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

Thanks to CTOnews.com netizens Orange Baba and X42 for the clue delivery! CTOnews.com, September 15, according to the official Wechat account of Nanjing University, on the night of September 14, the top international academic journal Nature published a major breakthrough in the next generation of optoelectronic chip manufacturing by the scientific research team led by Zhang Yong, Xiao Min and Zhu Shining of Nanjing University. The research team invented a new type of "non-reciprocal femtosecond laser polarized ferroelectric domain" technology, which focuses the femtosecond pulse laser on the crystal of the material "lithium niobate" and forms an effective electric field inside the crystal by controlling the direction of laser movement. realize the direct writing and erasure of three-dimensional structure. This new technology breaks through the optical diffraction limit of traditional femtosecond laser and reduces the size of the three-dimensional structure of lithium niobate from 1 micron (equivalent to 1/50 of hair) to 30 nanometers for the first time. The machining accuracy is greatly improved.

This important invention may open up a new race track for optoelectronic chip manufacturing in the future, and is expected to be used in the preparation of key optoelectronic devices such as photoelectric modulator, acoustic filter, non-volatile ferroelectric memory and so on. it has a wide application prospect in 5G / 6G communication, optical computing, artificial intelligence and other fields.

This work organically combines femtosecond laser polarization technology with lithium niobate ferroelectric domain engineering, breaks through the barrier of traditional technology, and realizes the controllable preparation of nanometer ferroelectric domain in three-dimensional space for the first time. It can be used in the field of quantum optics to achieve efficient, high-dimensional and narrow linewidth quantum entanglement; in the field of electronics, it can promote the development of high-performance ferroelectric domain wall nanoelectronic devices, such as large-capacity rewritable non-volatile memory; in the field of acoustics, nanoperiodic ferroelectric domain structures can realize ultra-high frequency acoustic resonators and filters. Femtosecond laser polarization technology can be further applied to other ferroelectric crystals, including lithium tantalate and potassium titanium phosphate, and promote the development of high-performance three-dimensional optical, acoustic and electrical integrated devices.

Femtosecond laser 3D printing of nanometer ferroelectric domain

CTOnews.com learned that the research work was supported by the National key Research and Development Program of the Ministry of Science and Technology, the National Natural Science Foundation of China, the State key Laboratory of solid Microstructure Physics and the Cooperative Innovation Center of artificial Microstructure Science and Technology.

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