| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Giant-tunable bidirectional Goos-Hänchen shifts via phase change material-based metasurfaces with quasi-bound states in continuum |
| Jiaqing Liu(刘佳晴)1, Yue Zheng(郑悦)1, Xiao Li(李潇)2,3, Jingwen Li(李静文)2,3, Guohao Zhang(张国昊)2,3, Daxing Dong(董大兴)2,3, Dongmei Liu(刘冬梅)1, Yuwen Jia(贾玉雯)1, Yangyang Fu(伏洋洋)2,3,†, and Youwen Liu(刘友文)2,3,‡ |
1 College of Science, North China University of Science and Technology, Tangshan 063210, China;
2 College of Physics, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China;
3 Key Laboratory of Aerospace Information Materials and Physics (NUAA), MIIT, Nanjing 211106, China |
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Abstract We propose a novel approach for investigating the tunable Goos-Hänchen (GH) shift via an all-dielectric metasurface that incorporates phase change materials (PCMs). By introducing material asymmetry through the reconfigurable characteristic of PCMs while maintaining fixed geometric parameters, we can achieve tunable dual quasi-bound states in the continuum with ultrahigh quality factors (Q factors). Enabled by such tunable dual modes with significant phase changes, the PCM-based metasurface exhibits giant-tunable bidirectional GH shifts compared to conventional metasurfaces. Notably, the GH shift exhibits multidimensional tunability, including PCM-driven switching (amorphous to crystalline), incident-angle dependence (${\theta}$), and wavelength selectivity (${\lambda}$). The maximum observed shift reaches approximately 10$^{4}$ wavelengths, accompanied by a corresponding Q factor of 10$^{7}$. Our work demonstrates its potential for applications in ultrahigh-precision multifunctional devices, from biosensing to reconfigurable nanophotonic switches.
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Received: 17 February 2025
Revised: 12 April 2025
Accepted manuscript online: 17 April 2025
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PACS:
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42.70.-a
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(Optical materials)
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42.79.Dj
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(Gratings)
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78.20.Ci
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(Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))
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78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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| Fund: Project supported by the National Natural Science Foundation of China (Grant No. 12274225), the Fundamental Research Funds for the Central Universities (Grant No. NS2023056), the Natural Science Foundation of Hebei Province, China (Grant No. B2024209014), and the Basic Scientific Research Project of Hebei Provincial Department of Education (Grant No. JJC2024059). |
Corresponding Authors:
Yangyang Fu, Youwen Liu
E-mail: yyfu@nuaa.edu.cn;ywliu@nuaa.edu.cn
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Cite this article:
Jiaqing Liu(刘佳晴), Yue Zheng(郑悦), Xiao Li(李潇), Jingwen Li(李静文), Guohao Zhang(张国昊), Daxing Dong(董大兴), Dongmei Liu(刘冬梅), Yuwen Jia(贾玉雯), Yangyang Fu(伏洋洋), and Youwen Liu(刘友文) Giant-tunable bidirectional Goos-Hänchen shifts via phase change material-based metasurfaces with quasi-bound states in continuum 2025 Chin. Phys. B 34 074208
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