title: Universal anti-reflection blocks for 4-port periodic microresonator structures.
abstract: We introduce universal "anti-reflection blocks" for periodic microresonator sequences consisting of 4-port unit cells. When added to the end of a finite periodic sequence, the anti-reflection block can eliminate the reflectivity at a given frequency ωref and significantly reduce it in a frequency range around ωref. These anti-reflection blocks are universal: By adjusting only their characteristic parameters, they can be made applicable to any 4-port periodic sequence, regardless of the detailed inside structure of its unit cells, at any frequency within the photonic bands.
authors.affiliation: College of Physical Science and Information Technology, Liaocheng University, Liaocheng, Shandong, 252000 China. yangzhenshan@lcu.edu.cn
authors.forename: Zhenshan
authors.initials: Z
authors.lastname: Yang
authors.forename: J E
authors.initials: JE
authors.lastname: Sipe