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Filtering properties of defect-bearing periodic and triadic cantor multilayers |
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| Authors: | Francesco Chiadini Ilaria Gallina |
| Affiliation: | a Department of Electrical and Information Engineering, University of Salerno, via Ponte Don Melillo, Fisciano (SA) 84084, Italy b Department of Environmental Engineering and Physics, University of Basilicata, Viale dell’Ateneo Lucano 10, 85100 Potenza, Italy c The Waves Group, Department of Engineering, University of Sannio, Corso Garibaldi 107, Benevento 82100, Italy |
| Abstract: | Defect-bearing periodic as well as pre-fractal dielectric multilayers can be designed to operate as narrow-band filters. For the same dielectric constituents and the same (or closest to same) number of layers, pre-fractal structures are remarkably better than the periodic ones, both in terms of filter bandwidth and transmittance peak, and are less sensitive to variations in the defect thickness. For structures having about 30 layers, optical losses do not significantly affect the filtering features of both morphologies if the loss tangent of the constituent materials is less than 10−5. |
| Keywords: | 42.70.Qs 42.79.&minus e 42.79.Ci |
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