Towards verification of D-dot loop concept in optical regime

A very promising concept of an ‘optical wire’ (‘D-dot wire’) that replaces the flow of the conduction current with the flow of the displacement current has been introduced a few years ago (A. Alu and N. Engheta, All optical metamaterial circuit board at the nanoscale Phys. Rev. Lett., vol. 103, no. 14, p. 143902, 2009; B. Edwards and N. Engheta, Experimental Verification of Displacement-Current Conduits in Metamaterials-Inspired Optical Circuitry, Phys. Rev. Lett., vol. 108, no. 19, p. 193902 5p, 2012). Very recently, this concept has been extended to a so-called ‘D-dot loop’ that is actually a capacitive dual of a classical smali inductive loop antenna (elemental magnetic dipole). The ‘D-dot loop’ might find applications in future optical radiation and scattering systems. The basie idea has already been verified by scaled experiments in RF regime (B. Okorn, S. Hrabar, and J. Sancho-Parramon, Verification of concepts of D-dot wire and D-dot loop in RF regime, 2014 IEEE Int. Symp. Antennas Propag., 2014).