Floquet higher-order exceptional points and dynamics in PT-symmetric quadrimer waveguides
| Autor: | Honghua Zhong, Bo Zhu, Fuqiu Ye, Jun Jia, Haiming Deng |
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| Rok vydání: | 2020 |
| Předmět: |
Floquet theory
Physics Exceptional point 01 natural sciences Atomic and Molecular Physics and Optics 010305 fluids & plasmas law.invention Light intensity Tunneling direction Amplitude law Quantum mechanics 0103 physical sciences Gravitational singularity 010306 general physics Waveguide Merge (version control) Computer Science::Databases |
| Zdroj: | The European Physical Journal D. 74 |
| ISSN: | 1434-6079 1434-6060 |
| DOI: | 10.1140/epjd/e2020-10021-0 |
| Popis: | We investigate the effect of periodic modulation on PT-symmetry recovery, higher-order exceptional points (EPs) and dynamics for a periodically modulated PT-symmetric quadrimer waveguide system. It is analytically and numerically revealed that the periodic modulation not only can restore the broken PT symmetry, but also can manipulate the PT symmetry by tuning modulation amplitude. Furthermore, we found that multiple EPs can emerge, and as the modulation amplitude vary, these EPs can collide and merge, leading to higher-order Floquet singularities. By defining average relative light intensity distribution, we explore the dynamical characteristics nearby these EPs. It is found that we can control the light tunneling direction of optical quadrimer waveguide via periodic modulation and proper choice of gain/loss parameters. |
| Databáze: | OpenAIRE |
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