Abstract
A novel type of a plasmonic sensor based on a magnetophotonic plasmonic heterostructure with an ultrahigh-Q resonance is considered. A magnetoplasmonic resonance with an angular width of 0.06°, which corresponds to a Q factor of 700 and is a record value for magnetoplasmonic sensors, is experimentally demonstrated. It is shown that, owing to the excitation of long-propagation-range plasmons, the transverse magneto-optical Kerr effect is considerably enhanced and, thus, the sensitivity of the magnetoplasmonic sensor to variations in the refractive index increases to 18 RIU–1, where RIU is the refractive index unit. Numerical calculations indicate that the parameters of the magnetoplasmonic structure can be further optimized to attain sensitivities up to 5 × 103 RIU–1.
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Original Russian Text © D.O. Ignatyeva, P.O. Kapralov, G.A. Knyazev, S.K. Sekatskii, G. Dietler, M. Nur-E-Alam, M. Vasiliev, K. Alameh, V.I. Belotelov, 2016, published in Pis’ma v Zhurnal Eksperimental’noi i Teoreticheskoi Fiziki, 2016, Vol. 104, No. 10, pp. 689–694.
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Ignatyeva, D.O., Kapralov, P.O., Knyazev, G.A. et al. High-Q surface modes in photonic crystal/iron garnet film heterostructures for sensor applications. Jetp Lett. 104, 679–684 (2016). https://doi.org/10.1134/S0021364016220094
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DOI: https://doi.org/10.1134/S0021364016220094