文章基本信息

标题：Design of full-k-space flat bands in photonic crystals beyond the tight-binding picture
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作者：Changqing Xu ; Gang Wang ; Zhi Hong Hang 等
期刊名称：Scientific Reports
电子版ISSN：2045-2322
出版年度：2015
卷号：5
DOI：10.1038/srep18181
出版社：Springer Nature
摘要：Based on a band engineering method, we propose a theoretical prescription to create a full- k -space flat band in dielectric photonic crystals covering the whole Brillouin Zone. With wave functions distributed in air instead of in the dielectrics, such a flat band represents a unique mechanism for achieving flat dispersions beyond the tight-binding picture, which can enormously reduce the requirement of permittivity contrast in the system. Finally, we propose and numerically demonstrate a unique application based on the full- k -space coverage of the flat band: ultra-sensitive detection of small scatterers.