Controllable electromagnetic transmission based on dual-metallic grating structures composed of subwavelength slits

摘要

Electromagnetic (EM) transmission through dual-metallic grating (DMG) structures composed of slits arrays, with the longitudinal interval G and the lateral displacement L, is investigated by using the finite-difference time-domain method. The results show that the EM transmission property can be controlled by changing G or/and L, such as tunable wavelength of high transmission, changeable transmittance for a special wavelength, and suppressed EM transmission over a broad spectral range. The DMG structures have potential applications in the future photonics. In addition, some advantages of DMGs with respect to the single-metallic gratings are also discussed.