Dynamic defects in photonic Floquet topological insulators

被引：37
|
作者：
Joerg, Christina [1 ,2 ]
Letscher, Fabian [1 ,2 ,3 ]
Fleischhauer, Michael [1 ,2 ]
von Freymann, Georg [1 ,2 ,4 ]
机构：
[1] Univ Kaiserslautern, Phys Dept, D-67663 Kaiserslautern, Germany
[2] Univ Kaiserslautern, Res Ctr OPTIMAS, D-67663 Kaiserslautern, Germany
[3] Grad Sch Mat Sci Mainz, D-67663 Kaiserslautern, Germany
[4] Fraunhofer Inst Ind Math ITWM, D-67663 Kaiserslautern, Germany
来源：
NEW JOURNAL OF PHYSICS | 2017年 / 19卷
关键词：
topological insulators; waveguides; Floquet; direct laser writing; defects; REALIZATION; ABERRATION; MODES;
D O I：
10.1088/1367-2630/aa7c82
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Edge modes in topological insulators are known to be robust against defects. We investigate if this also holds true when the defect is not static, but varies in time. We study the influence of defects with time-dependent coupling on the robustness of the transport along the edge in a Floquet system of helically curved waveguides. Waveguide arrays are fabricated via direct laser writing in a negative tone photoresist. We find that single dynamic defects do not destroy the chiral edge current, even when the temporal modulation is strong. Quantitative numerical simulation of the intensity in the bulk and edge waveguides confirms our observation.
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页数：10
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