The emerging application of sub-THz and THz technology for 6G communications (including future 6G Wi-Fi) has focused attention on the THz sensing and detection technology.  This tutorial will cover

• THz detection for 6G communications (in sub- THz and THz atmospheric windows)
• THz sensing of biological and chemical hazardous agents
• THz cancer detection and other medical applications
• THz homeland security applications
• THz sensing in radioastronomy and space research
• THz sensing for industrial control
• THz scanning detection for VLSI yield and reliability control
• THz scanning for hardware cyber security.

The  overview of the THz sensing technology will include the state-of-the-art THz sources. These sources range from traditional pulsed THz sources and frequency multipliers using IMPATT and Gunn diodes to Quantum Cascade lasers and THz plasmonic arrays. I will then discuss the THz detectors including emerging Si, III-V, III-N, and graphene plasmonic TeraFETs and spectroscopic and line-of-sight vector THz detection.  The THz detection for 6G communications in the 300 GHz range could be implemented using  Si CMOS with the 20 nm SOI technology node being a prime candidate for this application.