Tunability of the reflection and the transmission spectra of two periodically corrugated metallic plates, obtained by control of the interactions between plasmonic and photonic modes

摘要

We theoretically study the interactions between plasmonic and photonic modeswithin a structure that is composed of two thin corrugated metallic plates,embedded in air. We show that the interactions depend upon the symmetry of theinteracting modes. This observation is explained by the phase differencebetween the Fourier components of the two gratings. The phase can be controlledby laterally shifting one grating with respect to the other. Therefore, thisrelative shift provides an efficient "knob" that allows to control theinteraction between the various modes, resulting in an efficient modulation oflight transmission and reflection in the proposed structure. Based on thisconcept we show that the investigated structure can be used as tunableplasmonic filter.