An active controllable terahertz filter with dual narrowband characteristics is proposed, which consists of two n-shaped waveguides and one vanadium dioxide defect. The simulation results show that at the resonance frequencies of 1.287 THz and 1.447 THz, the 3 dB bandwidth are 13 GHz and 3 GHz, the transmittance are 83% and 91%, and the Q value are 99.5 and 482, respectively. It has good frequency selection performance. In addition, by changing the temperature, vanadium dioxide can be converted between the metal state and the insulating state, and the two states are binary coded. At 1.287 THz and 1.447 THz, the switching function between passband and stopband can be realized. The presented filter can be used for temperature control switches in integrated photonic circuits.

提出了一种具有双窄带特性的有源可控太赫兹滤波器，它由两个n形波导和一个二氧化钒缺陷组成。仿真结果表明，在1.287 THz和1.447 THz谐振频率下，3 dB带宽分别为13 GHz和3 GHz，透射率分别为83%和91%，Q值分别为99.5和482。具有良好的选频性能。另外，通过改变温度，二氧化钒可以在金属态和绝缘态之间转换，这两种状态是二进制编码的。在1.287 THz和1.447 THz处，可以实现通带和阻带的切换功能。所提出的滤波器可用于集成光子电路中的温度控制开关。