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Flat-band localization and self-collimation of light in photonic crystals

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Title
Flat-band localization and self-collimation of light in photonic crystals
Author(s)
Myoung N.; Hee Chul Park; Ajith Ramachandran; Lidorikis E.; Jung-Wan Ryu
Publication Date
2019-02
Journal
SCIENTIFIC REPORTS, v.9, no.1, pp.2682 -
Publisher
NATURE PUBLISHING GROUP
Abstract
We investigate the optical properties of a photonic crystal (PC) composed of a quasi-one-dimensional flat-band lattice array through finite-difference time-domain simulations. The photonic bands contain flat bands (FBs) at specific frequencies, which correspond to compact localized states as a consequence of destructive interference. The FBs are shown to be nondispersive along the Г → X line, prohibiting optical transmission with incident light in x direction. On the other hand, the photonic band for the FB frequency is found to be dispersive along the Г → Y line, resulting in nonzero optical transmission. Such anisotropic optical response of the PC due to the FB localization of light in a single direction only results in a self-collimation of light propagation throughout the PC at the FB frequency. © 2019, The Author(s)
URI
https://pr.ibs.re.kr/handle/8788114/6028
ISSN
2045-2322
Appears in Collections:
Center for Theoretical Physics of Complex Systems(복잡계 이론물리 연구단) > Journal Papers (저널논문)
Files in This Item:
s41598-019-39471-0-2.pdfDownload

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