Title :
The Cantor dielectric fractal multilayer as an omnidirectional mirror
Author :
Chiadini, Francesco ; Fiumara, Vincenzo ; Gallina, Ilaria ; Scaglione, Antonio
Author_Institution :
Dept. of Electr. & Inf. Eng., Univ. of Salerno, Fisciano, Italy
Abstract :
Analysis of the reflecting features of Cantor dielectric multilayers for oblique incidence shows that, for suitable values of the refractive indexes of the two constituent materials, they behave as an omnidirectional mirror. The Cantor multilayer still keeps the characteristics of omnidirectional mirror also for lossy materials. The main effect of the material dissipation is to increase the minimum value of the dips delimiting the reflecting band and, consequently, to broaden the rejected frequency band. Comparison with a periodic quarter-wave stack having the same constituent materials points out that the Cantor multilayer has an higher rejection level with a narrower bandgap.
Keywords :
dielectric materials; fractals; light reflection; light refraction; mirrors; optical losses; optical multilayers; cantor dielectric fractal multilayer; lossy materials; material dissipation; narrow bandgap; oblique incidence; omnidirectional mirror; periodic quarter-wave stack; reflecting band; refractive index; Bandwidth; Dielectric materials; Fractals; Mirrors; Nonhomogeneous media; Optical materials; Optical refraction; Optical variables control; Reflectivity; Refractive index;
Conference_Titel :
Antenna Technology (iWAT), 2010 International Workshop on
Conference_Location :
Lisbon
Print_ISBN :
978-1-4244-4883-8
Electronic_ISBN :
978-1-4244-4885-2
DOI :
10.1109/IWAT.2010.5464921
