Transverse Anderson localization of light near Dirac points of photonic nanostructures.
We perform a comparative study of the Anderson localization of light beams in disordered layered photonic nanostructures that, in the limit of periodic layer distribution, possess either a Dirac point or a Bragg gap in the spectrum of the wavevectors. In particular, we demonstrate that the localization length of the Anderson modes increases when the width of the Bragg gap decreases, such that in the vanishingly small bandgap limit, namely when a Dirac point is formed, even extremely high levels of disorder are unable to localize the optical modes residing near the Dirac point. A comparative analysis of the key features of the propagation of Anderson modes formed in the Bragg gap or near the Dirac point is also presented. Our findings could provide valuable guidelines in assessing the influence of structural disorder on the functionality of a broad array of optical nanodevices.
Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.|Key Laboratory for Laser Plasma (Ministry of Education), IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China.
Hanying
H
Deng
Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.|Key Laboratory for Laser Plasma (Ministry of Education), IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China.
Xianfeng
X
Chen
Department of Physical Electronics, School of Electrical Engineering, Faculty of Engineering, Tel Aviv University, Tel Aviv 69978, Israel.
Boris A
BA
Malomed
Department of Electronic and Electrical Engineering, University College London, Torrington Place, London WC1E7JE, UK.
Nicolae C
NC
Panoiu
Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China.|Key Laboratory for Laser Plasma (Ministry of Education), IFSA Collaborative Innovation Center, Shanghai Jiao Tong University, Shanghai 200240, China.
Fangwei
F
Ye