Fragile topology based helical edge states in two-dimensional moon-shaped photonic crystals

2020 ◽  
Vol 102 (24) ◽  
Author(s):  
Zhongfu Li ◽  
Hsun-Chi Chan ◽  
Yuanjiang Xiang
Keyword(s):  
Photonic Crystals ◽  
Two Dimensional ◽  
Edge States

Two-dimensional Topological Photonic Crystals with Helical Edge States below the Light Line

2021 ◽  
Author(s):  
Chengkun Zhang ◽  
Hironobu Yoshimi ◽  
Yasutomo Ota ◽  
Satoshi Iwamoto
Keyword(s):  
Photonic Crystals ◽  
Two Dimensional ◽  
Edge States ◽  
Light Line

Dual modulation of topological edge states from two-dimensional photonic crystals with lattice shrink

2021 ◽  
pp. 2150236
Author(s):  
Xiao-Xue Li ◽  
Yun-Tuan Fang ◽  
Li-Xia Yang
Keyword(s):  
Photonic Crystals ◽  
Edge State ◽  
Wide Bandgap ◽  
Two Dimensional ◽  
Edge States ◽  
Source Position ◽  
State Structure ◽  
Intense Field ◽  
Flat Edge ◽  
Field Localization

The current topological edge states lack dynamical modulation and the intense field localization effect. To solve these problems, we construct a topological edge state structure based on two-dimensional photonic crystals with lattice shrink. Through the optimization of structure parameters, a nearly flat edge state dispersion curve occurs in a wide bandgap. The topological edge states with intense field localization take on some unique properties such that the transport directions can be controlled by both the source spin and the source position. The transport modes can be dynamically switched between the two opposite unidirectional channels just through moving the source position.

scholarly journals Symmetrical and anti-symmetrical topological edge states based on two-dimensional magneto-optical photonic crystals

AIP Advances ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 065029
Author(s):  
Hua-Shan Lai ◽  
Hao Chen ◽  
Bo He ◽  
Cheng He ◽  
Yan-Feng Chen
Keyword(s):  
Photonic Crystals ◽  
Two Dimensional ◽  
Edge States

scholarly journals Reconfigurable Topological Phases in Two-Dimensional Dielectric Photonic Crystals

Crystals ◽  
2019 ◽  
Vol 9 (4) ◽  
pp. 221 ◽  
Author(s):  
Hongbo Huang ◽  
Shaoyong Huo ◽  
Jiujiu Chen
Keyword(s):  
Photonic Crystals ◽  
Lattice Structure ◽  
Topological Defects ◽  
Topological Phases ◽  
Two Dimensional ◽  
Edge States ◽  
Microwave Frequencies ◽  
Potential Applications ◽  
Microwave Photon ◽  
Elliptical Cylinders

The extensive research on photonic topological insulators has opened up an intriguing way to control electromagnetic (EM) waves. In this work, we numerically demonstrate reconfigurable microwave photon analogues of topological insulator (TIs) in a triangular lattice of elliptical cylinders, according to the theory of topological defects. Multiple topological transitions between the trivial and nontrivial photonic phases can be realized by inhomogeneously changing the ellipse orientation, without altering the lattice structure. Topological protection of the edge states and reconfigurable topological one-way propagation at microwave frequencies, are further verified. Our approach provides a new route towards freely steering light propagations in dielectric photonic crystals (PCs), which has potential applications in the areas of topological signal processing and sensing.

Sign in / Sign up

Export Citation Format

Share Document