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Determining the internal quantum efficiency of shallow-implanted nitrogen-vacancy defects in bulk diamond
Researchers quantified the internal quantum efficiency (IQE) of nitrogen-vacancy (NV) defects in diamond. They measured high IQE values for shallow NV defects, crucial for quantum technologies.
Area of Science:
- Quantum Optics
- Materials Science
- Solid-State Physics
Background:
- Nitrogen-vacancy (NV) defects in diamond are known for luminescence.
- The precise internal quantum efficiency (IQE) of NV defects has remained unquantified.
- Accurate IQE values are essential for optimizing NV-based quantum applications.
Purpose of the Study:
- To experimentally determine the IQE of shallow-implanted NV defects in bulk diamond.
- To validate a method for quantifying IQE by modifying the local density of optical states.
- To investigate the influence of excitation power on NV defect behavior.
Main Methods:
- Implementation of Drexhage's scheme for controlled modification of the local density of optical states.
- Utilizing a spherical metallic mirror to alter the decay rate of NV defects.
- Calibrated measurements of total decay rates to deduce IQE.
Main Results:
- Quantified IQE for NV defects at 4.5 ± 1 nm depth as 0.70 ± 0.07.
- Quantified IQE for NV defects at 8 ± 2 nm depth as 0.82 ± 0.08.
- Observed that photo-induced relaxation is significant at 532 nm excitation, even below saturation.
Conclusions:
- Successfully quantified the IQE of shallow NV defects in diamond.
- Demonstrated the effectiveness of the modified Drexhage's scheme for IQE determination.
- The high IQE values suggest significant potential for NV defects in quantum information processing and sensing.
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