A silicon-on-insulator slab for topological valley transport

Nature Communications
Xin-Tao HeJian-Wen Dong

Abstract

Backscattering suppression in silicon-on-insulator (SOI) is one of the central issues to reduce energy loss and signal distortion, enabling for capability improvement of modern information processing systems. Valley physics provides an intriguing way for robust information transfer and unidirectional coupling in topological nanophotonics. Here we realize topological transport in a SOI valley photonic crystal slab. Localized Berry curvature near zone corners guarantees the existence of valley-dependent edge states below light cone, maintaining in-plane robustness and light confinement simultaneously. Topologically robust transport at telecommunication is observed along two sharp-bend interfaces in subwavelength scale, showing flat-top high transmission of ~10% bandwidth. Topological photonic routing is achieved in a bearded-stack interface, due to unidirectional excitation of valley-chirality-locked edge state from the phase vortex of a nanoscale microdisk. These findings show the prototype of robustly integrated devices, and open a new door towards the observation of non-trivial states even in non-Hermitian systems.

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Citations

Mar 15, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Zhi-Guo GengXue-Feng Zhu
Sep 7, 2019·Physical Review Letters·Sunil MittalMohammad Hafezi
Oct 2, 2019·Physical Review Letters·Daria SmirnovaYuri Kivshar
Jul 9, 2020·Physical Review Letters·Shirin AfzalVien Van
Jun 6, 2019·Optics Express·Shaolin KePeixiang Lu
Jul 2, 2019·Optics Letters·Hua ZhongZhigang Chen
May 2, 2020·Optics Letters·Hironobu YoshimiSatoshi Iwamoto
Jul 25, 2020·Light, Science & Applications·Daria SmirnovaYuri Kivshar
Sep 16, 2020·Optics Letters·Jianfeng ChenZhi-Yuan Li
Oct 21, 2020·Nature Nanotechnology·Xiaomei GaoLing Lu
Jan 15, 2021·Scientific Reports·Yongkang GongSang Soon Oh
Jan 30, 2021·Physical Review Letters·Guillermo ArreguiPedro David Garcia
Feb 2, 2021·Science Advances·Xiang XiXiankai Sun
Apr 27, 2021·Advanced Science·Sae Byeok JoJeong Ho Cho
Jun 10, 2021·Nature Communications·Jae-Hyuck ChoiMercedeh Khajavikhan
Jun 26, 2021·Physical Review Letters·Yang ChenXi-Feng Ren
Jul 21, 2021·Light, Science & Applications·Daria SmirnovaYuri Kivshar
Jul 28, 2021·Nano Letters·Hikaru SaitoTakumi Sannomiya
Sep 17, 2021·Nature Communications·Jian Wei YouTie Jun Cui
Mar 6, 2020··Xiao-Dong ChenXin-Tao He
Sep 14, 2020··Hongwei WangLu Sun

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Methods Mentioned

BETA
chips
chip
electron-beam lithography

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