Data from: Evaluation of the Laguerre-Gaussian mode purity produced by 3D-printed microwave spiral phase plates
Isakov, Dmitry et al. (2020), Data from: Evaluation of the Laguerre-Gaussian mode purity produced by 3D-printed microwave spiral phase plates, Dryad, Dataset, https://doi.org/10.5061/dryad.31zcrjdh6
Two oppositely directed horns were fed by commercial Ku-band SMA coax via waveguide adaptors (Flann Microwave) connected to a vector network analyzer (Rhode&Schwarz ZNB20) for excitation and response measurement in the frequency range 12 to 18 GHz. A computer-controlled X-Y gantry system was used to move the receiver horn in a pre-programmed pattern to map complex scattering parameters in the plane perpendicular to the beam direction, positioned at approximately 35 wavelengths from the stationary source horn.
The raw experimental data presents the table of the view (x, y, S21(12.0GHz), S21(12.5GHz), S21(13.0GHz), … S21(17.5GHz), S21(18.0GHz) ) where x and y are the scans coordinate and S21(F) is the complex transmission parameter measured in this coordinate point at the frequency F (in the range 12–18 GHz with 0.5 GHz step).
The data has simple naming such TypeSPP.txt (for the type of the SPP please refer the manuscript).
The *.mat files contain the centre position of the S21 phase for corresponding SPP and need to be used in the SPP_Mode_Ratio.m script accordingly.
Files organised as follows:
// main code //
| - SPP_Mode_Ratio.m
// Raw data //
| - GRINSPP.txt
| - GRINSPP_lens.txt
| - SmoothSPP.txt
| - SmoothSPP_lens.txt
| - StepSPP.txt
| - StepSPP_lens.txt
| - MPlex_Mode2.txt // modulation l=2
| - DeMPlex_Mode0.txt // demodulation l=0
// minimum amplitude table //
| - T_GRIN.mat
| - T_Smooth.mat
| - T_Step.mat
| - T_Mod.mat
| - T_DeMod.mat
The graphical representation of the data can be done using Matlab script.
Engineering and Physical Sciences Research Council, Award: EP/P005578/1