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Opt Lett. 2008 Jun 1;33(11):1261-3.

Low threshold gain metal coated laser nanoresonators.

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  • 1Department of Electrical and Computer Engineering, University of California San Diego, La Jolla, CA 92093-0407, USA.


We introduce a low refractive index layer between the metal and the gain medium in metal-coated laser resonators and demonstrate that it can significantly reduce the dissipation losses. Analysis of a gain medium waveguide shows that for a given waveguide radius, the low index layer has an optimal thickness for which the lasing threshold gain is minimal. The waveguide analysis is used for the design of a novel three-dimensional cylindrical resonator that is smaller than the vacuum wavelength in all three dimensions and exhibits a low enough threshold gain to lase at room temperature.

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