Abstract
We investigate the effects of laser-induced heating of NV− and P1 defects in diamonds by X-band CW EPR spectroscopy, with particular attention to temperature effects on the zero field splitting and electron polarization. A 532 nm laser with intensities of 7–36 mW is sufficient to heat diamond samples from room temperature to 313–372 K in our experimental setup. The temperature effects on the determined NV− zero-field splittings are consistent with previously observed non-optical heating experiments. Electron spin polarization of the NV− defects were observed to increase, then saturate, with increasing laser light intensities up to 36 mW after accounting for heating effects. We observe that EPR signal intensities from P1 centers do not follow a Boltzmann trend with laser-induced sample heating. These findings have bearing on the design of diamond-based polarization devices and magnetometry applications.
Highlights
Charged nitrogen-vacancy centers (NV−) in diamonds are C3v-symmetry defects and consist of a substitutional nitrogen and an adjacent carbon-vacancy [1]
We report time-dependent laser-induced heating effects on NV− and substitutional nitrogen (P1) defects in HPHT Ib diamonds by X-band CW EPR spectroscopy
After accounting for laser heating effects, we find that NV− electron polarization decreases with increasing temperature as expected, and increases with laser illumination intensity at isothermal conditions
Summary
Charged nitrogen-vacancy centers (NV−) in diamonds are C3v-symmetry defects and consist of a substitutional nitrogen and an adjacent carbon-vacancy [1]. The accessible electron Zeeman hyperpolarization offers utilization in magnetic spectroscopy and imaging through strongly enhanced resolution; through transfer of polarization to neighboring nuclear and electron spins [13,14,15,16,17,18,19,20,21,22]. These applications require accurate knowledge of the zero field splitting and/or the degree of NV− polarization
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