High-Resolution Terahertz Hyperspectral Imaging With Swept-Frequency Dual-Comb

Dual-comb based hyperspectral imaging (DCHI) offers outstanding advantages for ultra- precise spectral analysis. In this work, we present and demonstrate terahertz (THz) hyperspectral imaging using a photonic swept-frequency dual-comb THz source, which combines frequency-modulated continuous waves (FMCW) with dual electro-optic combs. The proposed innovative approach can overcome the typical trade-off between spectral bandwidth and frequency resolution in traditional dual-comb imaging systems, impressively achieving a frequency resolution of 50 MHz within a flexible spectral bandwidth of 220-320 GHz for non-destructive imaging diagnostics.