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Smaller and stronger photonic chips achieve theoretical breakthroughs

Sunday,Mar 24,2019

 Subject to Moore's Law, the storage density and computing speed of information technology carriers are facing bottlenecks. The human eye has turned from "electricity" to faster "light", and the concept of "photonic chip" has emerged. The reporter learned from Nanjing University of Science and Technology on the 19th that the team of Professor Jiang Liyong proposed a new method to realize the surface plasmon spatial coding function, which theoretically assisted the application development of multi-functional and multi-degree-of-freedom photonic chips. Let people take a step closer to the photonic chip.

 
According to Jiang Liyong, it is the development trend of chips to load more functions through all-light control on smaller chips, with greater storage density and higher operating efficiency. But to change the photonic chip from concept to reality, there are still many theoretical and technical difficulties that need to be broken, such as semiconductor integration process compatibility and photon multi-function, multi-degree of freedom control.
 
Similar to electronic regulation, one can let light realize the storage and calculation of data by precisely regulating photon behavior. One of the current mainstream control methods is all-optical coherent regulation. Based on the theory of coherent perfect absorption, the coherent regulation is performed by “out-of-plane” symmetric incidence, but subject to the limitations inherent in this theoretical basis, the mode selectivity, spatial selectivity and integration of all-optical coherence control. The indicators are lacking.
 
Jiang Liyong's team took a different approach and based on the theory of the surface plasmon mode coherence mechanism, innovatively proposed an "in-plane" all-optical coherence control method, which broke the mechanism limitation of the "out-of-plane" all-optical coherence control method. Unique mode selectivity and spatial selectivity are more conducive to chip integration.
 
In addition, the proposed method also provides a new idea for the artificial micro-nano structure coherent spectroscopy, which can be extended to the study of spectral control of other micro-nano photonic structures such as photonic crystals. It is expected to inspire more integrated optical communication, micro-nano display and Innovative applications in areas such as sensing. Relevant research results have been published online in the international optical journal "Light: Science and Applications".

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