Monday, December 3, 2012

1211.7260 (Silvio Savoia et al.)

Aperiodic-Order-Assisted Optical Nonlocality in Multilayered Hyperbolic
Metamaterials
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Silvio Savoia, Giuseppe Castaldi, Vincenzo Galdi
We show that hyperbolic electromagnetic metamaterials implemented as multilayers based on two material constituents arranged according to Thue-Morse aperiodic sequence may exhibit strong nonlocal effects, manifested as the appearance of additional extraordinary waves which are not predicted by standard effective-medium-theory (local) models. These effects can be associated with stationary points of the transfer-matrix trace, and can be effectively parameterized via the trace-map formalism. Interestingly, for certain parameter configurations, at a given wavelength and for two given material layers, these effects may disappear when the same layers are arranged in a standard periodic fashion, thereby providing a striking evidence of the major role played by aperiodic order. Our findings indicate that the (aperiodic) positional order of the layers constitutes an effective and technologically inexpensive additional degree of freedom in the engineering of optical nonlocality.
View original: http://arxiv.org/abs/1211.7260

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