Abstract
Substrates effect is observed on the suppression of the phonon sideband from nitrogen vacancy (NV) centers in 50nm diamond nanocrystals at cryogenic temperatures. As a quantitative parameter of the population of phonon sidebands, the Debye-Waller factor is estimated from fluorescence spectra on glass, silicon, and silica-on-silicon substrates. Fluorescence spectra of negatively charged NV centers in nanodiamonds on silica-on-silicon substrates have average and maximum Debye-Waller factors of 12.7% (which is about six times greater than that of samples on glass substrates) and 19.3%, respectively. This effect is expected to be very important for future applications of NV centers in quantum information science and nanosensing.
Highlights
Nitrogen vacancy (NV) centers have excited great interest in recent years as they have many advantageous properties including robustness, optical transitions with long coherence times, and very long spin coherence times [1–5]
Substrates effect is observed on the suppression of the phonon sideband
Waller factor is estimated from fluorescence spectra on glass
Summary
Nitrogen vacancy (NV) centers have excited great interest in recent years as they have many advantageous properties including robustness, optical transitions with long coherence times, and very long spin coherence times [1–5]. Of the many advantageous optical properties of NV centers, zero-phonon transitions in fluorescence spectra have been extensively investigated both theoretically and experimentally [6–8]. The ZPL of negatively charged NV centers in nanodiamonds have been known to be prospective in the future quantum information processing [9], photonic quantum memories/gates [10], and nano magnetic sensors [11]. It allows the generation of a narrow-band indistinguishable single photons [12] needed for quantum computation [13,14], quantum repeaters and quantum metrology [15–17]. NV centers in nanodiamonds suffer from strong phonon sidebands, even at cryogenic temperatures [21]
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