 1, and both outputs of the test structure (ports 3 and 4) were measured. (c) Measured PSE for a single tapered PS (solid blue line) and a single asymmetric SWG PS (solid red line). Dotted lines correspond to the simulation results obtained via 3D-FDTD.
Fig. 7. Fitting of the circuit model to the measured spectra of the MZIs with (a) 14 tapered PSs and (b) 14 SWG PSs.
|
Get Citation
Copy Citation Text
David González-Andrade, José Manuel Luque-González, J. Gonzalo Wangüemert-Pérez, Alejandro Ortega-Moñux, Pavel Cheben, Íñigo Molina-Fernández, Aitor V. Velasco. Ultra-broadband nanophotonic phase shifter based on subwavelength metamaterial waveguides[J]. Photonics Research, 2020, 8(3): 359
Category: Silicon Photonics
Received: Jul. 19, 2019
Accepted: Dec. 24, 2019
Published Online: Feb. 26, 2020
The Author Email: David González-Andrade (david.gonzalez@csic.es)