Abstract
Ag nanowire (NW) arrays with NW diameter d NW = 12–120 nm were electrodeposited in anodic aluminum oxide templates. Strong avalanche photoluminescence (PL) from Ag NW arrays with small d NW were observed near 914 nm by using picosecond laser at the excitation wavelength 808 nm, which is originated from the plasmon-enhanced radiative intraband transitions. The peak PL intensity of the avalanche PL from the sample with small diameter d NW = 12 nm is about 102 times stronger than that of the linear PL from the sample with large diameter d NW = 120 nm. The opposite excitation polarization dependence and emission polarization distribution of the PL from Ag NW array with d NW = 12 nm and d NW = 120 nm were also observed.
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