Department of Electrical and Computer Engineering, Texas Tech University, Lubbock, Texas 79409, USA.
Opt Lett. 2013 Jul 15;38(14):2382-4. doi: 10.1364/OL.38.002382.
We report metamaterial terahertz (THz) bandpass filters with tunable dual-band selectivity. The shift in the center frequency of the device is achieved by actively modifying the effective length of the resonators. This was realized by introducing vanadium dioxide (VO2) bridges interconnecting specific regions of each resonator. Raising the temperature across the phase transition shifted the resonance frequency by ~32% due to changes in the electrical conductivity of the VO2. Measured THz transmission response of the proposed dual-band filter was in good correspondence with simulations.
我们报告了具有可调谐双频选择性的超材料太赫兹（THz）带通滤波器。通过主动改变谐振器的有效长度来实现器件中心频率的移动。这是通过在每个谐振器的特定区域引入连接的二氧化钒（VO2）桥来实现的。在相变过程中升高温度会导致 VO2 电导率的变化，从而使共振频率偏移约 32%。所提出的双频滤波器的测量太赫兹透射响应与模拟结果吻合较好。
