Excitation of Bloch like surface waves in quasi crystals and aperiodic dielectric multilayers.
The existence of Bloch surface waves in periodic dielectric multilayer structures with a surface defect is well known. Not yet recognized is that quasi crystals and aperiodic dielectric multilayers can also support Bloch like surface waves. In this work, we numerically show the excitation of Bloch like surface waves in Fibonacci quasi crystals and Thue Morse aperiodic dielectric multilayers using the prism coupling method. We report improved surface electric field intensity and penetration depth of Bloch like surface waves in the air side in such structures compared to their periodic counterparts.
Optics letters