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Metallic structures with periodic array of slits are well-known to lead toextraordinary power transmission, when slits have dimensions much less than thewavelength of incident optical wave. Excellent power transmission originatesfrom surface waves excited by incident transverse magnetic wave. Here we showthat metallic structure with array of stepped-slits can transmit power ofincident wave into the substrate at desired optical frequency entirely andsimultaneously in terahertz frequency band by 70%, for In0.53Ga0.47Assubstrate. Transmitted power of the proposed structure is studied both in aclosed-form by an analytical model as well as numerically by finite elementmethod. It is found that with the increase of field intensity in the substrate,structure with array of stepped-slits (as opposed to uniform-slits) favorablyhas no reduction of frequency range at maximum transmitted power.

Periodic metallic stepped-slits for entire transmission of optical wave and efficient transmission of terahertz wave