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.

描述了具有两个支持远程表面等离子体激元（LRSP）的金属纳米层的平面结构。我们介绍一种设计，其中使用一维光子晶体（1D PC）作为夹在两个金属纳米层之间的平面介电膜的支撑。将这种准对称设计与对称器件进行比较，在对称器件上，沉积在平面介电膜相对两侧的两个金属纳米层从两侧都具有相同的半无限电介质环境。当通过膜相对侧上的LRSP支撑金属纳米层向平面膜提供电能时，这种多层结构是有用的。该平面膜可以是例如电光晶体或（有机）电致发光膜。提出了一种基于阻抗方法设计这种支持LRSP的双金属结构的方法。