Abstract
We show that energy circulation within a pulse is possible when it propagates in a high-contrast dielectric nanowire. This process is accomplished through electromagnetic "wormhole" regions, in which the Poynting vector associated with the guided mode is negative with respect to the direction of propagation. For demonstration purposes this mechanism is elucidated in AlGaAs and silicon nanowaveguides. The effect of dispersion on the power circulation is also considered.
Highlights
Controlling the flow of light on a nanometer scale may have important implications in both science and technology [1]
In this paper we show, that in high-contrast dielectric optical nanowires, power circulation is possible during pulse propagation via negative energy-flux wormholes
In conclusion we have shown that that power circulation is possible during pulse propagation in high-contrast optical nanowires
Summary
Controlling the flow of light on a nanometer scale may have important implications in both science and technology [1]. An unusual effect associated with the electromagnetic properties of the fundamental HE11 mode in high-contrast dielectric rods was theoretically found by Gillespie in 1960 [12] This effect, which has so far received little if any attention, arises from the fact that in such high-contrast structures there can be two regions (close to the core-cladding boundary) where the Poynting vector is negative with respect to the direction of propagation. In this paper we show, that in high-contrast dielectric optical nanowires, power circulation is possible during pulse propagation via negative energy-flux wormholes. This phenomenon is universal since it occurs in a variety of waveguide geometries as long as the waveguide index-contrast exceeds a critical value. Methods to detect the presence of these negative energy-flux regions or wormholes are suggested
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