Abstract
The coupling effects in bilayer thick metal (silver) films perforated with rectangular nanohole arrays are investigated using the finite-difference time-domain technique. Many interesting light phenomena are observed as the distance between the metal rectangular nanohole arrays varies. Coupling effects are found to play very important roles on the optical and electronic properties of bilayer metal rectangular nanohole arrays: antisymmetric coupling between surface plasmon polaritons near the top and bottom film plane, and antisymmetric coupling between localized surface plasmon resonances near the two long sides of the rectangular hole, are probably excited in each layer of bilayer metal rectangular nanohole arrays; antisymmetric and symmetric magnetic coupling probably occur between the metal rectangular nanohole arrays.
Highlights
Thin metal films perforated with subwavelength hole arrays[1] have attracted a great deal of attention, due both to its fundamental characters and potential applications based on surface plasmon,[2,3,4,5] since the discovery of the Extraordinary Optical Transmission (EOT).[1]
The coupling effects in bilayer thick metal films perforated with rectangular nanohole arrays are investigated using the finite-difference time-domain technique
Coupling effects are found to play very important roles on the optical and electronic properties of bilayer metal rectangular nanohole arrays: antisymmetric coupling between surface plasmon polaritons near the top and bottom film plane, and antisymmetric coupling between localized surface plasmon resonances near the two long sides of the rectangular hole, are probably excited in each layer of bilayer metal rectangular nanohole arrays; antisymmetric and symmetric magnetic coupling probably occur between the metal rectangular nanohole arrays
Summary
Thin metal films perforated with subwavelength hole arrays[1] have attracted a great deal of attention, due both to its fundamental characters and potential applications based on surface plasmon,[2,3,4,5] since the discovery of the Extraordinary Optical Transmission (EOT).[1]. Previous researches were mainly focused on thin metal films perforated with subwavelength hole arrays in the framework of extraordinary optical transmission, while our previous work revealed that many interesting light phenomena were observed in thick metal films perforated with nanohole arrays, and especially there are many important potential applications based on thick metal films perforated with rectangular nanohole arrays.[18,19] There is probably hybridization of localized surface plasmon resonances modes supported by metallic nanoholes, when neighboring metallic nanoholes interact, and the hybridization is mediated by the nearby metallic surface plasmon polaritons which gives marked differences in optical response compare to metallic nanoparticles; at the same time, there are probably symmetric coupling mode and antisymmetric coupling mode between the top and down surface plasmon polaritons, mediated by those localized surface plasmon resonances modes, so a much richer range of optical phenomena probably present. Potential applications and origins of those optical properties will be discussed
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