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approvedma___osi_2015___embedded_photonic_eigenstates.pdf2015-04-09 11:19:53Francesco Monticone


Author: Francesco Monticone
Requested Type: Oral
Submitted: 2015-04-09 11:23:08

Co-authors: Andrea Alu

Contact Info:
The University of Texas at Austin
1 University Station
Austin, Texas   78712
United States

Abstract Text:
As nanoscience and nanotechnology reach maturity, there is an increasing need for efficient ways to confine, localize and trap light, enhancing the optical interaction with nanostructures and boosting nonlinearities, quantum processes and surface effects. A moderately high degree of nanoscale light confinement has been achieved with plasmonic nanoantennas, high-index dielectric resonators, nanoparticle clusters, etc. However, since most nanostructures are electromagnetically open, a confined optical state tends to gradually lose its energy in the form of radiation loss, namely, by coupling with the radiation modes of the surrounding environment. This leads to lower near-field intensity and reduced oscillation lifetime, even in an ideal scenario without material absorption. Rather surprisingly, however, recent works have pointed out that it may actually be possible to design open structures that support ideally bound optical states with infinite Q factor, in which radiation loss vanishes despite the presence of compatible radiation channels in the background. In our talk, we present our recent research efforts on this topic, showing that such embedded eigenstates can be realized both in the form of localized optical states in composite nanoparticles and as guided modes on the surface of unbounded periodic structures, leading to extreme forms of light confinement and concentration.