Assistant Professor of Chemistry
Adjunct Assistant Professor of Applied Mathematics
Ph.D. University of Florida, 2004
(Theoretical Chemistry, Many-body Theory, Nanoscale Optics)
Research in the Masiello group focuses on the development of novel, rigorous, and computationally tractable theoretical descriptions of the structure and dynamics of molecular, nanoscale, and mesoscopic systems, and their interactions with and through the electromagnetic field. Emphasis is placed, not upon performing ever larger computations with well-worn tools, but rather upon exploring uncharted directions through the formulation and implementation of new theoretical concepts. We aim to elucidate photochemistry in condensed-phase environments, plasmon-enhanced molecular sensing and plasmon-enhanced molecular spectroscopy, as well as a variety of problems in nanoscale optics by simultaneously blending together the most important aspects of both top-down and bottom-up descriptions of nature. Correct treatment of such requires that molecular-, nano-, and mesoscale phenomena all be addressed as a coherent whole, rather than a less-complete sum of three parts. We do this by utilizing molecular-electron propagator methods as well as explicitly time-dependent descriptions of quantum molecular dynamics coupled to continuum electrodynamics. We also employ purely classical electromagnetic theory, such as finite-difference, finite-element, and multipole methods, particularly in our collaborations with experimentalists working in related directions both at UW and elsewhere. Development of the software necessary to explore each of these theoretical concepts is an essential aspect of our research as we work in areas where few black-box applications exist.
Single-Molecule Surface-Enhanced Raman Scattering: Can STEM/EELS Image Electromagnetic Hot Spots?
N. Mirsaleh-Kohan, V. Iberi, P. D. Simmons Jr., N. W. Bigelow, A. Vaschillo, M. M. Rowland, M. D. Best, S. J. Pennycook, D. J. Masiello, B. S. Guiton, and J. P. Camden
Journal of Physical Chemistry Letters 3, 2303 (2012).
Characterization of the electron- and photon-driven plasmonic excitations of metal nanorods
N. W. Bigelow, A. Vaschillo, V. Iberi, J. P. Camden, and D. J. Masiello
ACS Nano 6, 7497 (2012).
Super-Resolution Imaging Reveals a Difference Between SERS and Luminescence Centroids
M. L. Weber, J. P. Litz, D. J. Masiello, and K. A. Willets
ACS Nano 6, 1839 (2012).
Sub-microsecond local dynamics probed with atomic force microscopy
R. Giridharagopal, G. E. Rayermann, G. Shao, D. T. Moore, O. G. Reid, A. F. Tillack, D. J. Masiello, and D. S. Ginger
Nano Letters 12, 893 (2012).
Spatial, Spectral, and Coherence Mapping of Single-Molecule SERS Active Hot Spots via the Discrete-Dipole Approximation
J. P. Litz, J. P. Camden, and D. J. Masiello
Journal of Physical Chemistry Letters 2, 1695 (2011).