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Nature Research, Scientific Reports, 1(5), 2015

DOI: 10.1038/srep18181

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Design of full-k-space flat bands in photonic crystals beyond the tight-binding picture

Journal article published in 2015 by Changqing Xu, Gang Wang, Zhi Hong Hang, Jie Luo, Che Ting Chan ORCID, Yun Lai
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

AbstractBased 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.