Low-threshold directional plasmon lasing assisted by spatially coherent surface plasmon polaritons

Details Low-threshold directional plasmon lasing assisted by spatially coherent surface plasmon polaritons Low-threshold directional plasmon lasing assisted by spatially coherent surface plasmon polaritons

2011-06-08

arxiv.org/abs/1106.3002v1

Physics

Optics

13 pages, 6 figures

Scientific paper

We theoretically propose directional, low-threshold plasmon lasing in both the near-infrared and visible wavelengths by utilizing spatially coherent surface plasmon polaritons on a meta-surface. The gain strength required for threshold lasing can be tuned down to a large extent through compatible structural parameters. Our calculations show that no more than 65 cm$^{-1}$ at 193.5 THz (1.55 $\mu$m) or 267 cm$^{-1}$at 474THz (0.633 $\mu$m) of gain coefficient is sufficient to compensate for the dissipation of metal films for threshold lasing; these values are smaller than any reported studies at the same frequencies. These findings present a planar solid-state route for plasmon lasing that is highly efficient and spatially coherent.

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