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تسجيل مستخدم جديدCircularly polarized microwaves for magnetic resonance study in the GHz range: application to nitrogen-vacancy in diamonds
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The ability to create time-dependent magnetic fields of controlled polarization is essential for many experiments with magnetic resonance. We describe a microstrip circuit that allows us to generate strong magnetic field at microwave frequencies with arbitrary adjusted polarization. The circuit performance is demonstrated by applying it to an optically detected magnetic resonance and Rabi nutation experiments in nitrogen-vacancy color centers in diamond. Thanks to high efficiency of the proposed microstrip circuit and degree of circular polarization of 85% it is possible to address the specific spin states of a diamond sample using a low power microwave generator.
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Nitrogen-vacancy (NV) centers in millimeter-scale diamond samples were produced by irradiation and subsequent annealing under varied conditions. The optical and spin relaxation properties of these samples were characterized using confocal microscopy,
visible and infrared absorption, and optically detected magnetic resonance. The sample with the highest NV- concentration, approximately 16 ppm = 2.8 x 10^{18} cm^{-3}, was prepared with no observable traces of neutrally-charged vacancy defects. The effective transverse spin relaxation time for this sample was T2* = 118(48) ns, predominately limited by residual paramagnetic nitrogen which was determined to have a concentration of 52(7) ppm. Under ideal conditions, the shot-noise limited sensitivity is projected to be ~150 fT/sqrt{Hz} for a 100 micron-scale magnetometer based on this sample. Other samples with NV- concentrations from .007 to 12 ppm and effective relaxation times ranging from 27 to 291 ns were prepared and characterized.
We demonstrate a robust, scale-factor-free vector magnetometer, which uses a closed-loop frequency-locking scheme to simultaneously track Zeeman-split resonance pairs of nitrogen-vacancy (NV) centers in diamond. Compared with open-loop methodologies,
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Recently we have demonstrated AC magnetic field sensing scheme using a simple continuous-wave optically detected magnetic resonance of nitrogen-vacancy centers in diamond [Appl. Phys. Lett. 113, 082405 (2018)]. This scheme is based on electronic spin
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