Journal
APPLIED PHYSICS LETTERS
Volume 96, Issue 18, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3425896
Keywords
metal-semiconductor-metal structures; optical waveguides; surface plasmon resonance
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Funding
- DARPA [W911NF-07-1-0314]
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The concept of confinement factor (CF) is analyzed for a metal-semiconductor-metal (MSM) waveguide near the surface plasmon resonance. We show that the CF is inversely proportional to the average energy velocity, and thus can be enhanced by the slowing down of energy propagation. This slowing down in the MSM waveguide results in a value of CF as high as 10(5), as opposed to a value of smaller than 1 in a typically dielectric structure. Contrary to the CF in pure dielectric waveguide where it is independent of material gain, the CF in MSM waveguide shows a resonancelike dependence on material gain near the surface plasmon resonance. (C) 2010 American Institute of Physics. [doi:10.1063/1.3425896]
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