This paper demonstrates a novel Time-Resolved Nonlinear Ghost Imaging technique for hyperspectral THz microscopy. By combining nonlinear wavelength conversion, time-resolved detection, and computational imaging, the technique overcomes limitations of traditional methods in near-field imaging due to space-time coupling, enabling high-fidelity image and spectral reconstruction of samples like metallic structures and a leaf.

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This paper presents a novel approach to hyperspectral THz microscopy using nonlinear ghost imaging. The combination of nonlinear wavelength conversion, time-resolved detection, and computational imaging demonstrates promising results for near-field imaging where traditional methods are limited by space-time coupling. The technique's ability to overcome this limitation and provide high-fidelity image reconstruction is a significant advancement. However, the limited experimental validation and idealized assumptions warrant a rating of 4 rather than 5.