Optics and Photonics Seminar Series at Duke University presents Maiken H. Mikkelsen

Plasmonics and enhanced light-matter interactions of a single emitter

Date: Wednesday, October 31, 2012 - 1:30pm -- Wednesday, October 31, 2012 - 2:30pm
Location: Schiciano Auditorium (Side A), Fitzpatrick Building

Plasmonics and enhanced light-matter interactions of a single emitter
Nanophotonics and plasmonics are essential for bridging nanoelectronics and diffraction-limited photonics. One central objective of plasmonics research is modifying the propagation of surface plasmon polaritons (SPPs) in order to implement diverse functionalities in the context of two-dimensional optics. First, I will discuss an effective approach to manipulate SPPs by adiabatically tailoring the topology of a dielectric layer adjacent to a metal surface using grey-scale lithography. In such a way, we are able to continuously modify the propagation constant of SPPs, analogous to traditional gradient index optics. Applying this method, we design and experimentally demonstrate two different devices: a plasmonic Luneburg lens to focus SPPs and a plasmonic Eaton lens to bend SPPs. Second, a potential alternative to plasmonics for deep-subwavelength light confinement will be discussed. Here, an all-dielectric slot-waveguide architecture is employed for deep sub-wavelength light confinement in a material with a low refractive index surrounded by high-index barriers. Individual colloidal quantum dots are controllably coupled to this waveguide mode using an AFM-tip. Large Purcell enhancements are observed from lifetime measurements of the spontaneous emission rate of individual quantum dots before and after coupling to the waveguide mode. The demonstrated system is a promising broadband and low-loss platform for quantum information applications.

Short Bio

Maiken H. Mikkelsen is an Assistant Professor of ECE and Physics at Duke University. She received her B.S. in Physics from the University of Copenhagen, Denmark in 2004 and her M.A. and Ph.D. degrees in Physics from the University of California, Santa Barbara in 2007 and 2009, respectively. She did her PhD in the group of Prof. David Awschalom on experimental studies of single electron spins in semiconductor quantum dots. Before joining Duke, she was a postdoctoral fellow in the group of Prof. Xiang Zhang at the University of California, Berkeley. In 2011 she received the European Physical Society’s Ph.D. Thesis prize from the Quantum Electronics and Optics Division. She has published articles in journals including Science, Nature Physics, and Nature Materials. Her research interests include experimental studies of spin dynamics in solid state systems, light-matter interactions in nanostructures, nanophotonics, metamaterials, and quantum information science.