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dc.contributor.authorTan, Yi Jien_US
dc.contributor.authorWang, Wenhaoen_US
dc.contributor.authorKumar, Abhisheken_US
dc.contributor.authorSingh, Ranjanen_US
dc.identifier.citationTan, Y. J., Wang, W., Kumar, A. & Singh, R. (2022). Interfacial topological photonics: broadband silicon waveguides for THz 6G communication and beyond. Optics Express, 30(18), 33035-33047.
dc.description.abstractTopological photonics has expanded our understanding of electromagnetic wave propagation and unraveled new methods of electromagnetic wave shaping. Among the various topological photonic systems, valley photonic crystal (VPC) is a highly versatile platform for constructing interfaces that supports unidirectional edge state to enable the robust topological transport of light. Although silicon VPC waveguides has demonstrated the lossless propagation of terahertz (THz) waves through multiple sharp bends, existing designs are mostly based on the standard zigzag-interface. Here, we explore interfacial topological photonics by designing a composite interface junction for an air-slot-like VPC waveguide with a 60° bend and an unchanging bearded-interface to allow the topologically protected propagation of THz waves over a 20% relative bandwidth. We employ particle swarm optimization to design the geometry of a bearded-interface silicon VPC waveguide to achieve a 42% relative bandgap and a topological edge state spanning a usable 25% relative bandwidth. Our work illustrates the prospects and challenges of interfacial topological photonics in the design of broadband silicon topological waveguides for potential applications across the electromagnetic spectrum, including the on-chip THz sixth-generation (6G) communication.en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofOptics Expressen_US
dc.rights© 2022 Optica Publishing Group under the terms of the OSA Open Access Publishing Agreement. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for noncommercial purposes and appropriate attribution is maintained. All other rights are reserved.en_US
dc.titleInterfacial topological photonics: broadband silicon waveguides for THz 6G communication and beyonden_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.organizationAgency for Science, Technology and Researchen_US
dc.contributor.researchCentre for Disruptive Photonic Technologies (CDPT)en_US
dc.description.versionPublished versionen_US
dc.subject.keywordsTopological Photonicsen_US
dc.subject.keywordsSilicon Waveguideen_US
dc.subject.keywordsValley Photonic Crystalsen_US
dc.subject.keywords6G Communicationen_US
dc.description.acknowledgementYJ Tan acknowledges the A*STAR Graduate Scholarship funding from the Agency for Science, Technology and Research, Singapore. The authors also acknowledge the funding support from the National Research Foundation, Singapore (Grant No. NRF-CRP23-2019-0005).en_US
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