论文标题
在空间上塑造海浪，以渗透到禁止缝隙内部的深处
Spatially shaping waves to penetrate deep inside a forbidden gap
论文作者
论文摘要
众所周知，入射在晶体上的波仅在有限的距离内（布拉格长度）运输，然后再被布拉格干扰反射。在这里，我们通过研究示例性二维硅光子晶体中的光，演示了如何将波更深地发送到晶体中。通过空间塑造光波前，我们观察到探测内部能量密度的侧面散射光的强度在远离前表面的可调距离处增强。与随机波前相比，强度高达$ 100 \ times $增强，并延长了$ 8 \ times $ bragg的长度。我们在禁忌间隙内的波浪转向，利用了与完美周期性不可避免的偏差引起的传输通道，这里是不可避免的制造偏差。
It is well known that waves incident upon a crystal are transported only over a limited distance - the Bragg length - before being reflected by Bragg interference. Here, we demonstrate how to send waves much deeper into crystals, by studying light in exemplary two-dimensional silicon photonic crystals. By spatially shaping the optical wavefronts, we observe that the intensity of laterally scattered light, that probes the internal energy density, is enhanced at a tunable distance away from the front surface. The intensity is up to $100 \times$ enhanced compared to random wavefronts and extends as far as $8 \times$ the Bragg length. Our novel steering of waves inside a forbidden gap exploits the transport channels induced by unavoidable deviations from perfect periodicity, here unavoidable fabrication deviations.
