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Electromagnetic structures and devices based on manipulation of displacement current flow

This thesis is intended to contribute towards the practical implementation of optical nano-circuits with mutual interconnections similar to the architecture of electronic circuitry. Particularly, it discusses various electromagnetic structures for manipulation and guidance of a displacement current flow, based on a recently introduced concept of D-dot wire. It is shown analytically and numerically that a pair of D-dot wires acts as an analog of an ordinary transmission line, but with a very high characteristic impedance and extremely long wavelength. Aforementioned results have also been verified experimentally, by measurements on specially designed scaled radiofrequency replicas of D-dot-based structures. Furthermore, such a transmission line is modelled using an appropriate equivalent circuit that takes into account all physical mechanisms based on both displacement and conduction currents present in realistic implementations. In addition, it is shown that the streamlined flow of displacement current can cause radiation. Based on these findings, novel ‘optical’ loop-antenna and associate electromagnetic structures are proposed and their operation is verified numerically. Finally, a feasibility of direct experimental verification of the D-dot wire concept in optical regime is discussed and several practical recommendations are given.

metatronics, D-dot wire, optical nano-circuits

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