Abstract
We propose a design method of diffractive slit patterns for focusing surface plasmon polaritons. A scalar model of surface plasmon polariton excitation and interference is adopted, based on which the design method of diffractive slit patterns is built up. The validity of the proposed scalar model-based design is discussed through the comparison of the simulation results of the scalar model and the rigorous three-dimensional vectorial electromagnetic model using the rigorous coupled wave analysis.
Highlights
Surface plasmon polariton (SPP) is an electromagnetic surface mode coupled with surface conduction electrons at metal dielectric interfaces
We propose a design method of diffractive slit patterns for focusing SPPs based on diffractive optics concept [11]
The validity of the proposed scalar model-based design is discussed through the comparison of the simulation results of the scalar model and the rigorous three-dimensional vectorial electromagnetic model using the rigorous coupled wave analysis (RCWA) [13, 14]
Summary
Surface plasmon polariton (SPP) is an electromagnetic surface mode coupled with surface conduction electrons at metal dielectric interfaces. Under the intuition that the SPP excitation strength is proportional to the inner product, p ⋅n , of the polarization, p , and the outer normal vector, n , at a local point on the slit as shown in Eq (5), the SPP interference pattern should take the form ( ) U ( x, y) = ∫ a ( x, y) exp jkSPP ( x − x′)2 + ( y − y′) p ⋅nds. We can obtain diffractive slit patterns for generating multiple SPP focal spots
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