Abstract
In this study, a broadly tunable nanoporous thin film system with alternating layers of Ag/indium tin oxide (ITO)/CoFeB/ITO/Ag fabricated on a porous anodic aluminum oxide (AAO) substrate was presented, so as to achieve the flexible tailoring of the Fabry–Perot interference. The experimental results demonstrated that the amplitude of the Fabry–Perot interference of this system, which had only a Ag layer deposited on the AAO substrate, was 12 times higher than that of pure AAO film, aside from the tunable oscillation periods. This was mainly due to the fact that the Ag mirror greatly improved the reflectivity of the air/AAO interface, rendering the intensities of light reflected from the air/AAO and AAO/Al interfaces comparable, thereby forming an effective interference enhancement. Furthermore, the existence of the ferromagnetic CoFeB layer was capable of significantly improving the absorbance in the ultraviolet and visible spectral ranges, and in particularly, the oscillation ranges could be extended to ...
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