Source: http://aoot.osa.org/oe/abstract.cfm?uri=oe-25-26-32792
Timestamp: 2019-04-22 00:04:40+00:00

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The optical and magneto-optical behavior in periodically nanostructured surfaces at the threshold of surface continuity is revealed. We address Co films that evolve from an island-like array to a connecting network of islands that form a membrane pattern. The analysis of magneto-optical spectra as well as numerical simulations show significant differences between continuous and broken membranes that depend dramatically on the energy of the incoming radiation. Light localization increases the magneto-optical signal in the membranes. However, the generation of hot spots is not accompanied with magneto-optic enhancement. The electromagnetic field profile within the membrane system can explain the differences in the transmission and in the magneto-optic Kerr signal.
3 January 2018: A typographical correction was made to the author listing.
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Fig. 1 Scanning electron microscopy images for seven different Co films deposited on quartz substrates. The center to center distance is a = 470 nm. Only two samples with d = 373 nm and d = 300 nm present a continuous coverage. The rest of the samples have an island like shape. The percolation limit between isolated islands and connected islands lies around d values of d = 425, 413, 405 and 373 nm.
Fig. 2 (a) Experimental transmission spectra for the Co nanostructured thin films with different hole diameters. Clear extraordinary transmission peaks are observed for the continuous structure with d = 300 nm while there is gradually change of the shape of the spectra at the percolation limit. (b) Calculated transmission spectra for Co nanostructured thin films with different hole diameters as indicated. Filled symbols are for continuous membranes, and the open symbols are for the same structure but with a 60 nm gap breaking the bridges, resembling in such a way the islands.
Fig. 3 (a) Experimental polar Kerr rotation spectra for islands and membranes of diameter size from d = 300 to 445 nm. The Kerr rotation increases with decreasing the hole diameter. Opposite to the sharp changes in the transmission curves the Kerr spectra exhibit a more similar shape for both broken and unbroken membranes. (b) Simulated polar Kerr rotation versus photon energy for islands and membranes of diameter size d = 300, 400, 470 nm. Filled symbols refer to continuous membranes, and the open symbols correspond to the same structure but with a 60 nm gap breaking the bridges similar to Fig. 2(b).
Fig. 4 Calculated intensity of the electric field |E2| 10nm below the upper surface for unbroken (u) and for broken (b) membranes, for hole diameter sizes of d = 300, 400, 470 nm. (a) Low energy spectral region, where the incoming plane wave has an energy of 1.7 eV. Clear differences between unbroken and broken membranes can be clearly seen. (b) High energy spectral region (2.7 eV), where differences are actually very small.

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