Opt Lett. 2018 Jun 1;43(11):2660-2663. doi: 10.1364/OL.43.002660.
We propose and demonstrate reduced symmetry photonic surfaces providing highly controlled Bloch wave propagation. The backward and dual directional propagations have been observed in the proposed low-symmetric periodic structures without variation in the unit-cell filling factor. Frequency-domain analyses present group indices up to negative/positive -237/+96 as strong indicators of the observed directional controlled surface waves driven by the orientation angle in the range of 20°-90°. Further verification of the index-based propagation direction has been achieved through detailed time-domain analyses and microwave experiments. Smart management of the propagation direction in low-symmetric surfaces has great potential for next-generation photonic applications.
我们提出并展示了具有高度可控布洛赫波传播的简化对称光子表面。在所提出的低对称周期结构中，在不改变单元填充因子的情况下观察到了反向和双方向传播。频域分析显示，群折射率高达负/正-237/+96，这是由 20°-90°范围内的取向角驱动的观察到的方向控制表面波的强烈指标。通过详细的时域分析和微波实验进一步验证了基于指数的传播方向。在低对称表面中对传播方向的智能管理在下一代光子应用中具有巨大的潜力。
