On-demand control of terahertz and infrared waves

Science Daily  July 9, 2019
According to a 2006 prediction it should be possible to use graphene in a magnetic field not only to absorb terahertz and infrared light on demand but also to control the direction of the circular polarization. An international team of researchers (Switzerland, UK) built a special experimental setup to concentrate the infrared and terahertz radiation on small samples of pure graphene in the magnetic field and the result of the experiment confirmed the theory from 2006. They found that if electrically charged carriers are introduced, either positive or negative, it is possible to choose which polarisation is absorbed, and this works both in the infrared and terahertz ranges. To observe a strong effect in the terahertz range, it is sufficient to apply magnetic fields, which could be generated by inexpensive permanent magnet. The findings could revolutionise opto-electronics, telecommunications and medical diagnostics…read more. TECHNICAL ARTICLE

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