Abstract
Purcell factor of a nanostrip plasmon waveguide is evaluated via a full integration form of Fermi's golden rule and power dissipation spectrum. Purcell factor is dramatically increased with narrower strip width, corresponding to the tight confinement in the ultrasmall gap region. Furthermore, inclusion of energy distribution among useful and lossy modes would reduce the Purcell factor severely, yet the enhancement range could be broadened and the tolerance of emission linewidth strengthened. Although the dissipation issue remains serious near the resonant frequency, it is shown that wide-linewidth emitters in the off-resonance region could also be effectively enhanced with nanostrip waveguide, suggesting a promising path to practical integrated emitters.
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