High density NV sensing surface created via He^(+) ion implantation of (12)^C diamond

We present a promising method for creating high-density ensembles of nitrogen-vacancy centers with narrow spin-resonances for high-sensitivity magnetic imaging. Practically, narrow spin-resonance linewidths substantially reduce the optical and RF power requirements for ensemble-based sensing. The method combines isotope purified diamond growth, in situ nitrogen doping, and helium ion implantation to realize a 100 nm-thick sensing surface. The obtained 10^(17) cm^(-3) nitrogen-vacancy density is only a factor of 10 less than the highest densities reported to date, with an observed spin resonance linewidth over 10 times more narrow. The 200 kHz linewidth is most likely limited by dipolar broadening indicating even further reduction of the linewidth is desirable and possible.Comment: 5 pages including references. 3 figure

Sinonasal cancer

International audienceSinonasal cancer, the cancer of the nose and paranasal cavities, is rare with an incidence below 2/100,000 person-year; the incidence is lowest among women and with distinct differences between countries. These variations in incidence are mostly explained by differences in occupational exposure, in particular exposure to wood dust, which is by far the major risk factor. This chapter gives an overview of epidemiological studies on sinonasal cancer dealing with epidemiological evidence for various occupational risk factors, exposure characteristics, tumor pathology, findings from experimental and human studies contributing to understanding of cancer mechanisms, and, finally, with molecular alterations observed in sinonasal cancer tissue available as potential molecular markers. The main studies and their findings as well as the principal pathological features of sinonasal tumors are summarized in tables and exemplified in illustrations. © Springer Nature Switzerland AG 2020