Spatiotemporal metasurfs are analyzed from an information standpoint, which reveals and characterizes two information transition mechanisms over group expansion and independent control of multiple harmonics.
The information transition capacity of these mechanisms is analyzed, which can be used to estimate the channel potential of the spatiotemporal metasurfs for wireless communication. The profiling presented and the results obtained will be helpful in laying the groundwork for information-based spatiotemporal metasurfs.
Spatiotemporal metasurfs, powered by ultrafast dynamic modulation, have opened up new possibilities for manipulating the harmonic modes of electromagnetic waves and generations of foreign physical phenomena, such as dispersion cancellation, Lorentzocrocity breaking, and the Doppler illusion.
In recent years, the rapid development of information technology has inspired many information processing applications for metasurfs, including performing computational imaging, wireless communication, and mathematical functions.
With increasing research on the subject of information processing with metasurfaces, a general theory is urgently needed to characterize the information processing capabilities of spatiotemporal metasurfs. In a new paper published in Light Science and Applications, Prof. Ty Jun Cui’s group at Southeast University (SEU) has reported a breakthrough on the subject.
In this work, information transition mechanisms of the spatiotemporal metasurfs are proposed and analyzed, revealing group expansion and independent control of multiple harmonics and characterizing Spatiotempora metasurfs as two major information transition mechanisms.
In particular, the group expansion mechanism can be adopted to extend the output phase states of each meta-atom by a factor of Q, where Q is a function on modulation periodicity, input phase states, and harmonic index.
Accordingly, the output spectral response states of the spatiotemporal metasurfaces are greatly enhanced, such that more precise manipulations of electromagnetic information can be obtained without increasing the complexity of the design of the metasurfs.
Additionally, researchers showed that independent control of the spectral responses of the spatiotemporal metasurface can also be realized. Independent control of multiple harmonics may open up new possibilities for metasurface-based multitasking, by which electro-magnetic information can be processed independently along frequency-gapped channels.
A proof-of-concept in the microwave regime is used to verify the mechanism of group expansion and independent control of multiple harmonics along the spatiotemporal metasurface.
By incorporating the proposed model with Shannon’s entropy theory, the authors explored the information transition potential of spatiotemporal metasurfs with respect to the above two mechanisms. The obtained results can be applied to estimate the channel capacity of the spatiotemporal metasurface, which will be helpful in guiding the analysis and design of spatiotemporal metasurfs for wireless communication.
Furthermore, they showed that the output spectral responses of the spatiotemporal metasurfaces may help to prove Fermat’s small theorem, which in turn may provide more clues for understanding the non-fading spectra responses of the Spatiotropal metasurfaces.
“The proposed theory establishes a quantitative framework for characterizing the information transition capabilities of the spatiotemporal metasurfaces, providing deep physical insights into understanding the spatiotemporal metasurfaces, and providing new approaches to facilitate analysis and design Does.
The presented framework and results obtained will, with broad-spectral applicability, be helpful for future research in the governance of information-based spatiotemporal metasurfaces, and enable new information-oriented including cognitive harmonic wavefront engineering, intelligent Would expect Computational Imaging, and 6th Generation (6G) Wireless Communications, ”concludes the scientist.