Determining Strain Components in a Diamond Waveguide from Zero-Field ODMR Spectra of NV^- Center Ensembles
arxiv(2024)
摘要
The negatively charged nitrogen-vacancy (NV^-) center in diamond has
shown great potential in nanoscale sensing and quantum information processing
due to its rich spin physics. An efficient coupling with light, providing
strong luminescence, is crucial for realizing these applications. Laser-written
waveguides in diamond promote NV^- creation and improve their coupling to
light but at the same time induce strain in the crystal. The induced strain
contributes to light guiding but also affects the energy levels of NV^-
centers. We probe NV^- spin states experimentally with the commonly used
zero-field optically detected magnetic resonance (ODMR). In our waveguides, the
ODMR spectra are shifted, split, and consistently asymmetric, which we
attribute to the impact of local strain. To understand these features, we model
ensemble ODMR signals in the presence of strain. By fitting the model results
to the experimentally collected ODMR data we determine the strain tensor
components at different positions, thus determining the strain profile across
the waveguide. We show that ODMR spectroscopy can be used as a strain imaging
tool. The resulting strain within the waveguide is dominated by a compressive
axial component transverse to the waveguide structure, with a smaller
contribution from vertical and shear strain components.
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