9 May 2012 Strong magnetic resonance of coupled aluminum nanodisks on top of a silicon waveguide
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We study the electromagnetic behavior of a structure consisting of coupled aluminum nanodisks on a silicon waveguide at telecom wavelengths. Numerical simulations show that the fundamental TE-like waveguide mode excites a localized magnetic plasmon resonance between adjacent nanodisks with suitable dimensions, leading to transmission dips. For a sufficient number of disks (periodically distributed along the propagation direction), the structure supports a magnetic mode arising from a magneto-inductive coupling between neighboring nanodisks, as revealed by an Eigenmode analysis. The transmission response of the samples was measured for both polarizations through an end-fire set-up, confirming that the strong resonances are only present for TE polarization. Measurements and simulations are in good agreement, showing that the resonances strength is maximized for three coupled nanodisks.
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Irene Alepuz-Benache, Irene Alepuz-Benache, Carlos García-Meca, Carlos García-Meca, Francisco J. Rodríguez-Fortuño, Francisco J. Rodríguez-Fortuño, Rubén Ortuño, Rubén Ortuño, María Lorente-Crespo, María Lorente-Crespo, Amadeu Griol, Amadeu Griol, Alejandro Martínez, Alejandro Martínez, "Strong magnetic resonance of coupled aluminum nanodisks on top of a silicon waveguide", Proc. SPIE 8424, Nanophotonics IV, 84242J (9 May 2012); doi: 10.1117/12.922300; https://doi.org/10.1117/12.922300

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