液晶材料光子晶体由于具有可调谐性而得到了广泛的研究，但目前的研究主要集中在可调的光子带隙特性上。详细研究了液晶光子晶体的可调自准直特性。使用平面波展开法分析了液晶旋转角对光子晶体自准直频率的影响，并使用时域有限差分法对光在液晶光子晶体中的传输进行了仿真。结果表明，通过控制液晶旋转角，可以对光子晶体自准直频率进行调节，从而满足不同频率自准直的需要。

Photonic crystals with liquid-crystal materials are extensively studied for their tunability. However, until now the studies mainly focus on the tunable photonic band gap properties. In this article, the tunable self-collimation in liquid-crystal-filled photonic crystals is discussed in detail. The impact of the twist angle of liquid crystals on the self-collimating frequencies is presented by using the plane wave expansion method. Moreover, the light propagation in the photonic crystal is simulated with the finite-difference time-domain method. The simulations show that the self-collimating frequencies are tunable by changing the liquid-crystal twist angle so that the self-collimating photonic crystals can be applied in different frequency bands.