Jeffrey R. Guest
Jeffrey Guest explores electronic, magnetic, optical properties of matter on nanometer length scales using ultrahigh vacuum scanning probe microscopy and ‘single particle’ laser spectroscopy techniques. He also studies and develops new ways of measuring and controlling mechanical motion of nanofabricated and self-assembled nanoscale systems.
Guest joined the Center for Nanoscale Materials (CNM) in the Nanoscience and Technology Division in 2007. He joined Argonne in 2004 as the Arthur Holly Compton postdoctoral fellow in the Physics Division, where he demonstrated laser-cooling and trapping of radium atoms for the first time as a first step towards a measurement of their electric dipole moment (a signature of time-reversal violating interactions).
In his current experimental work at the CNM, he is interested in understanding and controlling the electronic, magnetic, and particularly optical properties of molecular and nanoscale systems. These properties are largely determined by structure and environment at the atomic scale. In order to control and characterize these nanoscale systems at these length scales, he is combining low temperature ultra-high-vacuum scanning tunneling microscopy (LT UHV STM) and confocal optical microscopy and spectroscopy to explore single atoms or molecules, functionalized graphene and self-assembled molecular heterojunctions. He is particularly interested in (i) graphene-based nanophotonics, (ii) photophysics of molecular acceptor-donor complexes, (iii) nanoplasmonics and tip-enhanced laser spectroscopies, and (iv) the limits of electronic and spin quantum coherence in nanoscale systems at surfaces.
Jeffrey has also been developing new approaches to measuring and controlling nanomechanical motion in nanofabricated and self-assembled systems. Using interferometric laser microscopy techniques, he is studying mechanical dynamics of membranes self-assembled from functional nanoparticles and nonlinear dynamics in nanofabricated structures. He is also developing new techniques to drive and measure the high frequency vibrations of the nanoparticles themselves. These approaches may open new doors to coupling the intrinsic functionality of nanoparticles and nanoscale systems to mechanical motion, providing new opportunities in sensing and control.