Joanna Atkin

Joanna Atkin

Assistant Professor

   Caudill Laboratories 117
  Group Website
  Curriculum Vitae

Research Interests

Near-field optics and imaging, Tip-enhanced spectroscopy, Plasmonics

Research Synopsis

Infrared and visible spectroscopies can provide a wide range of information about electronic and chemical structure and dynamics in materials systems. However, the information has a relatively low spatial resolution, determined by the diffraction limit of light.

With the increasing development of nanostructures, low dimensional materials, and devices based on nanoscale morphology, the need for nanometer-scale optical and infrared techniques has grown. One approach is scattering-scanning near-field optical spectroscopy, s-SNOM. This nano-optical spectroscopy takes advantage of the "optical antenna" properties of metallic nanostructures, such as an atomic force microscope tip, to concentrate and locally enhance light.

This is compatible with a wide range of optical spectroscopies, and enables nanometer spatial resolution. In this way, it is possible to probe the structure and behavior of systems such as 1D and 0D nanostructures, which often show heterogeneous strain and doping profiles. Polymer and bulk heterojunction photovoltaic devices also rely on complex nanoscale morphology for improved performance, but the interplay of the electric field at interfaces and modification of vibrational properties with overall performance is not well understood.

Biological imaging is also a field of research where high spatial resolution coupled with chemical specificity can provide novel information about, for example protein folding or tissue damage. Our research is multidisciplinary, interfacing chemistry, biology, materials science, physics, and engineering. Interested students please contact me to discuss possible research projects.

Professional Background

B.S. Victoria University of Wellington, New Zealand, 2002; Ph.D. Physics, Columbia University, New York, 2010; Postdoctoral Research Scientist, University of Colorado, Boulder, 2010-2014.

News & Publications

Tellurene-the 2D form of elemental tellurium-provides an attractive alternative to conventional 2D semiconductors due to its high bipolar mobilities, facile solution processing, and the possibility of dopant intercalation into its 1D van der Waals lattice. Here, we study the microscopic origin of transport anisotropy in lithographically defined four-terminal tellurene devices using spatially resolved near-field scanning microwave microscopy (SMM).


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