The propagation of light is usually interchangeable, which means that the trajectory of light traveling in one direction is the same as the trajectory of light traveling in the opposite direction. Breaking reciprocity allows light to travel in only one direction.

Particle accelerators are important tools for studying particle physics. In addition to research, accelerators are also used in many fields such as medical diagnosis, tumor analysis, and measurement of isotopes. A typical particle accelerator takes up a lot of space, the well-known particle accelerator at the European Organization for Nuclear Research (CERN) laboratory in Switzerland is 17 miles long.

According to Memes Consulting, IDTechEx, a well-known British research company, recently released this new report on optical components and display technologies, manufacturers and markets for extended reality (xR, including AR/VR/MR) applications, covering All optics and display technologies used in extended reality products.

French market research company Yole Développement announced on June 10 (European time) the 2018 MEMS (Micro-Electro-Mechanical System) global market trend and the TOP30 list of MEMS device manufacturers. According to forecasts, the total sales of MEMS companies TO P30 in 2018 increased by 5% compared with 2017 to 10.3 billion US dollars (about 70.04 billion yuan). If the global MEMS market size is regarded as 10.6 billion US dollars (about 72.08 billion yuan) 100 million yuan), the total sales of TOP30 companies account for about 90% of the total.