What are THZ waves

THz waves (terahertz waves) or known as THz rays (terahertz rays) are officially named from the mid to late 1980s, before which scientists would collectively refer to them as far-infrared rays. Terahertz waves are electromagnetic waves with a frequency in the range of 0.1 THz to 10 THz and a wavelength in the range of 0.03 to 3 mm, between microwaves and infrared. In fact, scientists have dealt with this band as early as a hundred years ago. In 1896 and 1897, Rubens and Nichols involved in this band, the infrared spectrum reaches 9um (0.009mm) and 20um (0.02mm), and then there are records of reaching 50um. In the following nearly 100 years, far infrared technology has achieved many results and has been industrialized. However, research results and data involving the terahertz band are very scarce, mainly due to the limitation of effective terahertz generating sources and sensitive detectors, so this band is also known as the THz gap. With the development of a series of new technologies and materials in the 80's, especially the development of ultrafast technology, which makes obtaining broadband stable pulsed THz sources a quasi-conventional technology, THz technology has been rapidly developed, and a wave of THz research has been set off in the practical range.