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Optical magnetic metamaterials based on thick metal film perforated with rectangular nanohole arrays

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Corresponding author: e-mail ylcx@mail.nwpu.edu.cn, Phone: +86 029-88492052, Fax: +86 029-88492052

Abstract

The dependence of the optical magnetic property on metal film thickness and the origin of the magnetic property in thick metal (silver) film perforated with rectangular nanohole arrays were investigated using the finite-difference time-domain technique. A negative permeability was observed in the thickness range where two hybridized magnetic plasmon polariton resonances are present, and a big negative permeability was observed at certain thickness when the antisymmetric coupling between the electrical current density near the top and bottom film plane with the directions of electrical current density in the plane are present. Two types of antisymmetric coupling of electrical current density in the metal film were found to probably contribute to the permeability.

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