Shulou(Shulou.com)11/24 Report--

Thanks to the CTOnews.com netizen Mr. Air, the spirit boy, the monk for the clue delivery! CTOnews.com, February 12, compared with electrons, photons have many advantages, such as high speed, low energy consumption, high capacity and so on. Optoelectronic fusion system is considered to be an important direction to build the next generation of high efficiency, high integration, low energy consumption information devices. A few days ago, Chinese scientists have successfully created a polariton "transistor", which has significantly improved the ability of light manipulation at the nanometer scale, and is expected to further improve the performance of the optoelectronic fusion system.

CTOnews.com learned that the study was completed by Dai Qing, a researcher at the National Nanoscience Center, and the relevant results were published online in the international academic journal Science on the 10th.

According to the official account of the National Nanoscience Center, the Dai Qing research team of the National Nanoscience Center put forward a new idea of using polaritons as optoelectronic interconnection media to give full play to its advantages of high light compression and easy regulation. The construction of the optical-polariton-electric conversion path is equivalent to transforming the toll station of the highway into an overpass, which has significant advantages: first, it has high efficiency, and the efficiency of optically / electrically excited material surface waves has great potential compared with the photoelectric effect; second, the degree of integration is high, and the conversion of light waves into material surface waves can easily break through the diffraction limit by a hundred times of wavelength compression, thus significantly improving the integration of optical modules. Third, the calculation power is strong, and the material surface waves with photon properties can be calculated in parallel with high efficiency, so as to expand the existing optoelectronic fusion "optical transmission, electrical computing" to "optical transmission, electrical computing + optical computing" to achieve the effect of "1x 1 > 2".

In their recent research work, Dai Qing's research group and collaborators discovered the "axial dispersion" effect of polaritons (Nat) in low symmetry crystals. Nanotech. 2023 ~ (18) ~ (64), solved the problem of long-range transmission of graphene polaritons (Nat. Commun. 2022, 13: 1465), and proposed a new mechanism of heterojunction regulating polaritons (Nat. Nanotech. 2022pr 17940).

On this basis, the research team designed and constructed graphene / molybdenum oxide van der Waals heterojunctions in micro-and nano-scale, giving full play to the nano-photonic properties of different materials, in which the atomic layer thickness provides the basis for highly compressed optical modes. Van der Waals stacking satisfies the near-field matching of mode hybrid, and the linear performance band structure provides a platform for gate voltage modulation. Furthermore, the function of "phototransistor" is realized by using one kind of polariton to control another kind of polariton switch. The research shows that the transistor can realize the dynamic control of positive and negative refraction of light, which provides the basis for the construction of optical logic units such as non-gate and non-gate. In application, this research is oriented to the great demand of large-scale integration of optoelectronic fusion devices, which lacks efficient and compact optoelectronic interconnection, and provides a new idea for solving the problem of efficient optoelectronic modulation under the diffraction limit.

Picture:. According to the basic principle of polariton transistor, van der Waals heterojunction is constructed by covering graphene on molybdenum oxide, and the antenna excitates polariton transmission through the interface to form negative refraction.

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