Zhi Li

Airy beams exhibit enormous application potential in the field of optics and microwave owing to their unique self-bending, self-accelerating, and non-diffracting characteristics. In this paper, the Airy beams are dynamically generated and manipulated in both reflection and transmission spaces utilizing a full space programmable metasurface, which can achieve an approximately 360° phase coverage in the reflection space and a nearly 180° phase coverage in the transmission space in the operating frequency band from 6 GHz to 7 GHz. The direct current (DC) bias voltage is applied to the varactor diodes integrated on the metasurface by precise control of the external feeding system, allowing dynamic generation and regulation of Airy beams. Numerical simulations and experimental measurements are performed at 6.5 GHz. The Airy beams with parameters a = 56 and 61 are generated in the transmission space, while the Airy beams with parameters a = 71 and 81 are achieved in the reflection space. The parabolic propagation trajectory of the main beams and acceleration in the transverse planes can be observed. The good agreement between the simulated and measured results demonstrates that the metasurface can dynamically generate and manipulate the Airy beams in full space. The suggested Airy beam manipulation system has a wide range of applications, including optical particle manipulation, imaging, and difficult terrain exploration.

高阶厄米高斯（HG）模压缩态光场作为一种量子光源，在量子精密测量，量子成像等领域有重要的应用价值。HG模式量子态增强空间测量精度很大程度上取决于其压缩度。然而，利用光学参量振荡器产生高阶HG模压缩光的压缩度主要受泵浦功率限制。本文理论分析并实验验证利用楔角非线性晶体构成的双共振光学参量振荡器，在低泵浦功率条件下实现HG₁₀模压缩态光场的实验制备。这里,通过调节光场经历楔角非线性晶体的长度和工作温度,从而补偿HG₂₀与HG₁₀模式在腔内的Gouy相位差和非线性晶体中不同频率光场引起的像散，同时实现双共振条件和相位匹配要求。实验结果表明仅需51mW的HG₂₀模式泵浦光操控光学参量振荡器产生9.1 dB的HG₁₀模压缩态光场。该量子技术解决了光学参量振荡器产生高阶横模量子态受泵浦功率限制的问题，可用于制备高压缩度的高阶HG模压缩态光场，为提高空间测量精度提供有效手段。