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Light modulation of nanostructured alumina anodic oxide thin film on sapphire

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3 Author(s)
Hsinwha Liu ; Chung Inst. of Technol., Nat. Defense Univ., Dasi, Taiwan ; Je-Chuang Wang ; Chen Hsu

The optical behaviour of nanostructured nanoporous alumina anodic oxide thin film (AAOF) on sapphires was investigated. The AAOF was intentionally nanostructured by varying the nanopore diameters, as a result, the distance between neighbour pores decreased. The resultant nanostructured nanoporous patterns cause super-paramagnetism and the excited photoluminescence splits into two wavelengths of near blue and green peaks. This light modulation could be related to the super-paramagnetic magnetisation of the patterns upon in nanoscale. With increasing the nanopore size by the reaming method, the super-paramagnetic susceptibility first decreases and then increases. Once the super-paramagnetic susceptibility deviates from that of the as-received AAOF, the green peak would be excited. On the other hand, strong super-paramagnetism facilitates excitation of the blue peak.

Published in:

Micro & Nano Letters, IET  (Volume:6 ,  Issue: 7 )