Abstract
Combination of micro-cavity and nano-metals using plasmonic effect may create novel optical devices for communications and optical sensing. In this paper, we study the green coherent emission from an erbium-doped silica microsphere pumped at infrared laser beam with wavelength of 976 nm, which can enhance by a metal coating such as gold, platinum, and aluminum. The case of aluminum coating is studied and the high enhancement shown to decrease with time. The threshold of narrow line-width up-conversion emission from erbium-doped Al-coated silica microsphere is of some tens nano-watt pump power. But after one month kept in air the green light emission threshold of this one increases up to mili-watts, that the enhancement is decreased down to some thousand times in comparison with platinum-coated microsphere as a film of aluminum oxide is formed. In addition, the spectra of green light emission from degraded aluminum-coated microsphere changed from single peak to double peaks that mean the cavity of silica microsphere may make from multi-layers.
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