The guiding properties of a symmetric conductor–gap–dielectric system consists of a metal film symmetrically surrounded by media of two dielectrics, and is theoretically analyzed by using the quantum hydrodynamic model and Maxwell’s equations. We found that the quantum effects, including the Fermi pressure and the Bohm potential, facilitate the propagation of the hybrid surface waves at higher values of the wavenumber. The results show that the permittivity of the surrounding dielectric mediums and the geometric effects (namely, the thickness of the metal film and gap layers) significantly modify the basic behaviors of the hybrid surface waves. Our results provide a good understanding of the basic features of the wave propagation phenomenon in hybrid waveguide systems.

对称的导体－间隙－电介质系统的导引特性由被两个电介质介质对称围绕的金属膜组成，并通过使用量子流体动力学模型和麦克斯韦方程组进行了理论分析。我们发现量子效应，包括费米压力和波姆势，促进了杂波表面波在更高波数值下的传播。结果表明，周围介电介质的介电常数和几何效应（即金属膜和间隙层的厚度）显着改变了混合表面波的基本行为。我们的结果很好地理解了混合波导系统中波传播现象的基本特征。