Interdigitated photoconductive antenna-based two-color femtosecond laser filamentation THz time-domain spectral detection

Two-color femtosecond (fs) laser filamentation in the gas medium is an effective way to generate broadband and high intensity terahertz (THz) pulse. The interdigitated photoconductive antenna (iPCA) has the advantages of both broadband detection and high signal-to-noise ratio (SNR), which is a very effective way to detect the THz pulse produced by two-color fs laser filamentation. The THz signal from two-color fs laser filamentation is comprehensively characterized by the iPCA, which achieves high SNR, high sensitivity, and polarization detection. This work provides a new idea for high power broadband THz coherent detection. (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Automated summary

This study demonstrates the effective generation and detection of broadband and high-intensity terahertz pulses using two-color femtosecond laser filamentation and an interdigitated photoconductive antenna (iPCA). The iPCA enables comprehensive characterization of the terahertz signal with high signal-to-noise ratio, sensitivity, and polarization detection. This work provides new insights into high-power broadband terahertz coherent detection.