| ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Size effect on light propagation modulation near band edges in one-dimensional periodic structures |
| Yang Tang(唐洋), Jiajun Wang(王佳俊)†, Xingqi Zhao(赵星棋), Tongyu Li(李同宇), and Lei Shi(石磊)‡ |
| State Key Laboratory of Surface Physics, Key Laboratory of Micro-and Nano-Photonic Structures(Ministry of Education) and Department of Physics, Fudan University, Shanghai 200433, China |
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Abstract Periodic photonic structures can provide rich modulation in propagation of light due to well-defined band structures. Especially near band edges, light localization and the effect of near-zero refractive index have attracted wide attention. However, the practically fabricated structures can only have finite size, i.e., limited numbers of periods, leading to changes of the light propagation modulation compared with infinite structures. Here, we study the size effect on light localization and near-zero refractive-index propagation near band edges in one-dimensional periodic structures. Near edges of the band gap, as the structure's size shrinks, the broadening of the band gap and the weakening of the light localization are discovered. When the size is small, an added layer on the surface will perform large modulation in the group velocity. Near the degenerate point with Dirac-like dispersion, the zero-refractive-index effects like the zero-phase difference and near-unity transmittance retain as the size changes, while absolute group velocity fluctuates when the size shrinks.
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Received: 22 September 2022
Revised: 29 November 2022
Accepted manuscript online: 16 December 2022
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PACS:
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42.25.Bs
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(Wave propagation, transmission and absorption)
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| Fund: Project supported by the National Key Basic Research Program of China (Grant No. 2022YFA1404800), and the National Natural Science Foundation of China (Grant Nos. 12234007 and 12221004). L. S. was further supported by Science and Technology Commission of Shanghai Municipality, China (Grant Nos. 19XD1434600, 2019SHZDZX01, 19DZ2253000, 20501110500, and 21DZ1101500) |
Corresponding Authors:
Jiajun Wang, Lei Shi
E-mail: jjwang19@fudan.edu.cn;lshi@fudan.edu.cn
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Cite this article:
Yang Tang(唐洋), Jiajun Wang(王佳俊), Xingqi Zhao(赵星棋), Tongyu Li(李同宇), and Lei Shi(石磊) Size effect on light propagation modulation near band edges in one-dimensional periodic structures 2023 Chin. Phys. B 32 054201
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