Dmitriev Victor, Martins Leno
Appl Opt. 2016 May 1;55(13):3676-80. doi: 10.1364/AO.55.003676.
We propose and investigate a new multifunctional component, consisting of a T-junction of three waveguides in 2D photonic crystal with a square lattice. One waveguide is the input port, while the other two serve as output ports. This component can fulfil three functions: First, it can switch OFF the two output ports; second, our component can be used as a 3 dB divider of the input power; and third, it can switch ON any one of the two output ports. Changing the regime is achieved by a DC magnetic field that magnetizes a cylindrical ferrite resonator placed in the T-junction. We present an analysis of the scattering matrices of the component and calculated frequency characteristics in the low terahertz region. In the frequency band of about 1 GHz with a central frequency of f=98.46 GHz, the device has the following parameters: isolation of the output ports from the input port in the first regime is better than -30 dB, division of the input signal is about (-3.8±1.0) dB in the second regime, and isolation in the regime switch ON, where any one of the two output ports is higher than -15 dB and the insertion loss is lower than -2.0 dB.
我们提出并研究了一种新型多功能组件，它由二维方形晶格光子晶体中的三条波导的T型结组成。一条波导是输入端口，另外两条作为输出端口。该组件可以实现三种功能：第一，它可以关闭两个输出端口；第二，我们的组件可以用作输入功率的3 dB分配器；第三，它可以打开两个输出端口中的任意一个。通过直流磁场改变工作状态，该磁场会使放置在T型结中的圆柱形铁氧体谐振器磁化。我们对该组件的散射矩阵进行了分析，并计算了太赫兹低频区域的频率特性。在中心频率f = 98.46 GHz的约1 GHz频带内，该器件具有以下参数：在第一种工作状态下，输出端口与输入端口的隔离度优于-30 dB；在第二种工作状态下，输入信号的分配约为(-3.8±1.0) dB；在打开任意一个输出端口的工作状态切换时，隔离度高于-15 dB，插入损耗低于-2.0 dB。
