Acoustic and photonic topological insulators by topology optimization

Rasmus E. Christiansen*, Fengwen Wang, Søren Stobbe, Ole Sigmund

*Corresponding author for this work

    Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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    Abstract

    The preliminary study reported here investigates if unit-cell inclusion-symmetries may be broken in time-reversalinvariant topological insulator designs, while maintaining the desired global behaviour of pseudo-spin-dependent edge state based bi-directional, back-scattering robust, energy propagation. By allowing symmetries to be broken additional geometrical design freedom is attained, which may turn out to enable an improvement of various performance measures such as bandwidth and field confinement. The particular study considers a time-reversal-invariant acoustic topological insulator design, designed using a modified version of our recently proposed topology optimization based method for designing photonic and acoustic topological insulators.1 This method relies on a carefully constructed model system combined with the application of density based topology optimization to design two carefully interfaced crystal phases to maximize the flow of energy through the system. Through simple modifications of the method, we demonstrate that it is possible to design structures with different symmetry conditions from those that have previously been investigated using the method.
    Original languageEnglish
    Title of host publicationProceedings of SPIE - Metamaterials, Metadevices, and Metasystems 2019
    EditorsNader Engheta, Mikhail A. Noginov, Nikolay I. Zheludev
    Number of pages7
    Volume11080
    PublisherSPIE - International Society for Optical Engineering
    Publication date2019
    Article number1108003
    DOIs
    Publication statusPublished - 2019
    EventSPIE Nanoscience + Engineering 2019 - San Diego, United States
    Duration: 11 Aug 201915 Aug 2019

    Conference

    ConferenceSPIE Nanoscience + Engineering 2019
    Country/TerritoryUnited States
    CitySan Diego
    Period11/08/201915/08/2019
    SeriesProceedings of SPIE - The International Society for Optical Engineering
    ISSN0277-786X

    Keywords

    • Topological insulators
    • Topology optimization
    • Nano photonics
    • Acoustics
    • Meta materials
    • Band gap structures

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