دورية أكاديمية
Analytical study of mode degeneracy in non-Hermitian photonic crystals with TM-like polarization
| العنوان: | Analytical study of mode degeneracy in non-Hermitian photonic crystals with TM-like polarization |
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| المؤلفون: | Yin, Xuefan, Liang, Yong, Ni, Liangfu, Wang, Zhixin, Peng, Chao, Li, Zhengbin |
| المساهمون: | Peng, C (reprint author), Peking Univ, Dept Elect, State Key Lab Adv Opt Commun Syst & Networks, Beijing 100871, Peoples R China., Peking Univ, Dept Elect, State Key Lab Adv Opt Commun Syst & Networks, Beijing 100871, Peoples R China., ETH, Inst Quantum Elect, CH-8093 Zurich, Switzerland. |
| المصدر: | SCI |
| بيانات النشر: | PHYSICAL REVIEW B |
| سنة النشر: | 2017 |
| المجموعة: | Peking University Institutional Repository (PKU IR) / 北京大学机构知识库 |
| مصطلحات موضوعية: | SURFACE-EMITTING LASERS, COUPLED-WAVE ANALYSIS, TRANSVERSE-ELECTRIC POLARIZATION, ZERO-INDEX METAMATERIALS, DIRAC CONES, TRANSMISSION, LATTICE, CHIP, NANOCAVITY, GUIDES |
| الوصف: | We present a study of the mode degeneracy in non-Hermitian photonic crystals (PC) with TM-like polarization and C-4v symmetry from the perspective of the coupled-wave theory (CWT). The CWT framework is extended to include TE-TM coupling terms which are critical for modeling the accidental triple degeneracy within non-Hermitian PC systems. We derive the analytical form of the wave function and the condition of Dirac-like-cone dispersion when radiation loss is relatively small. We find that, similar to a real Dirac cone, the Dirac-like cone in non-Hermitian PCs possesses good linearity and isotropy, even with a ring of exceptional points (EPs) inevitably existing in the vicinity of the second-order Gamma point. However, the Berry phase remains zero at the Gamma point, indicating the cone does not obey the Dirac equation and is only a Dirac-like cone. The topological modal interchange phenomenon and nonzero Berry phase of the EPs are also discussed. ; National Natural Science Foundation of China [61320106001, 61575002]; State Key Laboratory of Advanced Optical Communication Systems and Networks, China; ETH Zurich Postdoctoral Fellowship Program [FEL-27 14-2] ; SCI(E) ; ARTICLE ; 7 ; 96 |
| نوع الوثيقة: | journal/newspaper |
| اللغة: | English |
| تدمد: | 2469-9950 2469-9969 |
| العلاقة: | PHYSICAL REVIEW B.2017,96(7).; 1905655; http://hdl.handle.net/20.500.11897/471574Test; WOS:000407015600006 |
| DOI: | 10.1103/PhysRevB.96.075111 |
| الإتاحة: | https://doi.org/20.500.11897/471574Test https://doi.org/10.1103/PhysRevB.96.075111Test https://hdl.handle.net/20.500.11897/471574Test |
| رقم الانضمام: | edsbas.A80A6BAB |
| قاعدة البيانات: | BASE |
| تدمد: | 24699950 24699969 |
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| DOI: | 10.1103/PhysRevB.96.075111 |