The pseudo-diffusive phenomenon in photonic crystals with Dirac cones

Meiqing Liu; Xiaotong Guo; Yixuan Wang; Hua Gao; Haochong Huang

doi:10.1117/12.2505956

15 November 2018 The pseudo-diffusive phenomenon in photonic crystals with Dirac cones

Meiqing Liu, Xiaotong Guo, Yixuan Wang, Hua Gao, Haochong Huang

Proceedings Volume 10964, Tenth International Conference on Information Optics and Photonics; 109643L (2018) https://doi.org/10.1117/12.2505956
Event: Tenth International Conference on Information Optics and Photonics (CIOP 2018), 2018, Beijing, China

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.

Citation Download Citation

Meiqing Liu, Xiaotong Guo, Yixuan Wang, Hua Gao, and Haochong Huang "The pseudo-diffusive phenomenon in photonic crystals with Dirac cones", Proc. SPIE 10964, Tenth International Conference on Information Optics and Photonics, 109643L (15 November 2018); https://doi.org/10.1117/12.2505956

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KEYWORDS

Dispersion

Transmittance

Dielectrics

Photonic crystals

Photonics systems

Dielectric polarization

Electromagnetism

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