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Spontaneous emission in long-range surface plasmon-polariton amplifiers

by: Israel De Leon, Pierre Berini
Physical Review B, Vol. 83, No. 8. (Feb 2011), 081414, doi:10.1103/physrevb.83.081414  Key: citeulike:8886240

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Abstract

Measurements of amplified spontaneous emission are conducted on a long-range surface plasmon-polariton amplifier consisting of a symmetric metallic waveguide incorporating a gain medium in the form of optically pumped dye molecules in solution. An effective input noise power per unit bandwidth of 7.47×10-4 fW/Hz is measured at λ=876 nm, which is 3.3 times larger than the theoretical minimum for phase-insensitive optical amplifiers. A semiclassical theoretical model describing the amplified spontaneous emission of long-range surface plasmonpolaritons (and other types of surface plasmon modes) is proposed, finding good agreement with experimental results. It is shown that the amplifier’s low noise follows from a low spontaneous emission rate of long-range surface plasmonpolaritons.


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