Abstract
The excitation of surface plasmons by subwavelength slits in metal films is studied using a rigorous diffraction model. It is shown that the plasmon is launched by a slit in antiphase with the incident magnetic field. This is true independent of slit width and of the metal used. Using this phase information, maxima and minima in transmission are explained in the case of two and more slits.
Highlights
Surface plasmons [1, 2] are electromagnetic surface waves that are bound to the interface between a dielectric and a metal whose permittivity has a negative real part
This wave number is higher than the wave number of light in the dielectric so that plasmons are not excited by illuminating the interface
The electromagnetic near field is calculated using a finite element model (FEM) at a gold film perforated with slits
Summary
Surface plasmons [1, 2] are electromagnetic surface waves that are bound to the interface between a dielectric and a metal whose permittivity has a negative real part They exist only for the TM polarization, i.e. when the magnetic field is perpendicular to the plane of incidence. To accurately predicting the transmission maxima and minima in a two slit experiment, it explains the strong suppression of transmission in a film with more slits For this purpose, we use a rigorous diffraction model to study the amplitude and phase of the surface plasmons that are excited at slits in a gold film.
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