Ronald L. Walsworth

Department of Physics, Center for Brain Science,
and Center for Astrophysics
Harvard University

60 Garden Street, Cambridge, MA 02138

tel: (617) 495-7274; fax: (617) 496-7690

Research Interests:

We are an interdisciplinary research group with a focus on developing new tools and applying them to important problems in both the physical and life sciences- from fundamental physics, astrophysics and nanoscience to bioimaging, brain science and medical diagnostics.  Current areas of research include:

*  Super-resolution optical imaging and functionalized electron microscopy for brain science and other bioimaging applications.
*  Development of novel NMR and MRI tools, with applications to basic spin physics and medical imaging.
*  High-resolution magnetometry with NV-diamond, with applications in both the physical and life sciences.
*  Precision tests of fundamental physical laws and symmetries.
*  Development of improved optical wavelength calibrators for astrophysics, with applications to exoplanet searches and observational cosmology.


Selected Publications:

D.R. Glenn, H. Zhang, N. Kasthuri, R. Schalek, P.K. Lo, A. Trifonov, H. Park, J.W. Lichtman and R.L. Walsworth (2012). Multi-color correlative light and electron microscopy using nanoparticle cathodoluminescence. arXiv:1208.1249v1.

S.J. DeVience, R.L. Walsworth and M.S. Rosen (2012).  Dependence of nuclear spin singlet lifetimes on RF spin-locking power.  Journal of Magnetic Resonance 218: 5.

L.M. Pham, D. Le Sage, P.L. Stanwix, T.K. Yeung, D. Glenn, A. Trifonov, P. Cappellaro, P.R. Hemmer, M.D. Lukin, H. Park, A. Yacoby and R.L. Walsworth (2011).  Magnetic field imaging with nitrogen-vacancy ensembles.  New Journal of Physics 13: 045021.

P.C. Maurer, J.R. Maze, P.L. Stanwix, L. Jiang, A.V. Gorshkov, A.A. Zibrov, B. Harke, J.S. Hodges, A.S. Zibrov, D. Twitchen, S.W. Hell, R.L. Walsworth and M.D. Lukin (2010).  Far-field optical imaging and manipulation of individual spins with nanoscale resolution. Nature Physics 6:912.

J.W. Aptekar, M.C. Cassidy, A.C. Johnson, R.A. Barton, M.Y. Lee, A.C. Ogier, C. Vo, M.N. Anahtar, Y. Ren, S.N. Bhatia, C. Ramanathan, D.G. Cory, A.L. Hill, R.W. Mair, M.S. Rosen, R.L. Walsworth and C.M. Marcus (2009). Silicon Nanoparticles as Hyperpolarized Magnetic Resonance Imaging Agents.  ACS Nano. 3 12, 4003-4008.

P.K. Jain, Y. Xiao, R.L. Walsworth and A.E. Cohen (2009). Surface Plasmon Resonance Enhanced Magneto-Optics (SuPREMO): Faraday Rotation Enhancement in Gold-Coated Iron Oxide Nanocrystals.  Nano Letters, 9, 1644-1650.

R.W. Mair, L.L. Tsai, C.-H. Li, M.J. Barlow, R. Scheidegger, M.S. Rosen, S. Patz and R L. Walsworth (2009).  Towards Posture-Dependent Human Pulmonary Oxygen Mapping using Hyperpolarized Helium and an Open-Access MRI System. Magnetic Resonance Microscopy: Spatially Resolved NMR Techniques and Applications, Proc. 2007 International Conference on Magnetic Resonance Microscopy, (WILEY-VCH Verlag GmbH & Co, Weinheim, 2009, 117-127).

L.L. Tsai, R.W. Mair, M.S. Rosen, S. Patz and R.L. Walsworth (2008).  An Open-Access, Very-Low-Field MRI System for Posture-Dependent 3He Human Lung Imaging. Journal of Magnetic Resonance 193: 274.

L.L. Tsai, R.W. Mair, C.H. Li, M.S. Rosen, S. Patz and R.L. Walsworth (2008).  Posture-Dependent Human 3He Lung Imaging in an Open Access MRI System: Initial Results. Academic Radiology 15: 728.

J.R. Maze, P.L. Stanwix, J.S. Hodges, S. Hong, J.M. Taylor, P. Cappellaro, L. Jiang, A.S. Zibrov, A. Yacoby, R. Walsworth and M.D. Lukin  (2008).  Nanoscale magnetic sensing with an individual electronic spin in diamond.  Nature 455:644.

J.M. Taylor, P. Cappellaro, L. Childress, L. Jiang, D. Budker, P.R. Hemmer, A. Yacoby, R. Walsworth and M.D. Lukin (2008).  High-sensitivity diamond magnetometer with nanoscale resolution. Nature Physics 4:810.

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