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Helical assemblies of plasmonic nanorods as chiral metamaterials

Christofi, A. and Stefanou, N. and Gantzounis, G. and Papanikolaou, N. (2012) Helical assemblies of plasmonic nanorods as chiral metamaterials. In: Metamaterials VII. Proceedings of SPIE. No.8423. Society of Photo-Optical Instrumentation Engineers (SPIE) , Bellingham, WA, Art. No. 84230A. ISBN 978-0-8194-9115-2.

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We report on the optical properties of a layer-by-layer structure of silver nanorods, with their axes aligned perpendicular to the z direction and mutually twisted through an angle of 60° from layer to layer, by means of rigorous full electrodynamic calculations using the layer-multiple-scattering method, properly extended to describe axis-symmetric particles with arbitrary orientation. We analyze the complex photonic band structure of this crystal in conjunction with relevant polarization-resolved transmission spectra of finite slabs of it and explain the nature of the different eigenmodes of the electromagnetic field in the light of group theory. Our results reveal the existence of sizable polarization gaps and demonstrate the occurrence of strong optical activity and circular dichroism, combined with reduced dissipative losses, which make the proposed architecture potentially useful for practical applications as ultrathin circular polarizers and polarization rotators.

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Additional Information:© 2012 Society of Photo-Optical Instrumentation Engineers (SPIE). A. Christofi is supported by NCSR “Demokritos” through a postgraduate fellowship.
Funding AgencyGrant Number
National Centre of Scientific Research "Demokritos"UNSPECIFIED
Subject Keywords:multiple scattering method, complex photonic band structure, particle plasmon modes, chiral metamaterials
Series Name:Proceedings of SPIE
Issue or Number:8423
Record Number:CaltechAUTHORS:20161026-113324331
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Official Citation:A. Christofi ; N. Stefanou ; G. Gantzounis ; N. Papanikolaou; Helical assemblies of plasmonic nanorods as chiral metamaterials. Proc. SPIE 8423, Metamaterials VII, 84230A (May 1, 2012); doi:10.1117/12.918421.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71502
Deposited By: Ruth Sustaita
Deposited On:26 Oct 2016 19:01
Last Modified:11 Nov 2021 04:46

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