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Photonic Bandgaps in Photonic MoleculesThis talk will focus on photonic bandgaps that arise due to nearly free photon and tight-binding effects in coupled microparticle and ring-resonator systems. The Mie formulation for homogeneous spheres is generalized to handle core/shell systems and multiple concentric layers in a manner that exploits an analogy with stratified planar systems, thereby allowing concentric multi-layered structures to be treated as photonic bandgap (PBG) materials. Representative results from a Mie code employing this analogy demonstrate that photonic bands arising from nearly free photon effects are easily observed in the backscattering, asymmetry parameter, and albedo for periodic quarter-wave concentric layers, though are not readily apparent in extinction spectra. Rather, the periodicity simply alters the scattering profile, enhancing the ratio of backscattering to forward scattering inside the bandgap, in direct analogy with planar quarter-wave multilayers. PBGs arising from tight-binding may also be observed when the layers (or rings) are designed such that the coupling between them is weak. We demonstrate that for a structure consisting of N coupled micro-resonators, the morphology dependent resonances split into N higher-Q modes, in direct analogy with other types of oscillators, and that this splitting ultimately results in PBGs which can lead to enhanced nonlinear optical effects.
Document ID
20030002635
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Smith, David D.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Chang, Hongrok
(Alabama Univ. Huntsville, AL United States)
Gates, Amanda L.
(Alabama Univ. Huntsville, AL United States)
Fuller, Kirk A.
(National Space Science and Technology Center Huntsville, AL United States)
Gregory, Don A.
(Alabama Univ. Huntsville, AL United States)
Witherow, William K.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Paley, Mark S.
(Universities Space Research Association Huntsville, AL United States)
Frazier, Donald O.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Curreri, Peter A.
Date Acquired
August 21, 2013
Publication Date
January 1, 2002
Subject Category
Atomic And Molecular Physics
Meeting Information
Meeting: Optics in the Southeast Conference
Location: Huntsville, AL
Country: United States
Start Date: October 24, 2002
End Date: October 26, 2002
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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