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Prof. Jiang’s new finding for integrated photonic chip design

IMAGE: Schematic diagram of the idea of In-Plane Coherent Control of Plasmon Resonances for Plasmonic Switching and Encoding

Due to the uncertainty principle, the electron motion will be out of control in a scale of several atoms. This basic principle determines a limitation of running speed for semiconductor transistors, as predicted by the well-known Moore‘s Law. A promising method to break such barrier is using photon to replace electron for information operation and storage. Over the past decade, the photonic chip has become a fast developing technique but it still face some critical problems, such as integrated light source, compatibility, and logic unit design. All-optical coherent control is one of the most promising way for logic unit design. Current coherent control is based on the coherent perfect absorption effect and operated in the out-of-plane manner, which has shown obvious shortcoming for integrated photonic chip application.

Recently, Professor Liyong Jiang from Nanjing University of Science & Technology and cooperators from China and Singapore proposed a new in-plane coherent control method and verified its application in all-optical switching and encoding design. This new method shows a different working principle based on the constructive/destructive interference of plasmonic modes. It also has particular mode-selection and spatial-selection advantages which are particular suitable for integrated logic unit design and can active all-optical coherent control with multiple degrees. This work was recently on-line published in Light: Science & Applications, entitled with “In-plane coherent control of plasmon resonances for plasmonic switching and encoding”. Light: Science & Applications was ranked second among all international scientific journals of optics in 2018.

Prof. Jiang says: “Although we still have a long way to reach the final dream of photonic chip, our work represents an important step towards the logic unit design by all-optical coherent control. Besides the photonic chip, our method is also quite useful for other photonic applications, such as surface-enhanced spectra, imaging, lasing, and sensing”.

The work is supported by the National Natural Science Foundation of China, the Natural Science Foundation of Jiangsu Province, the Six Talent Peaks Project in Jiangsu Province, and the Youth Talent Program in NUST.

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