Flatness and boundness of photonic drumhead surface state in a metallic lattice

Abstract Nodal chain (NC) semi-metals have the degeneracy of interlacing rings in their band structure in momentum space. With the projection of degenerate rings towards crystal boundaries, there is a special type of surface dispersion appearing at surface Brillouin zone and termed drumhead surface...

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Auteurs principaux:	Yu Wang, Xiaoxi Zhou, Shanshan Li, Wenya Zhang, Chuandeng Hu, Weixin Lu, Bo Hou
Format:	article
Langue:	EN
Publié:	Nature Portfolio 2021
Sujets:	Medicine R Science Q
Accès en ligne:	https://doaj.org/article/6c49341b8e804fe0ade6725089b15e3f
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id	oai:doaj.org-article:6c49341b8e804fe0ade6725089b15e3f
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spelling	oai:doaj.org-article:6c49341b8e804fe0ade6725089b15e3f2021-12-02T17:32:57ZFlatness and boundness of photonic drumhead surface state in a metallic lattice10.1038/s41598-021-88004-12045-2322https://doaj.org/article/6c49341b8e804fe0ade6725089b15e3f2021-04-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-88004-1https://doaj.org/toc/2045-2322Abstract Nodal chain (NC) semi-metals have the degeneracy of interlacing rings in their band structure in momentum space. With the projection of degenerate rings towards crystal boundaries, there is a special type of surface dispersion appearing at surface Brillouin zone and termed drumhead surface state (DSS). Previously, experimental investigations on photonic NC and DSS have been done on metallic photonic crystals at microwave frequencies. However, far-field detection of DSS and its coupling to radiative modes in free space have not been studied. In the work, we analyze the photonic DSS in a metallic lattice by angle-resolved far-field reflection measurement and numerical simulation at terahertz (THz) frequencies, and reveal its flatness and boundness in band structure, even in the radiation continuum. Particularly, the DSS band can be tuned being from negatively dispersive via flat to positively dispersive by a single surface parameter, and the DSS at Γ point in surface Brillouin zone is in fact a symmetry-protected bound state in the continuum. Our results might have some potential applications towards THz photonics.Yu WangXiaoxi ZhouShanshan LiWenya ZhangChuandeng HuWeixin LuBo HouNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-7 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Yu Wang Xiaoxi Zhou Shanshan Li Wenya Zhang Chuandeng Hu Weixin Lu Bo Hou Flatness and boundness of photonic drumhead surface state in a metallic lattice
description	Abstract Nodal chain (NC) semi-metals have the degeneracy of interlacing rings in their band structure in momentum space. With the projection of degenerate rings towards crystal boundaries, there is a special type of surface dispersion appearing at surface Brillouin zone and termed drumhead surface state (DSS). Previously, experimental investigations on photonic NC and DSS have been done on metallic photonic crystals at microwave frequencies. However, far-field detection of DSS and its coupling to radiative modes in free space have not been studied. In the work, we analyze the photonic DSS in a metallic lattice by angle-resolved far-field reflection measurement and numerical simulation at terahertz (THz) frequencies, and reveal its flatness and boundness in band structure, even in the radiation continuum. Particularly, the DSS band can be tuned being from negatively dispersive via flat to positively dispersive by a single surface parameter, and the DSS at Γ point in surface Brillouin zone is in fact a symmetry-protected bound state in the continuum. Our results might have some potential applications towards THz photonics.
format	article
author	Yu Wang Xiaoxi Zhou Shanshan Li Wenya Zhang Chuandeng Hu Weixin Lu Bo Hou
author_facet	Yu Wang Xiaoxi Zhou Shanshan Li Wenya Zhang Chuandeng Hu Weixin Lu Bo Hou
author_sort	Yu Wang
title	Flatness and boundness of photonic drumhead surface state in a metallic lattice
title_short	Flatness and boundness of photonic drumhead surface state in a metallic lattice
title_full	Flatness and boundness of photonic drumhead surface state in a metallic lattice
title_fullStr	Flatness and boundness of photonic drumhead surface state in a metallic lattice
title_full_unstemmed	Flatness and boundness of photonic drumhead surface state in a metallic lattice
title_sort	flatness and boundness of photonic drumhead surface state in a metallic lattice
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/6c49341b8e804fe0ade6725089b15e3f
work_keys_str_mv	AT yuwang flatnessandboundnessofphotonicdrumheadsurfacestateinametalliclattice AT xiaoxizhou flatnessandboundnessofphotonicdrumheadsurfacestateinametalliclattice AT shanshanli flatnessandboundnessofphotonicdrumheadsurfacestateinametalliclattice AT wenyazhang flatnessandboundnessofphotonicdrumheadsurfacestateinametalliclattice AT chuandenghu flatnessandboundnessofphotonicdrumheadsurfacestateinametalliclattice AT weixinlu flatnessandboundnessofphotonicdrumheadsurfacestateinametalliclattice AT bohou flatnessandboundnessofphotonicdrumheadsurfacestateinametalliclattice
_version_	1718380125525901312

Flatness and boundness of photonic drumhead surface state in a metallic lattice

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