Abstract
In this work, we explore the existence of spoof surface plasmons (SSPs) supported by deep-subwavelength high-contrast gratings (HCGs) on a perfect electric conductor plane. The dispersion relation of the HCGs-based SSPs is derived analyt- ically by combining multimode network theory with rigorous mode matching method, which has nearly the same form with and can be degenerated into that of the SSPs arising from deep-subwavelength metallic gratings (MGs). Numerical simula- tions validate the analytical dispersion relation and an effective medium approximation is also presented to obtain the same analytical dispersion formula. This work sets up a unified theoretical framework for SSPs and opens up new vistas in surface plasmon optics.
Highlights
Surface plasmons (SPs) are the area of intense interest at optical frequencies[1,2,3]
We extend the concept of SSPs by demonstrating that high-contrast gratings (HCGs) on a perfect electric conductor (PEC) plane shown in Fig. 1(a) can support the propagation of SSPs both in two and three dimensions
We have demonstrated the existence of SSPs supported by deep-subwavelength HCGs on a PEC plane both in 2D and 3D cases
Summary
Surface plasmons (SPs) are the area of intense interest at optical frequencies[1,2,3]. Their ability to capture photons from far field into short wavelength surface excitations on metal surfaces offers the potential for controlling light on a deep-subwavelength scale. Using the resonant coupling of SPs to radiation modes through the HCGs on the surface of a thin metal slab makes it possible to implement novel surface plasmon resonance based functional devices[18,19,20] at optical frequencies. Three-dimensional (3D) domino-like[10] HCGs on a PEC plane is validated by dispersion relation and field distributions through simulations
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