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The nitrogen vacancy center in diamond: from exploring the dynamics of trapped charge to imaging individual magnetic nanoparticles

Thursday April 20, 2017
11:00 am

 Presenter:  Dr. Abdelghani Laraoui, CHTM, UNM
 Series:  OSE Seminars
 Abstract:  The negatively-charged nitrogen-vacancy (NV-) center in diamond is the focus of widespread attention for applications ranging from quantum information processing to nanoscale metrology such nuclear magnetic resonance spectroscopy and thermal conductivity mapping. Of interest in these applications is the manipulation of the NV charge state, which can be attained by optical excitation. In this talk I will discuss recent experimental results at CCNY on the dynamics of NV photo-ionization, charge diffusion, and trapping in nitrogen-rich diamond. Using multi-color confocal microscopy, we uncover the formation of mesoscale patterns of trapped charge, which we qualitatively reproduce via a model of the interplay between photo-excited carriers and atomic defects. Further, by using the NV as a probe, we map the relative fraction of positively charged nitrogen on localized optical excitation. Finally, I will talk about my recent work at CHTM-UNM on using a layer of NVs (150 nm) doped in diamond thin film for imaging magnetic nanoparticles (MNPs). I will explore new strategies for high-sensitivity, parallel characterization and sorting of individual MNPs and apply them to outstanding challenges in biomedicine and data storage.
 Location:  Room 103, Center for High Tech Materials

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