Abstract
We demonstrate that surface waves in structured perfect electric conductor surfaces can be self-collimated using the finite-difference time-domain method. The self-collimation frequency is obtained from the equi-frequency contours of a perfect electric conductor patterned with an array of square holes. The field patterns of the self-collimated surface wave, obtained using the periodic boundary conditions, show that the surface waves propagate with almost no spreading. We also show that self-collimation phenomena can be observed for the hybrid surface plasmon waves in structured metal surfaces using the finite-difference time-domain method with the Drude model. It is shown that for a structured silver surface the self-collimation can be achieved at the frequencies in the infrared region.
Highlights
Since Ebbesen et al reported the observation of extraordinary transmission of light through a subwavelength array of holes in a metal film, the interest in the interaction of light and metal films has increased remarkably [1]
The surface wave mode in the structured perfect electric conductor (PEC) and its dispersion relation are very important in that it can give designers a chance of controlling the dispersion properties. It is well-known that the self-collimated propagation and the negative refraction of light beam can be achieved in photonic crystals (PhCs) due to the dispersive properties of PhCs [12, 13]
We show that the self-collimation phenomena occurs in PECs with a periodic array of holes by analyzing their band structures and equi-frequncy contours (EFCs)
Summary
Since Ebbesen et al reported the observation of extraordinary transmission of light through a subwavelength array of holes in a metal film, the interest in the interaction of light and metal films has increased remarkably [1]. The surface wave mode in the structured PEC and its dispersion relation are very important in that it can give designers a chance of controlling the dispersion properties It is well-known that the self-collimated propagation and the negative refraction of light beam can be achieved in photonic crystals (PhCs) due to the dispersive properties of PhCs [12, 13]. We show that the self-collimation phenomena occurs in PECs with a periodic array of holes by analyzing their band structures and EFCs. we present that the selfcollimation of light occurs in a structured metal surface using the FDTD method to which the Drude model is applied
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