Long-range surface plasmons on duplex metal nanolayers

• Published in: Photonics and nanostructures 2020-05, Vol.39, p.100788, Article 100788
• Main Author: Konopsky, Valery N.
• Format: Article
• Language: English
• Subjects: Dielectrics; Electroluminescence; Long-range surface plasmons; Multilayers; Photonic crystal waveguides; Photonic crystals; Planar structures; Plasmons
• ISSN: 1569-4410; 1569-4429
• DOI: 10.1016/j.photonics.2020.100788

•Planar structures with two metal layers supporting long-range plasmons are presented.•The calculations of the optimal film thicknesses in these structures are given.•A method for designing such LRSP-supporting duplex metal structures is described. Planar structures with two metal nanolayers supporting long-range surface plasmons (LRSPs) are described. We introduce a design where a one-dimensional photonic crystal (1D PC) is used as a support for a planar dielectric film sandwiched between two metal nanolayers. This quasisymmetric design is compared with a symmetric where two metal nanolayers deposited on opposite sides of the planar dielectric film have the same semi-infinite dielectric environment from both sides. Such multilayer structures are useful when electrical power is supplied to the planar film through LRSP-supporting metal nanolayers on opposite sides of the film. This planar film may be, for example, an electro-optical crystal or an (organic) electroluminescent film. A method for designing such LRSP-supporting duplex metal structures based on an impedance approach is presented. Calculations of the optimal thickness for the metal-bounded dielectric film, which provides minima of optical field inside the metal nanolayers, are given for both symmetric and quasisymmetric cases.