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With the advent of quantum technology, nitrogen vacancy ($NV$) centers indiamond turn out to be a frontier which provides an efficient platform forquantum computation, communication and sensing applications. Due to the coupledspin-charge dynamics of the $NV$ system, knowledge about $NV$ charge statedynamics can help to formulate efficient spin control sequences strategically.Through this paper we report two spectroscopy-based deconvolution methods tocreate charge state mapping images of ensembles of $NV$ centers in diamond.First, relying on the fact that an off axis external magnetic field mixes theelectronic spins and selectively modifies the photoluminescence (PL) of $NV^-$,we perform decomposition of the optical spectrum for an ensemble of $NV$s andextract the spectra for $NV^-$ and $NV^0$ states. Next, we introduce an opticalfilter based decomposition protocol and perform PL imaging for $NV^-$ and$NV^0$. Earlier obtained spectra for $NV^-$ and $NV^0$ states are used tocalculate their transmissivities through a long pass optical filter. Theseresults help us to determine the spatial distribution of the $NV$ charge statesin a diamond sample.

Magnetic field-assisted spectral decomposition and imaging of charge states of NV centers in diamond