Dispersion Relations; Magnetic Fields; Nematic Liquid Crystals; Nanoparticles; Plasmons
Abstract :
[en] We calculate the dispersion relations of plasmonic waves propagating along a chain of semiconducting or metallic nanoparticles in the presence of both a static magnetic field B and a liquid crystalline host. The dispersion relations are obtained using the quasistatic approximation and a dipole-dipole approximation to treat the interaction between surface plasmons on different nanoparticles. For plasmons propagating along a particle chain in a nematic liquid crystalline host with both B and the director parallel to the chain, we find a small, but finite, Faraday rotation angle. For B perpendicular to the chain, but director still parallel to the chain, the field couples the longitudinal and one of the two transverse plasmonic branches. This coupling is shown to split the two branches at the zero field crossing by an amount proportional to |B||B|. In a cholesteric liquid crystal host and an applied magnetic field parallel to the chain, the dispersion relations for left- and right-moving waves are found to be different. For some frequencies, the plasmonic wave propagates only in one of the two directions.
Disciplines :
Physics
Author, co-author :
Pike, Nicholas ; Université de Liège > Département de physique > Physique des matériaux et nanostructures
Stroud, David
Language :
English
Title :
Faraday rotation, band splitting, and one-way propagation of plasmon waves on a nanoparticle chain
Publication date :
March 2016
Journal title :
Journal of Applied Physics
ISSN :
0021-8979
eISSN :
1089-7550
Publisher :
American Institute of Physics, Melville, United States - New York
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