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Sensors 2014, 14(1), 272-282; doi:10.3390/s140100272
Article

Optical Sensing Using Dark Mode Excitation in an Asymmetric Dimer Metamaterial

1
,
2
,
1,*  and 1
1 CNR-SPIN and Physics Department, University of Naples Federico II, via Cinthia, Monte S. Angelo 80126, Napoli, Italy 2 CNR-SPIN, via Cinthia, Monte S. Angelo 80126, Napoli, Italy
* Author to whom correspondence should be addressed.
Received: 12 November 2013 / Revised: 13 December 2013 / Accepted: 16 December 2013 / Published: 24 December 2013
(This article belongs to the Section Physical Sensors)
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Abstract

We study the presence of dark and bright modes in a planar metamaterial with a double rod unit cell introducing geometric asymmetry in rod lengths. The dark mode displays a Fano-type resonance with a sharp asymmetric profile, rendering it far more sensitive than the bright mode to slight variations of the dielectric environment. This peculiar feature may envisage the possible application of the asymmetric dimer metamaterial as an optical sensor for chemical or biological analysis, provided that the effect of material losses on the dark mode quality factor is properly taken into account.
Keywords: metamaterials; Fano resonance; dimer sensor metamaterials; Fano resonance; dimer sensor
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Omaghali, N.E.J.; Tkachenko, V.; Andreone, A.; Abbate, G. Optical Sensing Using Dark Mode Excitation in an Asymmetric Dimer Metamaterial. Sensors 2014, 14, 272-282.

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