A joint research group from Harvard University in the United States and Leeds University in the United Kingdom recently demonstrated a new type of terahertz semiconductor laser, which emits terahertz light wave collimating performance significantly improved compared to traditional terahertz light sources. The successful development of this laser has opened up a wider field for the application of terahertz technology. Harvard has filed a series of patent applications for this. This progress was published in the August 8 issue of Nature Materials. The new terahertz laser breaks through the limitations of traditional materials. The researchers carved a set of sub-wavelength gratings, which directly doubled the light flux of the metamaterial crystal plane. Micron, which belongs to far infrared in the visible spectrum), greatly reducing the scattering angle of these semiconductor lasers, while maintaining a high output power of light energy. This metamaterial is directly embedded in the high-absorption gallium arsenide crystal surface of the optical device. In the demonstration, it can be seen that artificial light shows micrometer gratings with different depths, each with different functions. The light blue slit can double the output laser power, and guide it to the crystal surface. Terahertz (T-rays) can penetrate paper, clothing, plastics and other materials. It is ideal for detecting hidden weapons and biological agents. It has no harm and side effects on humans when doing tumor imaging detection, and can detect the inside of the material. Defects such as fractures can also be used for highly sensitive detection of interstellar thin chemicals. Researcher Capasso said that the new artificial optical device, the laser emitted from the crystal plane is very compact, the aiming degree is very high, and the high degree of condensation allows the light to be effectively concentrated, which is difficult to achieve with expensive and bulky traditional lenses. Another researcher, Linfield, said that the new THz laser can also be used by customs to detect illegal drugs and can check whether the manufactured and stored drugs are qualified. This metamaterial can also be used as a demonstration tool, and also has some magical potential features, such as the development of stealth cloaks, negative refraction, and high-resolution images. Another important significance of the research is the photoconductivity of this metamaterial. The extremely strong terahertz light generated by the device is directed to the laser crystal plane with a straight beam. This super-strong limited guiding effect can also be applied to sensors and terahertz optical paths. Hedge Cutter,Double Blade Hedge Trimmer,Battery Hedge Trimmer,Telescopic Hedge Trimmer Shaoxing Haotuo Machinery CO., LTD. , https://www.haotuochinatools.com