Terahertz (THz) spectroscopy systems are widely employed to retrieve the chemical and material composition of a sample. This is single-handedly the most important driving motivation in the field and has largely contributed to shaping THz science as an independent subject. The limited availability of high-resolution imaging devices, however, still represents a major technological challenge in this promising field of research. In this theoretical work, we tackle this challenge by developing a novel nonlinear ghost imaging approach that conceptually outperforms established single-pixel imaging protocols at inaccessible wavelengths. Our methodology combines nonlinear THz generation with time-resolved field measurements, as enabled by state-of-the-art time domain spectroscopy techniques. As an ideal application target, we consider hyperspectral THz imaging of semitransparent samples with nonnegligible delay contribution, and we demonstrate how time-resolved, full-wave acquisition enables accurate spatiotemporal reconstruction of complex inhomogeneous samples.

中文翻译：

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时间分辨非线性鬼影成像

太赫兹（THz）光谱系统广泛用于检索样品的化学和材料成分。单凭这是该领域最重要的驱动动力，并且在很大程度上将太赫兹科学塑造成一门独立的学科。然而，高分辨率成像设备的有限可用性仍然代表着这一有前途的研究领域中的主要技术挑战。在这项理论工作中，我们通过开发一种新颖的非线性重影成像方法来应对这一挑战，该方法在概念上优于无法访问的波长下已建立的单像素成像协议。我们的方法将非线性THz生成与时间分辨的现场测量相结合，这是由最新的时域光谱技术实现的。作为理想的应用目标，