Abstract
As 5 G ever becomes a part of everyday life and 6 G is also on the agenda, terahertz technology has gradually become known by the public, and is referred to as the "third eye" for human beings to understand the world.Terahertz is considered one of the top ten technologies that will change the world due to its unique properties. In 2019, astronomers were able to observe a black hole for the first time, using a terahertz astronomical telescope. Terahertz is no longer far away from our lives, whether it is information, medicine, or food safety and other fields. It is everywhere, triggering major changes in people's work and lifestyle.Today's guest of Light People is an internationally renowned scholar who has been engaged in terahertz research for many years, Professor Xi-Cheng Zhang works at the University of Rochester, one of the three major optics educational centers in the United States. As a pioneer in the field of terahertz technology, after years of practice, he has successfully generated terahertz waves using water, changing how we see water with THz wave forever.Next, please follow the Light Science Editor into the terahertz world to learn about the latest and most cutting-edge science and technology and the "story" behind it.