Mimicking Electromagnetically Induced Transparency By Spoof Surface Plasmons

We analytically show how an electromagnetically induced transparency (EIT)-like spectral response is attained by using spoof surface plasmons. We propose prism-coupled double-layer slit arrays to achieve this. The reflection spectrum from this system has a nonabsorbing window between the symmetric and antisymmetric spoof surface plasmon resonances due to the destructive interference of the spoof surface plasmons on over-and under-layer slit arrays. The optical pulse is significantly delayed inside this nonabsorbing window as it is in other EIT systems. Through the formal equivalence between the coupled spoof surface plasmons on slit arrays and the coupled whispering gallery modes inside the microspheres, the relation between our system and the coupled resonator induced transparency (CRIT) system is clarified.