Data repository for "Graphene phase modulators operating in the transparency regime"

Data repository consists of four folder, containing: 1) Optoelectronic modelling of graphene double single-layer graphene modulators. The equivalent electrical circuit is modelled as a simple low-pass RC filter using Matlab, and the results can be accessed as .txt files and in Origin Lab (.opj). The results contain the frequency response of modulators as a function of graphene mobility. Optical simulations were performed with Lumerical. Results are saved as .opj file and can be accessed in Origin Lab. 2) Raman spectroscopy of as-grown graphene and transferred graphene between fabrication steps. We used a Renishaw InVia spectrometer equipped with 50x objective at 514.5 nm wavelength, with a resolution of 1/cm. The collected spectra, together with the extrapolated residual doping, carrier density, doping type and strain, are saved as .opj files and can be accessed in Origin Lab. 3) Static and dynamic frequency response of graphene modulators. Static (DC) response was measured on a probe station equipped with DC electrical probes and optical fibres. Electrical probes were connected to a source-measure unit from Keysight, while fibres were connected to tuneable lasers from Keysight operating at 1550 nm. The frequency response was measured using a RF signal generator (50 GHz), RF Infinity probes (40 GHz) and a InGaAs photodiode (Newport, 45 GHz) connected to an electrical spectrum analyzer. The setup was calibrated, and the results are saved in a file titled "Calibration-BW-20Hz-Span-20kHz-2019-08-01--14_48_48.txt". The bandwidth can be extracted by subtracting the calibration file from the remaining files in the "BW" folder. All files are saved as .txt files and can be visualized with the preferred plotting tool. 4) Static response of graphene Mach-Zehnder modulators. The setup used is the same as the one described in 3). The extinction ratio, insertion loss and wavelength shift as a function of gate voltage are recorded and saved as .txt files. Hence, they can be visualized with the preferred plotting tool.