Color centers in diamond are promising platforms for quantum technologies. Most color centers in diamond discovered thus far emit in the visible or near-infrared wavelength range, which are incompatible with long-distance fiber communication and unfavorable for imaging in biological tissues. Here, we report the experimental observation of a new color center that emits in the telecom O-band, which we observe in silicon-doped bulk single crystal diamonds and microdiamonds. Combining absorption and photoluminescence measurements, we identify a zero-phonon line at 1221 nm and phonon replicas separated by 42 meV. Using transient absorption spectroscopy, we measure an excited state lifetime of around 270 ps and observe a long-lived baseline that may arise from intersystem crossing to another spin manifold.
@article{arxiv.2211.05969,
title = {A telecom O-band emitter in diamond},
author = {Sounak Mukherjee and Zi-Huai Zhang and Daniel G. Oblinsky and Mitchell O. de Vries and Brett C. Johnson and Brant C. Gibson and Edwin L. H. Mayes and Andrew M. Edmonds and Nicola Palmer and Matthew L. Markham and Ádám Gali and Gergő Thiering and Adam Dalis and Timothy Dumm and Gregory D. Scholes and Alastair Stacey and Philipp Reineck and Nathalie P. de Leon},
journal= {arXiv preprint arXiv:2211.05969},
year = {2023}
}