Pulse Reshaping in Double-zero-index Photonic Crystals with Dirac-like-cone Dispersion

Abstract Triply-degenerate Dirac-like cone at the Brillouin zone center attracts much research interest in recent years. Whether the linear dispersion in such a Dirac-like cone reflects the same physics to Dirac cones at the Brillouin zone boundaries is still under investigation. In this manuscript,...

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Auteurs principaux:	Tao Xu, Dejun Zhu, Zhi Hong Hang
Format:	article
Langue:	EN
Publié:	Nature Portfolio 2020
Sujets:	Medicine R Science Q
Accès en ligne:	https://doaj.org/article/4c35954ada734bae93af50a4bb3fa35c
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spelling	oai:doaj.org-article:4c35954ada734bae93af50a4bb3fa35c2021-12-02T14:59:15ZPulse Reshaping in Double-zero-index Photonic Crystals with Dirac-like-cone Dispersion10.1038/s41598-020-65461-82045-2322https://doaj.org/article/4c35954ada734bae93af50a4bb3fa35c2020-05-01T00:00:00Zhttps://doi.org/10.1038/s41598-020-65461-8https://doaj.org/toc/2045-2322Abstract Triply-degenerate Dirac-like cone at the Brillouin zone center attracts much research interest in recent years. Whether the linear dispersion in such a Dirac-like cone reflects the same physics to Dirac cones at the Brillouin zone boundaries is still under investigation. In this manuscript, through microwave experiments and numerical simulations, we observe intriguing pulse reshaping phenomena in double-zero-index photonic crystals, which cannot be fully understood from their close-to-zero effective parameters. A reshaped pulse, with frequency components close to the Dirac frequency filtered, is propagating at a constant group velocity while part of these filtered frequencies appears at a much later time. In time domain measurements, we find a way to separate the effect between the linear dispersion and the extra flat band in Dirac-like cone to have a better understanding of the underneath physics. We succeed in obtaining the group velocity inside a double-zero-index photonic crystal and good consistence can be found between experiments, numerical simulations and band diagram calculations.Tao XuDejun ZhuZhi Hong HangNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 10, Iss 1, Pp 1-7 (2020)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Tao Xu Dejun Zhu Zhi Hong Hang Pulse Reshaping in Double-zero-index Photonic Crystals with Dirac-like-cone Dispersion
description	Abstract Triply-degenerate Dirac-like cone at the Brillouin zone center attracts much research interest in recent years. Whether the linear dispersion in such a Dirac-like cone reflects the same physics to Dirac cones at the Brillouin zone boundaries is still under investigation. In this manuscript, through microwave experiments and numerical simulations, we observe intriguing pulse reshaping phenomena in double-zero-index photonic crystals, which cannot be fully understood from their close-to-zero effective parameters. A reshaped pulse, with frequency components close to the Dirac frequency filtered, is propagating at a constant group velocity while part of these filtered frequencies appears at a much later time. In time domain measurements, we find a way to separate the effect between the linear dispersion and the extra flat band in Dirac-like cone to have a better understanding of the underneath physics. We succeed in obtaining the group velocity inside a double-zero-index photonic crystal and good consistence can be found between experiments, numerical simulations and band diagram calculations.
format	article
author	Tao Xu Dejun Zhu Zhi Hong Hang
author_facet	Tao Xu Dejun Zhu Zhi Hong Hang
author_sort	Tao Xu
title	Pulse Reshaping in Double-zero-index Photonic Crystals with Dirac-like-cone Dispersion
title_short	Pulse Reshaping in Double-zero-index Photonic Crystals with Dirac-like-cone Dispersion
title_full	Pulse Reshaping in Double-zero-index Photonic Crystals with Dirac-like-cone Dispersion
title_fullStr	Pulse Reshaping in Double-zero-index Photonic Crystals with Dirac-like-cone Dispersion
title_full_unstemmed	Pulse Reshaping in Double-zero-index Photonic Crystals with Dirac-like-cone Dispersion
title_sort	pulse reshaping in double-zero-index photonic crystals with dirac-like-cone dispersion
publisher	Nature Portfolio
publishDate	2020
url	https://doaj.org/article/4c35954ada734bae93af50a4bb3fa35c
work_keys_str_mv	AT taoxu pulsereshapingindoublezeroindexphotoniccrystalswithdiraclikeconedispersion AT dejunzhu pulsereshapingindoublezeroindexphotoniccrystalswithdiraclikeconedispersion AT zhihonghang pulsereshapingindoublezeroindexphotoniccrystalswithdiraclikeconedispersion
_version_	1718389197710032896

Pulse Reshaping in Double-zero-index Photonic Crystals with Dirac-like-cone Dispersion

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