Abstract
Connecting lumped circuit elements in a conventional circuit is usually accomplished by conducting wires that act as conduits for the conduction currents with negligible potential drops. More challenging, however, is to extend these concepts to optical nanocircuit elements. Here, following our recent development of optical lumped circuit elements, we show how a special class of nanowaveguides formed by a thin core with relatively large (positive or negative) permittivity surrounded by a thin concentric shell with low permittivity may provide the required analogy to 'wires' for optical nano-circuits.
Highlights
Interpreting light interaction with plasmonic nanostructures in terms of circuit models has been considered and discussed in the literature in the past
Connecting lumped circuit elements in a conventional circuit is usually accomplished by conducting wires that act as conduits for the conduction currents with negligible potential drops
Following our recent development of optical lumped circuit elements, we show how a special class of nanowaveguides formed by a thin core with relatively large permittivity surrounded by a thin concentric shell with low permittivity may provide the required analogy to ‘wires’ for optical nano-circuits
Summary
Interpreting light interaction with plasmonic nanostructures in terms of circuit models has been considered and discussed in the literature in the past (see, e.g., [1,2,3,4]). The role of nanoconnectors may be taken, in this nano-circuit analogy, by relatively large permittivity materials (relative ε -very-large, EVL, either positive or negative large permittivity), which may “connect” relatively distant optical nanoelements with a small potential drop, since for a given level of current Jd the corresponding longitudinal electric field, and the consequent voltage drop, are very low across the EVL connector Following these heuristic concepts [5,6,7,8,9], the representation of a complex nanocircuit system is getting closer to realization with feasible materials and technology at optical frequencies, i.e., employing naturally available plasmonic, non-plasmonic and/or polaritonic materials. Since ENZ and EVL materials may exist at infrared/optical frequencies [10] or they may be realized as layered metamaterials [11], realization of such optical nanowaveguides may be envisioned in the optical domains
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