Topologically Protected Parametric Wavelength Conversion in a Valley Hall Insulator

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Topologically Protected Parametric Wavelength Conversion in a Valley Hall Insulator
Title:
Topologically Protected Parametric Wavelength Conversion in a Valley Hall Insulator
Journal Title:
Laser & Photonics Reviews
Publication Date:
10 May 2024
Citation:
Sohn, B., Choi, J. W., Chen, G. F. R., Gao, H., Mitchell, W. J., Ng, D. K. T., & Tan, D. T. H. (2024). Topologically Protected Parametric Wavelength Conversion in a Valley Hall Insulator. Laser & Photonics Reviews. Portico. https://doi.org/10.1002/lpor.202400045
Abstract:
AbstractNonlinear phenomena are investigated in a topological photonic valley Hall insulator (VHI) using a Kagome system designed to have localized topological boundary state (TBS) at telecommunications wavelengths. Valley Hall topologically protected nonlinear phenomena are demonstrated. Similar transmission properties and parametric wavelength conversion of up to −12 dB are experimentally achieved using sub‐milliwatt average powers in a zigzag interface without back‐scattering, compared with a straight interface. Furthermore, a 7 dB slow light enhancement is observed in the conversion efficiency near the red edge in the transmission band of the boundary state, demonstrating how slow light‐induced backscattering may be circumvented by leveraging the topologically protected boundary state. A Kerr‐induced delocalization of the valley Hall topological state (VHTS) is further experimentally observed, which can be harnessed to control the properties of topological edge states.
License type:
Publisher Copyright
Funding Info:
This research / project is supported by the Ministry of Education - ACRF Tier 2
Grant Reference no. : T2EP50121-0019

This research / project is supported by the A*STAR - MTC Grant
Grant Reference no. : M21K2c0119

This research / project is supported by the National Research Foundation - Quantum Engineering Programme Grant
Grant Reference no. : NRF2022-QEP2-01-P08

This research / project is supported by the National Research Foundation - Investigatorship Award
Grant Reference no. : NRF-NRFI08-2022-0003

This research / project is supported by the A*STAR - NA
Grant Reference no. : C220415015
Description:
This is the peer reviewed version of the following article: Sohn, B., Choi, J. W., Chen, G. F. R., Gao, H., Mitchell, W. J., Ng, D. K. T., & Tan, D. T. H. (2024). Topologically Protected Parametric Wavelength Conversion in a Valley Hall Insulator. Laser & Photonics Reviews. Portico. https://doi.org/10.1002/lpor.202400045, which has been published in final form at doi.org/10.1002/lpor.202400045. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited
ISSN:
1863-8880
1863-8899
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