“The 2023 Terahertz Science and Technology Roadmap” published in "Journal of Physics D: Applied Physics" contains two contributions from the Collaborative Research Center TRR 227 “Ultrafast spin dynamics” and the Terahertz Physics Group from the Freie Universität Berlin:

• a perspective article on "Terahertz Spintronics and Magnetism",
• and an article on "Terahertz Emission Spectroscopy and Imaging".

This open-access roadmap article is a collaborative effort of leading international experts from various countries. It is intended to provide a reference point and guide to the interested community on relevant and emerging research directions in terahertz photonics.

Building upon the success of the 2017 roadmap, this 2023 edition takes yet another timely look at newly relevant and highly active areas in terahertz photonics research. A diverse group of experts was selected for this article, representing both the breadth of new research areas and the desire to incorporate different voices and viewpoints.

This comprehensive article comprises 20 sections, with each section authored by an expert in the respective field, offering concise insights into specific subjects. On just two pages, the key aspects of each topic are briefly described, providing readers with an excellent overview and outlook on a variety of subjects in a concise format.

The "2023 Roadmap" offers guidance for the scientific and commercial application of THz (Terahertz) technologies, which play a significant role in fundamental research, as well as in applications such as medicine and telecommunications. The roadmap aims to promote research in the THz field to advance innovation and societal benefit.

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