Abstract
We report the photoluminescence characteristics of a colour centre in diamond grown by plasma-assisted chemical vapour deposition. The colour centre emits with a sharp zero-phonon line at 2.330 eV (λ=532 nm) and a lifetime of 3.3 ns, thus offering potential for a high-speed single-photon source with green emission. It displays a vibronic emission spectrum with a Huang–Rhys parameter of 2.48 at 77 K. Hanbury–Brown and Twiss measurements reveal that the electronic level structure of the defect includes a metastable state that can be populated from the optically excited state.
Highlights
We present a spectroscopic study of a single-colour centre with the principal ZPL at 2.330 eV (532 nm), found in high-purity diamond grown by chemical vapour deposition (CVD)
We show that its luminescence signature has similarities to that of NV−, but with weaker phonon coupling and a shorter excited state lifetime, indicating potential for its use in quantum photonics applications
The 578 nm line narrows in a fashion similar to the main 532 nm line upon cooling, but undergoes a smaller blue-shift of 0.2 nm
Summary
The sample studied was a high purity, [001]-oriented type IIa diamond grown by microwave plasma-assisted CVD [23]. In the former case, a 532 nm laser cleanup filter is used in excitation, combined with a 540 nm dichroic beam splitter and a 532 nm. Under 473 nm excitation the filter set included a narrow band-pass clean-up filter in the excitation optics, a 500 nm dichroic beam splitter and an abrupt 510 nm long-pass filter in collection. In both images the ‘532’ colour centre is circled. The other defects observed are either NV− centres (visible under 532 nm excitation but not 473 nm) or other colour centres that are not photostable single emitters and are not considered further here
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