Time-dependent high-contrast subwavelength resonators

JOURNAL OF COMPUTATIONAL PHYSICS

卷:445

Article

Ammari, Habib¹  Hiltunen, Erik Orvehed¹ 

[1] Swiss Fed Inst Technol, Dept Math, Ramistr 101, CH-8092 Zurich, Switzerland

关键词: Time-dependent materials;    Subwavelength resonance;    Exceptional points;    Dirac singularity at the origin;    Subwavelength phononic and photonic;    crystals;   

DOI  :  10.1016/j.jcp.2021.110594

来源: Elsevier

【 摘 要 】

In the field of metamaterials, many intriguing phenomena arise from having a structure which is periodic in space. In time-dependent structures, conceptually similar properties can arise, which nevertheless have fundamentally different physical implications. In this work, we study time-dependent systems in the context of subwavelength metamaterials. The main result is a capacitance matrix characterization of the band structure, which generalizes previous recent work on static subwavelength metamaterials. This characterization provides both theoretical insight and efficient numerical methods to compute the dispersion relationship of time-dependent structures. We exemplify this in several structures exhibiting interesting wave manipulation properties. (c) 2021 The Author(s). Published by Elsevier Inc. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).

【 授权许可】

Free