Ignatyeva, D. O.Kapralov, P. O.Knyazev, G. A.Sekatskii, S. K.Dietler, G.Nur-E-Alam, M.Vasiliev, M.Alameh, K.Belotelov, V. I.2017-05-012017-05-012017-05-01201710.1134/S0021364016220094https://infoscience.epfl.ch/handle/20.500.14299/136724WOS:000394539300005A 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 0.06A degrees, 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 x 10(3) RIU-1.text::journal::journal article::research article