scholarly journals A band engineering method to create Dirac cones of accidental degeneracy in general photonic crystals without symmetry

2021 ◽  
Author(s):  
Lai Yun ◽  
Hongchen Chu ◽  
Yang Zhang ◽  
jie luo ◽  
Changqing Xu ◽  
...  
Keyword(s):  
Photonic Crystals ◽  
Engineering Method ◽  
Band Engineering ◽  
Accidental Degeneracy

scholarly journals Pseudospin-1 Physics of Photonic Crystals

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
A. Fang ◽  
Z. Q. Zhang ◽  
Steven G. Louie ◽  
C. T. Chan
Keyword(s):  
Photonic Crystals ◽  
Recent Progress ◽  
Berry Phase ◽  
Nodal Point ◽  
Band Shift ◽  
Effective Spin ◽  
Klein Tunneling ◽  
Accidental Degeneracy ◽  
Photonic States ◽  
Zero Index

We review some recent progress in the exploration of pseudospin-1 physics using dielectric photonic crystals (PCs). We show some physical implications of the PCs exhibiting an accidental degeneracy induced conical dispersion at the Γ point, such as the realization of zero refractive index medium and the zero Berry phase of a loop around the nodal point. The photonic states of such PCs near the Dirac-like point can be described by an effective spin-orbit Hamiltonian of pseudospin-1. The wave propagation in the positive, negative, and zero index media can be unified within a framework of pseudospin-1 description. A scale change in PCs results in a rigid band shift of the Dirac-like cone, allowing for the manipulation of waves in pseudospin-1 systems in much the same way as applying a gate voltage in pseudospin-1/2 graphene. The transport of waves in pseudospin-1 systems exhibits many interesting phenomena, including super Klein tunneling, robust supercollimation, and unconventional Anderson localization. The transport properties of pseudospin-1 systems are distinct from their counterparts in pseudospin-1/2 systems, which will also be presented for comparison.

Dirac cones induced by accidental degeneracy in photonic crystals and zero-refractive-index materials

2011 ◽  
Vol 10 (8) ◽  
pp. 582-586 ◽  
Author(s):  
Xueqin Huang ◽  
Yun Lai ◽  
Zhi Hong Hang ◽  
Huihuo Zheng ◽  
C. T. Chan
Keyword(s):  
Refractive Index ◽  
Photonic Crystals ◽  
Accidental Degeneracy

scholarly journals Pseudospin-1 Physics of Photonic Crystals

Research ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-15 ◽  
Author(s):  
A. Fang ◽  
Z. Q. Zhang ◽  
Steven G. Louie ◽  
C. T. Chan
Keyword(s):  
Photonic Crystals ◽  
Recent Progress ◽  
Berry Phase ◽  
Nodal Point ◽  
Band Shift ◽  
Effective Spin ◽  
Klein Tunneling ◽  
Accidental Degeneracy ◽  
Photonic States ◽  
Zero Index

We review some recent progress in the exploration of pseudospin-1 physics using dielectric photonic crystals (PCs). We show some physical implications of the PCs exhibiting an accidental degeneracy induced conical dispersion at the Γ point, such as the realization of zero refractive index medium and the zero Berry phase of a loop around the nodal point. The photonic states of such PCs near the Dirac-like point can be described by an effective spin-orbit Hamiltonian of pseudospin-1. The wave propagation in the positive, negative, and zero index media can be unified within a framework of pseudospin-1 description. A scale change in PCs results in a rigid band shift of the Dirac-like cone, allowing for the manipulation of waves in pseudospin-1 systems in much the same way as applying a gate voltage in pseudospin-1/2 graphene. The transport of waves in pseudospin-1 systems exhibits many interesting phenomena, including super Klein tunneling, robust supercollimation, and unconventional Anderson localization. The transport properties of pseudospin-1 systems are distinct from their counterparts in pseudospin-1/2 systems, which will also be presented for comparison.

Elusive photonic crystals come a step closer

Nature ◽  
2020 ◽  
Vol 585 (7826) ◽  
pp. 506-507
Author(s):  
John C. Crocker
Keyword(s):  
Photonic Crystals

SPECTRAL THEORY OF 2-D PHOTONIC CRYSTALS: ANALYTICAL GROUNDS

2016 ◽  
Vol 75 (16) ◽  
pp. 1417-1433 ◽  
Author(s):  
Yurii Konstantinovich Sirenko ◽  
K. Yu. Sirenko ◽  
H. O. Sliusarenko ◽  
N. P. Yashina
Keyword(s):  
Photonic Crystals ◽  
Spectral Theory
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