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6CCVD Research

Robust quantification of the diamond nitrogen-vacancy center charge state via photoluminescence spectroscopy

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2025-10-01
JournalAPL Photonics
AuthorsGiannis Thalassinos, D. J. McCloskey, Alessandro Mameli, Alexander J. Healey, Charlie Pattinson
InstitutionsAustralian Research Council, Princeton Plasma Physics Laboratory

Abstract

Section titled ā€œAbstractā€

Nitrogen vacancy (NV) centers in diamond are at the heart of many emerging quantum technologies, all of which require control over the NV charge state. Hence, methods for quantification of the relative photoluminescence intensities of the NV0 and NVāˆ’ charge states, i.e., a charge state ratio, are vital. Several approaches to quantify NV charge state ratios have been reported but are either limited to bulk-like NV diamond samples or yield qualitative results. We propose an NV charge state quantification protocol based on the determination of sample- and experimental setup-specific NV0 and NVāˆ’ reference spectra. The approach employs blue (400-470 nm) and green (480-570 nm) excitation to infer pure NV0 and NVāˆ’ spectra, which are then used to quantify NV charge state ratios in subsequent experiments via least squares fitting. We test our dual excitation protocol (DEP) for a bulk diamond NV sample and 20 and 100 nm nanodiamond particles and compare results with those obtained via other commonly used techniques such as zero-phonon line fitting and non-negative matrix factorization. We find that DEP can be employed across different samples and experimental setups and yields consistent and quantitative results for NV charge state ratios that are in agreement with our understanding of NV photophysics. By providing robust NV charge state quantification across sample types and measurement platforms, DEP will support the development of NV-based quantum technologies.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2014 - Nitrogen-vacancy centers in diamond: Nanoscale sensors for physics and biology [Crossref]
  2. 2021 - Quantum computer based on color centers in diamond [Crossref]
  3. 2006 - Processing quantum information in diamond [Crossref]
  4. 2014 - Magnetometry with nitrogen-vacancy defects in diamond [Crossref]
  5. 2013 - High-precision nanoscale temperature sensing using single defects in diamond [Crossref]
  6. 2022 - A diamond voltage imaging microscope [Crossref]
  7. 2011 - Electric-field sensing using single diamond spins [Crossref]
  8. 2016 - Pure negatively charged state of the NV center in n-type diamond [Crossref]
  9. 2024 - Wavelength dependence of nitrogen vacancy center charge cycling [Crossref]
  10. 2020 - Sensitivity optimization for NV-diamond magnetometry [Crossref]

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