Physics – Optics
Scientific paper
2007-09-17
Phys. Rev. B 78, 035403 (2008)
Physics
Optics
Title changed and the paper significantly expanded. A.A.Govyadinov added to the author list. Accepted to Phys. Rev. B
Scientific paper
10.1103/PhysRevB.78.035403
We consider propagation of surface plasmon polaritons (SPPs) in linear periodic chains (LPCs) of prolate and oblate metallic spheroids. We show that the SPP group velocity can be efficiently controlled by varying the aspect ratio of the spheroids. For sufficiently small aspect ratios, a gap appears in the first Brillouin zone of the chain lattice in which propagating modes do not exist. depending on the SPP polarization, the gap extends to certain intervals of the Bloch wave number q. Thus, for transverse polarization, no propagating SPPs exist with wave numbers q such that q_c^\perp < | q | < \pi/h, h being the chain period. For longitudinally polarized SPPs, the gap spans the interval |q|
Govyadinov Alexander A.
Markel Vadim A.
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