AI 中文总结
本研究建立统一框架，通过半导体中超快光电流相干控制实现矢量太赫兹光束的生成与合成，提出逆向设计方法，为制备可控的可重构太赫兹源提供新途径。
AI 中文摘要
太赫兹（THz）辐射为超快光谱学、成像和通信提供了强大平台，但对其空间和偏振结构的确定性控制仍具挑战性。本研究建立了一套统一框架，通过半导体中超快光电流的相干控制来产生和合成矢量太赫兹光束。利用飞秒矢量光束驱动的单光子与双光子激发路径之间的量子干涉，研究人员证明了光场的空间相位和偏振结构可直接映射到注入电流的幅值和方向。这种结构化电荷运动相当于可编程太赫兹天线，可实现定制化远场发射。除了对柱矢量光束和全庞加莱光束产生太赫兹的正向建模外，本研究还引入了逆向设计方法，可从所需的太赫兹场图案中重构出所需的电流分布及对应的激发光束轮廓。这种可逆映射将相干光电流控制转化为太赫兹光束整形的系统设计策略。研究结果连接了结构光与太赫兹光子学，为制备具备可控振幅、相位和偏振轮廓的紧凑型、全光学、可重构太赫兹源提供了途径。
英文摘要
Terahertz (THz) radiation provides a powerful platform for ultrafast spectroscopy, imaging, and communication, yet deterministic control over its spatial and polarization structure remains challenging. Here we establish a unified framework for generating and synthesizing vectorial THz beams through coherent control of ultrafast photocurrents in semiconductors. By exploiting quantum interference between one- and two-photon excitation pathways driven by femtosecond vector beams, we demonstrate that the spatial phase and polarization structure of the optical fields can be directly mapped onto the magnitude and orientation of injected currents. This structured charge motion acts as a programmable THz antenna, enabling tailored far-field emission. Beyond forward modeling of THz generation from cylindrical vector beams and full Poincaré beams, we introduce an inverse-design methodology that reconstructs the required current distribution--and corresponding excitation beam profiles--from a desired THz field pattern. This invertible mapping transforms coherent photocurrent control into a systematic design strategy for THz beam shaping. Our results bridge structured light and THz photonics, providing a route toward compact, all-optical, and reconfigurable THz sources with engineered amplitude, phase, and polarization profiles.
Comments17 pages, 5 figures, 1 supplementary file
