Size effect on light propagation modulation near band edges in one-dimensional periodic structures

doi:10.1088/1674-1056/acac0d

中国物理B ›› 2023, Vol. 32 ›› Issue (5): 54201-054201.doi: 10.1088/1674-1056/acac0d

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

收稿日期:2022-09-22 修回日期:2022-11-29 接受日期:2022-12-16 出版日期:2023-04-21 发布日期:2023-05-05
通讯作者: Jiajun Wang, Lei Shi E-mail:jjwang19@fudan.edu.cn;lshi@fudan.edu.cn
基金资助:
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)

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

Received:2022-09-22 Revised:2022-11-29 Accepted:2022-12-16 Online:2023-04-21 Published:2023-05-05
Contact: Jiajun Wang, Lei Shi E-mail:jjwang19@fudan.edu.cn;lshi@fudan.edu.cn
Supported by:
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)

摘要/Abstract

摘要： 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.

关键词: one-dimensional (1D) photonic crystal, finite-size effect, band gap, light localization, zero-refractive-index effect

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.

Key words: one-dimensional (1D) photonic crystal, finite-size effect, band gap, light localization, zero-refractive-index effect

中图分类号: (Wave propagation, transmission and absorption)

42.25.Bs

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[J]. 中国物理B, 2023, 32(5): 54201-054201.

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Size effect on light propagation modulation near band edges in one-dimensional periodic structures

Size effect on light propagation modulation near band edges in one-dimensional periodic structures

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