In the electromagnetic spectrum, the terahertz band is one of the hottest research areas. According to an American physicist organization network reported on May 2, the University of Notre Dame has experimentally proved that the use of graphene atomic layer can effectively control terahertz electromagnetic waves, and a prototype of terahertz modulator based on graphene material is produced for development. The fast, efficient and economical terahertz equipment and operating system opens up a broad arena. Related papers were recently published in the journal Nature Communication. People use electromagnetic energy every day, watching TV, listening to radio, making popcorn with microwave ovens, talking on mobile phones, taking X-rays, etc. The energy in electronic products and radio equipment is mostly transmitted in the form of electromagnetic waves. The terahertz wave is between microwave and visible light and has important applications in daily life. For example, in communication equipment, terahertz waves can carry more information than radio waves or microwaves; the potential damage caused by taking X-rays is smaller, and the medical and biological image resolution provided is higher than that of microwaves. . “The future of terahertz technology is bright, but one of the biggest bottlenecks is the lack of effective materials and equipment to manipulate these energy waves. If there is a natural two-dimensional material that can respond significantly to terahertz waves and can be adjusted, let us design High-performance terahertz equipment offers hope, and graphene is the ideal material.†Belladi Sensell-Rodriguez, a graduate student in electrical engineering at the University of Notre Dame, says graphene is a semiconductor with only one atomic thickness. Materials, with their unique electrical, mechanical and thermal properties, have potential applications in many fields, such as recently developed fast transistors, flexible transparent electronics, optical devices, and terahertz active components currently under development. The team demonstrated the first prototype they produced for conceptual demonstration. This graphene-based modulator enables in-band transitions within graphene and is the only terahertz device that can do this. Xie Huili, an associate professor in the School of Electrical Engineering, pointed out that graphene has been used as an ideal platform for new research since its discovery, but it has rarely been used in reality. Controlling terahertz waves is one of its applications. In 2006, they wanted to use two-dimensional electron gas to control terahertz waves. Last year they demonstrated the high-performance equipment based on graphene. This is the first time this experiment has been proved by experiments and will be further studied.
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