Optical generation of strong-field terahertz radiation and its application in nonlinear terahertz metasurfaces

Extremely nonlinear terahertz (THz)-matter interactions and applications have positioned themselves as the next frontier in quantum information, nonlinear optics, and particle acceleration. However, the absence of free-space highly intense THz sources and the diffraction limit, which prevents THz waves from being concentrated to the nanoscale scale, are inhibiting the growth of extreme THz. To address this difficulty, suitably extremely concentrated THz sources are being produced, while (non-)resonant artificial metastructures are being widely used to enhance local fields, resulting in deep-subwavelength (

Automated summary

Extremely nonlinear terahertz (THz)-matter interactions and applications have become the next frontier in quantum information, nonlinear optics, and particle acceleration. However, the lack of highly intense THz sources and the diffraction limit hinder the growth of extreme THz. To address this issue, researchers are developing highly concentrated THz sources and utilizing resonant artificial structures to enhance local fields.