| Autor: |
Kaiwen Ji, Zhenjuan Liu, Yanan Dai, Yuanmei Gao, YiShan Wang, Jintao Bai, Guoquan Zhang, Xinyuan Qi |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
New Journal of Physics, Vol 21, Iss 10, p 103053 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
1367-2630 |
| DOI: |
10.1088/1367-2630/ab4d09 |
| Popis: |
We propose a novel method to reshape the light beam in a Hermiticity-tunable photonic lattice with PT symmetric perturbations. By adjusting the PT perturbations, the Hermiticity of the system varies alternatively, further resulting in the periodic oscillations of the group velocity ( v _g ) as well as the group velocity dispersion (GVD). Once the values of v _g and its corresponding GVD recover and the averaged group velocity ( ${\bar{v}}_{{\rm{g}}}$ ) is zero, the light beam will be localized and recur at these Hermitian points. Further study indicates that GVD plays a key role in the evolution of the light beam, larger positive dispersion [Re(GVD)] and lower magnitude of Im(GVD) lead to higher peak energy of the light field. Our work provides a non-resonant way to control the light propagation and to reshape the group velocity distribution, which may have promising applications in all-optical circuit, optical sensor and optical communications. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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