Optical Response of Plasmonic Nanohole Arrays: Comparison of Square and Hexagonal Lattices
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11468_2015_Article_118.pdf
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Author(s)
Ekşioğlu, Yasa
Petráček, Jiří
Cetin, Arif Engin
Date Issued
October 2015
Journal
Plasmonics
Publisher
Springer US
Citation
Ekşioğlu, Yasa, Arif E. Cetin, and Jiří Petráček. “Optical Response of Plasmonic Nanohole Arrays: Comparison of Square and Hexagonal Lattices.” Plasmonics 11.3 (2016): 851–856.
Version
Author's final manuscript
Abstract
Nanohole arrays in metal films allow extraordinary optical transmission (EOT); the phenomenon is highly advantageous for biosensing applications. In this article, we theoretically investigate the performance of refractive index sensors, utilizing square and hexagonal arrays of nanoholes, that can monitor the spectral position of EOT signals. We present near- and far-field characteristics of the aperture arrays and investigate the influence of geometrical device parameters in detail. We numerically compare the refractive index sensitivities of the two lattice geometries and show that the hexagonal array supports larger figure-of-merit values due to its sharper EOT response. Furthermore, the presence of a thin dielectric film that covers the gold surface and mimics a biomolecular layer causes larger spectral shifts within the EOT resonance for the hexagonal array. We also investigate the dependence of the transmission responses on hole radius and demonstrate that hexagonal lattice is highly promising for applications demanding strong light transmission.
MIT Department
Massachusetts Institute of Technology. Department of Biological Engineering
Koch Institute for Integrative Cancer Research at MIT
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Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use.
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DOI of Published Version
https://doi.org/10.1007/s11468-015-0118-9
