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New Artificial Electromagnetic Material R&D Process and Prediction Application Field

A new type of artificial electromagnetic material (metamaterial) is an artificial material composed of periodically or non-periodically arranging sub-wavelength macroscopic basic units having a specific geometry. It differs from traditional materials in that it replaces the original microscopic size of atoms or molecules with macro-sized units. Therefore, the characteristics of the new artificial electromagnetic material depend on its basic unit structure. People can control the material properties by artificially designing the unit structure to form special structural materials that do not exist in the natural world and control the propagation of electromagnetic waves.
In early 2009, Professor Cui Tiejun’s research team at Southeast University cooperated with Professor Dmitry Smith's research team to take a new step in the study of “stealth coats” and developed stealth clothing with a microwave bandwidth of ground targets with a low bandwidth and low loss. The research results were published in the "Science" magazine on January 15, 2009. Cui Tiejun and Smith are co-communication authors of this paper. The newly developed stealth coat is actually more like a "stealth carpet". By covering it with a target, it can achieve broadband stealth for this goal. After the above papers were published, they attracted the attention of internationally important science and technology media. "Nature," "The Physical World," "Discovery," "Scientific American," and "CBC News" have reported on this achievement at the earliest opportunity.
Following the "stealth rug," Professor Cui Tiejun's research team has made important progress in the study of "electromagnetic black holes." A black hole is generally considered to be a region where the gravitational field of a magnetic material reaches a critical state and can absorb all objects that touch it. This gravitational field-based black hole is difficult to simulate and verify experimentally in the laboratory, but one can study some of its properties by analogy. In October 2009, Professor Cui Tiejun’s team used the experimental device to simulate the “electromagnetic black hole” in the microwave frequency range for the first time, and experimentally validated the “optical black hole” theory proposed by scientists at Purdue University in the microwave band. This artificial electromagnetic black hole is composed of a new type of artificial electromagnetic material, resonant and non-resonant. The trajectory of an electromagnetic wave in an inhomogeneous medium is used to simulate the motion of a substance in a curved space under a gravitational field to simulate some properties of a black hole. The experimental results show that the electromagnetic black hole can capture electromagnetic waves omnidirectionally and guide the electromagnetic waves to travel spirally until they are absorbed by the black holes. In the microwave frequency range, black holes can absorb more than 99% of electromagnetic waves. The above research results were immediately announced on the physics online preprinting website arXiv.org, which immediately attracted great attention from the international mainstream technology media. Britain’s “Nature,” “New Scientist,” American “Discovery,” “Scientific American,” “MIT Technical Review,” and “Physical Science,” all made detailed reports on this work and invited experts to comment. Dr. Pendry, one of the founders of the new artificial electromagnetic material discipline at the Imperial College in London, commented in a commentary on Scientific American that "This new study has created a completely new way of absorbing electromagnetic waves while controlling the absorption of electromagnetic waves. ". Due to the efficient absorption of electromagnetic waves, electromagnetic black holes are expected to gain important applications in electromagnetic stealth.

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