近日，南京大学陆延青团队研究了具有光模式铁电向列的可重构非线性Pancharatnam-Berry衍射光学。2025年9月10日，《光：科学与应用》杂志发表了这篇论文。

平面光学元件结合空间变化的Pancharatnam-Berry相位，通过实现对振幅、相位和偏振的连续控制，彻底改变了光场的操纵。虽然以往的研究以线性泛函为主题的极性液晶（LC）引起了广泛的关注，但将这一概念扩展到非线性领域为先进的光学处理提供了前所未有的机会。

研究组展示了可重构非线性Pancharatnam-Berry LC衍射光学在光模式离子掺杂铁电向列中的应用。通过定制高效二次谐波激发的空间相位分布，他们实现了各种光学状态朝向预定义衍射方向的可编程光束控制。实验结果揭示了在电变化张开条件下衍射级、强度分布和偏振态的连续演化，与研究组的理论预测一致。这项工作为设计可重构的非线性光束整形和转向装置开辟了新的途径，这些装置在先进的光学和量子信息处理中具有潜在的应用。

附：英文原文

Title: Reconfigurable nonlinear Pancharatnam-Berry diffractive optics with photopatterned ferroelectric nematics

Author: Chen, Hui-Feng, Tao, Xin-Yu, Zhu, Bo-Han, Pan, Jin-Tao, Ma, Ling-Ling, Chen, Chao, Zhu, Wen-Guo, Chen, Wei, Lu, Yan-Qing

Issue&Volume: 2025-09-10

Abstract: Planar optical elements incorporating space-varying Pancharatnam-Berry phase have revolutionized the manipulation of light fields by enabling continuous control over amplitude, phase, and polarization. While previous research focusing on linear functionalities using apolar liquid crystals (LCs) has attracted much attention, extending this concept to the nonlinear regime offers unprecedented opportunities for advanced optical processing. Here, we demonstrate the reconfigurable nonlinear Pancharatnam-Berry LC diffractive optics in photopatterned ion-doped ferroelectric nematics. By customizing the spatial phase distribution of efficient second-harmonic excitation, we accomplish programmable beam steering of various optical states towards predefined diffraction directions. Experimental results reveal continuous evolution of diffraction orders, intensity distributions, and polarization states under electrically varying splay conditions, consistent with our theoretical predictions. This work opens new avenues for designing reconfigurable nonlinear beam shaping and steering devices with potential applications in advanced optical and quantum information processing.

DOI: 10.1038/s41377-025-01981-0

Source: https://www.nature.com/articles/s41377-025-01981-0