Abstract
We consider a zero-order diffraction metallic grating having two subwavelength
rectangular slits per period. The electromagnetic behavior of this system is studied
theoretically in the resonance spectral domain of the cavities. We show that, by
choosing judicious opto-geometrical parameters, we can perform the selective excitation
of one or the other category of cavities with a very appreciable quality factor,
illustrating then a switch effect. The results open the way to the quantitative light
addressing on passive metallic micro/nano-structures. In particular, for transmitting
gratings, we can force light to cross each subwavelength channel doublet through a
determined aperture, reconsidering in some extent the Young's slits experiment.
© 2008 IEEE
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