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REU

January 23, 2013

FRONTIERS IN MATERIALS SCIENCE
VINSE COLLOQUIUM SERIES

Luca Dal Negro
Associate Professor of Electrical Engineering and Computer Science
Boston University

"MATERIALS AND FIELDS AT THE NANOSCALE: ENGINEERING COUPLED RESONANCES FOR PLANAR OPTICAL DEVICES"
Featheringill Hall, 134
4:10 pm

 The ability to design and control light-matter interactions using metal-dielectric optical nanostructures is at the heart of nano-optics and photonics. Efficient schemes for nanoscale electromagnetic field enhancement, concentration and manipulation over predefined spatial/spectral bandwidths are enabled by the engineering of propagating and non-propagating electromagnetic fields in resonant nanostructures that are coupled at multiple length scales. In particular, recent advancements in the design and fabrication of metal-dielectric arrays of nanoparticles have demonstrated unique opportunities to produce novel functionalities that leverage photonic-plasmonic coupled resonances, such as broadband optical nano-antennas, near-field concentrators and extractors, novel laser nanocavities, optical biosensors, and on-chip nonlinear optical elements.  In this talk, I will discuss some of our recent results on the design, nanofabrication and optical characterization of photonic-plasmonic coupled nanostructures for a number of optical engineering device applications. Specifically, I will focus on retardation and multiple scattering effects in nanoplasmonic devices to boost the intensity of nanoscale optical fields over specified spatial locations and frequency bandwidths. I will then introduce our work on circular multiple scattering in plasmonic spiral structures and demonstrate broadband light emission enhancement, solar cell energy harvesting, and the manipulation of the Orbital Angular Momentum (OAM) of light using metallic and dielectric planar arrays, which is relevant to a number of applications in singular optics, secure communication, classical and quantum cryptography. Finally, I will present our recent work on the engineering of novel active Si-compatible materials and light sources that leverage photonic-plasmonic coupling on a Si chip. In particular, I will discuss coaxial dielectric slots and Metal-Insulator-Metal (MIM) nanocavities. Both structures support nanoscale localized modes that significantly enhance the radiation rate of Er ions at 1.54μm, enabling the manipulation of spontaneous emission at multiple frequencies for more efficient and compact light sources on Si.

 Host: Dean Philippe Fauchet


Luca Dal Negro
 
Vanderbilt University