https://doi.org/10.1140/epjd/s10053-025-01033-7
Regular Article - Optical Phenomena and Photonics
Topological rainbow trapping in gradient photonic structure for terahertz band
1
School of Physics and Materials Science, Nanchang University, 330031, Nanchang, China
2
Institute of Space Science and Technology, Nanchang University, 330031, Nanchang, China
Received:
29
March
2025
Accepted:
24
June
2025
Published online:
25
July
2025
The integration of topological principles with rainbow trapping techniques presents a transformative approach in photonic device design, particularly in developing photonic topological rainbow based on quantum Hall effect. In this paper, we propose a quantum spin Hall photonic crystal with gradient radius of circles to achieve topological rainbow trapping, demonstrating trapping effect within topological edge states through fine-tuning. Theoretical and numerical analyses show that the topological rainbow is capable of capturing photonic states across a range of frequencies. Moreover, by modulating the group velocity of the edge states, we can effectively direct the path of light propagation, enabling selective light trapping within specific regions. The strategy outlined in this study offers a universal approach to topological rainbow trapping, which is anticipated to significantly advance the research and development in the domain of topological photonic devices.
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© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2025
Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
