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

Optical Sensing Using Dark Mode Excitation in an Asymmetric Dimer Metamaterial

CNR-SPIN and Physics Department, University of Naples Federico II, via Cinthia, Monte S. Angelo 80126, Napoli, Italy
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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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 (CC BY 3.0).

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MDPI and ACS Style

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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