A new class of nonlinear nanoprobe for probing ultrafast optical near fields will be discussed, which is comprised of a fiber taper, a single nanowire attached to the taper, and functional nonlinear nanoparticles or nanocrystals attached to the nanowire. Both two-photon fluorescent and second harmonic nanoprobes will be presented. Applications to characterizing ultrashort pulses will be discussed.

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Dr. Zhiwen Liu is an associate professor of Electrical Engineering at the Pennsylvania State University. He received his Ph. D. degree in Electrical Engineering from the California Institute of Technology in 2002. After staying at Caltech for a year as a postdoctoral researcher, he joined the Penn State University in 2003. His current research at Penn State is focused on ultrafast and nonlinear optics. He received the Walker von Brimer Award at Caltech in 2001 and won the CAREER award from the National Science Foundation in 2006.