Recently, Professor Zhou Ji from School of Materials Science and Technology of Tsinghua University published a research report entitled "Artificial Nonlinearity Generated from Electromagnetic Coupling Meta-molecule" in "Physical Review Letters". Based on the classical electromagnetism theory, the achievement is based on the idea of ​​superconducting materials, and a new kind of artificial optical nonlinear material is proposed.

(A) Schematic diagram of nonlinear supramolecular array structure, (b) Schematic diagram of a single nonlinear supramolecular structure

Optical nonlinearity is a universal physical effect caused by the interaction of glare and matter and has played a crucial role in such disruptive technologies as laser technology, optical communication and optical information technology. However, due to the lack of clear physical images that describe natural nonlinear processes, the search for nonlinear optical materials has long been at a qualitative or semi-quantitative stage. Achieving an artificial optical nonlinear material that can be accurately predicted and precisely designed becomes a challenging and promising subject.

The picture shows the magnetic field distribution of nonlinear supramolecules in the resonant state

The artificial material proposed in this study is based on the coupling of the electric field and the magnetic field inside a meticulously designed metamolecule to break the spatial symmetry of the material's physical environment and thus achieve the optical nonlinearity of the artificial design. The non-linearity is completely derived from artificial superconducting molecules without the participation of natural optical nonlinear materials, so the optical nonlinearity generated can be precisely designed and controlled by changing the artificial structure. At the same time, the physical process of the artificial nonlinear theory is clear and clear and can be applied to a very wide electromagnetic spectrum. Relevant research results show that by appropriate scaling of the molecular structure of the super-structure, it can produce significant optical nonlinearity in the microwave to infrared band. This completely new artificial theory enables optical nonlinearity with unprecedented design freedom and will promote the rapid development of a new generation of light sources and optical information technologies as well as new technologies such as nonlinear optical lenses and nonlinear holograms And development.

(A) Time-domain transmission spectra of nonlinear supramolecules; (b) Frequency-domain spectra of transmitted electric fields. Embedded image: two uncoupled hypersatoms simulation of the frequency domain transmission spectrum.

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