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Proceedings Paper

The pseudo-diffusive phenomenon in photonic crystals with Dirac cones
Author(s): Meiqing Liu; Xiaotong Guo; Yixuan Wang; Hua Gao; Haochong Huang
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Paper Abstract

Pseudo-diffusive phenomenon is an abnormal transmission phenomenon both in electric system and photonic system which hold conical dispersion relations in their band structures. The phenomenon is: near a Dirac point, the transmittance of the system is inversely proportional to the sample’s thickness as if the material was a disordered medium. It is known that in photonic system, Dirac cones can be classified into three different types, which are standard single Dirac cone, double Dirac cones and Dirac-like cone. Some of them can be found either at the center and the corners of the first Brillouin zone. So it raises the questions that: Do the types of the Dirac cones affect the pseudo-diffusive phenomenon? And further, is there any connection between the pseudo-diffusive phenomenon and the locations of the Dirac cones? Through theoretical investigation, we found that the locations of the Dirac cones play a critical role on the pseudo-diffusive phenomenon. If the Dirac cone is located in the center of the Brillouin zone, the pseudo-diffusive phenomenon doesn't exist at the Dirac frequency. Besides, the shapes of the Dirac cones also affect the pseudo-diffusive phenomenon. The non-conical dispersion band of the Dirac-like cone makes the transmission quite different from linear decrease with the increase of the thickness.

Paper Details

Date Published: 15 November 2018
PDF: 7 pages
Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 109643L (15 November 2018); doi: 10.1117/12.2505956
Show Author Affiliations
Meiqing Liu, China Univ. of Geosciences (China)
Xiaotong Guo, China Univ. of Geosciences (China)
Yixuan Wang, China Univ. of Geosciences (China)
Hua Gao, China Univ. of Geosciences (China)
Capital Normal Univ. (China)
Haochong Huang, China Univ. of Geosciences (China)

Published in SPIE Proceedings Vol. 10964:
Tenth International Conference on Information Optics and Photonics
Yidong Huang, Editor(s)

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