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Title: Interfacial topological photonics: broadband silicon waveguides for THz 6G communication and beyond
Authors: Tan, Yi Ji
Wang, Wenhao
Kumar, Abhishek
Singh, Ranjan
Keywords: Science::Physics
Issue Date: 2022
Source: Tan, 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.
Project: NRF-CRP23-2019-0005
Journal: Optics Express
Abstract: Topological 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.
ISSN: 1094-4087
DOI: 10.1364/OE.468010
DOI (Related Dataset): 10.21979/N9/ZLKSN9
Schools: School of Physical and Mathematical Sciences 
Organisations: Agency for Science, Technology and Research
Research Centres: Centre for Disruptive Photonic Technologies (CDPT) 
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.
Fulltext Permission: open
Fulltext Availability: With Fulltext
Appears in Collections:SPMS Journal Articles

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