Magnetometry with nitrogen-vacancy ensembles in diamond based on infrared absorption in a doubly resonant optical cavity

Abstract

We propose to use an optical cavity to enhance the sensitivity of magnetometers relying on the detection of the spin state of high-density nitrogen-vacancy ensembles in diamond using infrared optical absorption. The role of the cavity is to obtain a contrast in the absorption-detected magnetic resonance approaching unity at room temperature. We project an increase in the photon shot-noise limited sensitivity of two orders of magnitude in comparison with a single-pass approach. Optical losses can limit the enhancement to one order of magnitude which could still enable room temperature operation. Finally, the optical cavity also allows to use smaller pumping power when it is designed to be resonant at both the pump and the signal wavelength.

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• CVD diamond single crystals with NV centres: a review of material synthesis and technology for quantum sensing applications
• The Infrared Absorption Band and Vibronic Structure of the Nitrogen-Vacancy Center in Diamond
• Vector magnetometry using silicon vacancies in 4H-SiC at ambient conditions
• Miniature cavity-enhanced diamond magnetometer
• Microwave-free vector magnetometry with nitrogen-vacancy centers along a single axis in diamond
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• Experimental and theoretical analysis of noise strength and environmental correlation time for ensembles of nitrogen-vacancy centers in diamond
• Cross-relaxation studies with optically detected magnetic resonances in nitrogen-vacancy centers in diamond in an external magnetic field
• Diamond Nitrogen-Vacancy Center Magnetometry: Advances and Challenges
• Enhanced spin state readout of Nitrogen-Vacancy centers in diamond using IR fluorescence
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• High-contrast absorption magnetometry in the visible to near-infrared range with nitrogen-vacancy ensembles
• Saturable absorption in defect-rich diamond nanophotonics