Characterization of strong NV- gradient in the e-beam irradiated diamond sample

We report on studies of a diamond sample with a strong gradient of NV^- concentration (between 4 and 36 ppm over 1.5 mm) created by inhomogeneous irradiation with an electron beam. The sample was characterized by spatially resolved luminescence and ODMR spectra and spatial distributions of NV^- concentration, strain splitting, and relaxation times T₁, T₂. Such inhomogeneous sample may find applications in designing optimum conditions for numerous applications in spectroscopy and sensorics.