Fundamental limitations to gain enhancement in periodic media and waveguides

Details Fundamental limitations to gain enhancement in periodic media and waveguides Fundamental limitations to gain enhancement in periodic media and waveguides

2012-02-22

arxiv.org/abs/1202.4911v1

Physics

Optics

Scientific paper

A common strategy to compensate for losses in optical nanostructures is to add gain material in the system. By exploiting slow-light effects it is expected that the gain may be enhanced beyond its bulk value. Here we show that this route cannot be followed uncritically: inclusion of gain inevitably modifies the underlying dispersion law, and thereby may degrade the slow-light properties underlying the device operation and the anticipated gain enhancement itself. This degradation is generic; we demonstrate it for three different systems of current interest (coupled resonator optical waveguides, Bragg stacks, and photonic crystal waveguides). Nevertheless, a small amount of added gain may be beneficial.

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