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Title: Topology-controlled photonic cavity based on the near-conservation of the valley degree of freedom
Authors: Li, Yandong
Yu, Yang
Liu, Fengyu
Zhang, Baile
Shvets, Gennady
Keywords: Science::Physics
Issue Date: 2020
Source: Li, Y., Yu, Y., Liu, F., Zhang, B., & Shvets, G. (2020). Topology-controlled photonic cavity based on the near-conservation of the valley degree of freedom. Physical Review Letters, 125(21), 213902-. doi:10.1103/PhysRevLett.125.213902
Journal: Physical Review Letters
Abstract: We demonstrate a novel path to localizing topologically nontrivial photonic edge modes along their propagation direction. Our approach is based on the near-conservation of the photonic valley degree of freedom associated with valley-polarized edge states. When the edge state is reflected from a judiciously oriented mirror, its optical energy is localized at the mirror surface because of an extended time delay required for valley index flipping. The degree of energy localization at the resulting topology-controlled photonic cavity is determined by the valley-flipping time, which is in turn controlled by the geometry of the mirror. Intuitive analytic descriptions of the "leaky" and closed topology-controlled photonic cavities are presented, and two specific designs-one for the microwave and the other for the optical spectral ranges-are proposed.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.125.213902
Rights: © 2020 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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