在空间上塑造波，使其深入禁隙
Spatially shaping waves to penetrate deep inside a forbidden gap
摘要：
众所周知，入射到晶体上的波在被布拉格干涉反射之前仅在有限的距离（布拉格长度）上传输。在这里，我们演示了如何发送波更深的晶体，通过研究光在典型的二维硅光子晶体。通过对光学波前进行空间成形，我们观察到探测内能密度的横向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，并且延伸到布拉格长度的$8 \times$。我们的新的禁隙内的波转向利用不可避免的偏离完美的周期性，这里不可避免的制造偏差引起的传输通道。
英文摘要：
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.
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