Interfacial topological photonics: broadband silicon waveguides for THz 6G communication and beyond

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 u...

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Main Authors: Tan, Yi Ji, Wang, Wenhao, Kumar, Abhishek, Singh, Ranjan
Other Authors: School of Physical and Mathematical Sciences
Format: Article
Language:English
Published: 2022
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Online Access:https://hdl.handle.net/10356/161694
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Institution: Nanyang Technological University
Language: English
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spelling sg-ntu-dr.10356-1616942023-02-28T20:08:47Z Interfacial topological photonics: broadband silicon waveguides for THz 6G communication and beyond Tan, Yi Ji Wang, Wenhao Kumar, Abhishek Singh, Ranjan School of Physical and Mathematical Sciences Agency for Science, Technology and Research Centre for Disruptive Photonic Technologies (CDPT) Science::Physics Topological Photonics Silicon Waveguide Valley Photonic Crystals 6G Communication 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. National Research Foundation (NRF) Published version YJ 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). 2022-09-16T07:46:05Z 2022-09-16T07:46:05Z 2022 Journal Article 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. https://dx.doi.org/10.1364/OE.468010 1094-4087 https://hdl.handle.net/10356/161694 10.1364/OE.468010 18 30 33035 33047 en NRF-CRP23-2019-0005 Optics Express 10.21979/N9/ZLKSN9 © 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. application/pdf
institution Nanyang Technological University
building NTU Library
continent Asia
country Singapore
Singapore
content_provider NTU Library
collection DR-NTU
language English
topic Science::Physics
Topological Photonics
Silicon Waveguide
Valley Photonic Crystals
6G Communication
spellingShingle Science::Physics
Topological Photonics
Silicon Waveguide
Valley Photonic Crystals
6G Communication
Tan, Yi Ji
Wang, Wenhao
Kumar, Abhishek
Singh, Ranjan
Interfacial topological photonics: broadband silicon waveguides for THz 6G communication and beyond
description 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.
author2 School of Physical and Mathematical Sciences
author_facet School of Physical and Mathematical Sciences
Tan, Yi Ji
Wang, Wenhao
Kumar, Abhishek
Singh, Ranjan
format Article
author Tan, Yi Ji
Wang, Wenhao
Kumar, Abhishek
Singh, Ranjan
author_sort Tan, Yi Ji
title Interfacial topological photonics: broadband silicon waveguides for THz 6G communication and beyond
title_short Interfacial topological photonics: broadband silicon waveguides for THz 6G communication and beyond
title_full Interfacial topological photonics: broadband silicon waveguides for THz 6G communication and beyond
title_fullStr Interfacial topological photonics: broadband silicon waveguides for THz 6G communication and beyond
title_full_unstemmed Interfacial topological photonics: broadband silicon waveguides for THz 6G communication and beyond
title_sort interfacial topological photonics: broadband silicon waveguides for thz 6g communication and beyond
publishDate 2022
url https://hdl.handle.net/10356/161694
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