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Giant Optical Activity of Helical Architectures of Plasmonic Nanorods

Christofi, Aristi and Stefanou, Nikolaos and Gantzounis, Georgios and Papanikolaou, Nikolaos (2012) Giant Optical Activity of Helical Architectures of Plasmonic Nanorods. Journal of Physical Chemistry C, 116 (31). pp. 16674-16679. ISSN 1932-7447. doi:10.1021/jp304907s.

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A systematic study, by means of full electrodynamic calculations, of the optical activity of layer-by-layer chiral crystals of finite silver nanorods is presented. The nature of the eigenmodes of the electromagnetic field and the formation of partial gaps for a specific circular polarization in these crystals are analyzed by reference to the hybrid plasmon modes of the structural basis of twisted nanorods. It is shown that collective plasmon modes of the helical assembly give rise to giant optical activity effects, which persist for any angle of incidence and polarization direction. The effects, which are robust against the twisting angle and become more pronounced with increasing particle concentration, can be tuned within a broad range of frequencies in the infrared and visible spectrum by appropriately choosing the rod length. Potential applications of these structures for polarization control in subwavelength optical components are anticipated.

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Additional Information:© 2012 American Chemical Society. Received: May 21, 2012. Revised: July 3, 2012. Published: July 10, 2012. A.C. is supported by NCSR “Demokritos” through a postgraduate fellowship.
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Issue or Number:31
Record Number:CaltechAUTHORS:20121029-101813117
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Official Citation:Giant Optical Activity of Helical Architectures of Plasmonic Nanorods Aristi Christofi, Nikolaos Stefanou, Georgios Gantzounis, and Nikolaos Papanikolaou The Journal of Physical Chemistry C2012116 (31), 16674-16679
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:35148
Deposited By: Tony Diaz
Deposited On:29 Oct 2012 21:25
Last Modified:09 Nov 2021 23:13

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