Bulletin of the American Physical Society
42nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 56, Number 5
Monday–Friday, June 13–17, 2011; Atlanta, Georgia
Session H2: Focus Session: Advances in NV Centers |
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Chair: Tatjana Curcic, Air Force Office of Scientific Research Room: A602 |
Wednesday, June 15, 2011 8:00AM - 8:30AM |
H2.00001: Optics with Nitrogen Vacancy Centers in Diamond Invited Speaker: Quantum optical techniques can be used for cooling and coherent manipulation of atom-like systems in solid-state. This talk will focus on applications of these technique to quantum control of nitrogen vacancy (NV) centers in diamond. Specifically, we will demonstrate that Coherent Population Trapping can be used for optical cooling, real-time measurement and manipulation of nuclear spin dynamics surrounding NV centers. In addition, novel implementations of cavity QED with NV centers will be described. Finally, potential applications of these techniques to nanoscale magnetometry and realization of quantum networks will be discussed. [Preview Abstract] |
Wednesday, June 15, 2011 8:30AM - 8:42AM |
H2.00002: Magnetic field imaging with NV ensembles L.M. Pham, D. Le Sage, P.L. Stanwix, T.K. Yeung, D. Glenn, A. Trifonov, N. Bar-Gill, C. Belthangady, P. Cappellaro, P.R. Hemmer, M.D. Lukin, H. Park, A. Yacoby, R.L. Walsworth We demonstrate a method of imaging spatially varying magnetic fields using a thin layer of nitrogen-vacancy (NV) centers at the surface of a diamond chip. Fluorescence emitted by the two- dimensional NV ensemble is detected by a CCD array, from which a vector magnetic field pattern is reconstructed. As a demonstration, current is passed through wires placed on the diamond chip surface, and the resulting magnetic field patterns are imaged with sub- micron resolution over a 140 $\rm{\mu m}$ $\times$ 140 $\rm{\mu m}$ field of view, giving single-pixel sensitivity $\sim 100$ $\rm{nT/\sqrt{Hz}}$. We discuss ongoing efforts to further improve sensitivity, such as using dynamical decoupling techniques in order to extend coherence times. [Preview Abstract] |
Wednesday, June 15, 2011 8:42AM - 8:54AM |
H2.00003: Progress on NV-diamond ensemble magnetometry David Le Sage, Linh My Pham, Keigo Arai, Andrew Higginbotham, Paul Stanwix, Ye Zhao, Ronald Walsworth We discuss progress on new techniques for precision magnetometry using ensembles of NV centers in diamond. One technique uses the large refractive index diamond substrate as a light guide to achieve much higher fluorescence detection efficiency than provided by high NA microscope objectives. An alternate approach measures the absorption of the NV excitation light by an optically thick diamond sample. In all approaches, diamond sample engineering plays a crucial role in finding an optimal balance between the NV center density and NV spin coherence time. [Preview Abstract] |
Wednesday, June 15, 2011 8:54AM - 9:24AM |
H2.00004: Quantum physics with small diamond spin clusters Invited Speaker: Diamond spins are an ideal test bed for exploring quantum physics of few well controllable qubit systems. Defect center electron spins show strong coupling to a light field and at the same time interact with few surrounding nuclei in the lattice. As a result the system usually constitutes a few qubit system with excellent coherence and controllability even at room temperature. It fulfills all characteristics of a quantum register including single shot read-out capability. The talk will highlight how to use such systems for carrying out quantum algorithms which might be even usable for sensing applications. [Preview Abstract] |
Wednesday, June 15, 2011 9:24AM - 9:36AM |
H2.00005: Towards Environmentally-Enhanced Magnetometry using Nitrogen-Vacancy Centers in Diamond Chinmay Belthangady, Nir Bar-Gill, My Linh Pham, David Le Sage, Paola Cappellaro, Ronald Walsworth The sensitivity of nitrogen-vacancy (NV) diamond magnetometers improves as the number of NV-centers in the probe volume increases. The conversion efficiency of implanted Nitrogen (N) atoms to NV-centers in chemical-vapor-deposition-grown diamond is at best about 10 percent, but in most cases is much lower. Due to this poor conversion efficiency, the environment around each NV center is dominated by several N electron spins. This N-spin-rich environment and the consequent NV-N dipolar interaction is considered, in conventional NV-based magnetometers, to be a source of dephasing and is sought to be eliminated by using various decoupling techniques. However, being more numerous per unit volume than NV-centers, the N spins can themselves be used for magnetic-field sensing. The NV-N interaction may then be exploited to combine the ease of initialization and read-out of NV-centers with the magnetic- field sensing capabilities of the more numerous N spins to enhance the sensitivity of NV-based magnetometers. In our talk we will describe recent progress towards such environmentally- enhanced NV diamond magnetometry. [Preview Abstract] |
Wednesday, June 15, 2011 9:36AM - 9:48AM |
H2.00006: Cathodoluminescence Imaging Using Nanodiamond Color Centers David Glenn, Huiliang Zhang, Narayanan Kasthuri, Alexei Trifonov, Richard Schalek, Jeff Lichtman, Ronald Walsworth We demonstrate a nanoscale imaging technique based on cathodoluminescence (CL) emitted by color centers in nanodiamonds (NDs) under excitation by an electron beam in a scanning electron microscope (SEM). We have identified several classes of color centers that are spectrally distinct at room temperature and can be obtained with high reliability in NDs with diameters on the order of 50 nm or smaller. Compared to standard CL markers, ND color centers are bright and highly stable under SEM excitation. In conjunction with appropriate functionalization of the ND surfaces, ND-CL will provide nanoscale information about molecular function to augment the structural information obtained with standard SEM techniques. We discuss an exciting application of this approach to neuroscience, specifically in the generation of high-resolution maps of the connections between neurons (``Connectomics''). [Preview Abstract] |
Wednesday, June 15, 2011 9:48AM - 10:00AM |
H2.00007: Techniques for super-resolution microscopy using NV-diamond Alexei Trifonov, David Glenn, Nir Bar-Gill, David Le Sage, Ronald Walsworth We discuss the development and application of techniques for super-resolution microscopy using NV centers in diamond: stimulated emission depletion (STED), metastable ground state depletion (GSD), and stochastic optical reconstruction microscopy (STORM). NV centers do not bleach under optical excitation, are not biotoxic, and have long-lived electronic spin coherence and spin-state-dependent fluorescence. Thus NV-diamond has great potential as a fluorescent biomarker and as a magnetic biosensor. [Preview Abstract] |
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