Fang Y.-T.,Jiangsu University |
Ni Z.-Y.,Jiangsu University |
Xu Q.-S.,Jiangsu University |
Zhou J.,Ningbo University |
Wu Y.-H.,An Qing Normal University
Optics Communications | Year: 2016
The unidirectional waveguide plays a key role in optical communication system. The unidirectional waveguide modes have two forms, short wave and long wave. In order to simultaneously achieve the two kinds of unidirectional waveguide modes, we design a cross waveguide basing on the two-dimensional magneto-optical photonic crystals (2D MO PCs) and make a numerical study through the band calculations and finite element method. The horizontal unidirectional waveguide with a short wavelength is split into two vertical unidirectional waveguides with infinite wavelength. Transformation of unidirectional modes, a waveguide splitter and a zero-index waveguide are simultaneously achieved. © 2015 Elsevier B.V. All rights reserved.
Wu Y.-H.,An Qing Normal University |
Cheng F.,An Qing Normal University |
Shen Y.-C.,An Qing Normal University |
Lu G.-Q.,An Qing Normal University |
Li L.-L.,An Qing Normal University
Optik | Year: 2016
To achieve a new type of one-way transmission, we design a semi-infinite one-dimensional photonic crystal (PC) coated with a magneto-optical (MO) material film. In the surface of this structure there are merging states of MO defect state and optical Tamm state (OTS). We deduce the dispersion equation of the merging states basing on the Bloch theorem of periodic structures and transfer matrix method. There are two nonreciprocal dispersion curves of the merging states for kx and -kx, respectively. The positions of the merging states can be adjusted through changing the thickness of the MO film. With the use of the attenuated total reflection (ATR) prism coupling, we consider a one-way transmission based on a finite one-dimensional PC structure. The simulations by using a finite element method demonstrate the one-way transmission results. © 2016 Elsevier GmbH.