ENGINEERING TECHNOLOGY

Xi’an Jiaotong University and others obtain the ideal layered domain structure of electro-optical crystals The results of the research were published in Science


a. Pin-PMN-PT single crystal electro-optical coefficient compared with other crystals, the upper left picture is the PIN-PMN-PT crystal photo; b. Electro-optical Q switch developed based on PIN-PMN-PT single crystal, as a comparison, the figure gives the commercial DKDP single crystal and lithium niobate single crystal electro-optical switch photo and working voltage. Courtesy of the author of the paper

Electro-optical crystal is the core key material in important electro-optical devices such as electro-optical modulators, electro-optical switches, and electronically controlled beam deflectors, and is widely used in cutting-edge technologies such as optical fiber gyroscopes, lidar, and quantum communications. At present, the development trend of miniaturization, lightweighting, integration, low drive voltage and low power consumption of electro-optical devices puts forward higher requirements for the electro-optical performance of crystals.

Perovskite ferroelectric single crystals represented by lead titanate-based relaxation ferroelectric bodies can have excellent electro-optical properties through engineering domain design, and their primary electro-optical coefficient can reach more than 200 pm/V, which is an order of magnitude higher than traditional electro-optical crystals such as lithium niobium oxide (LiNbO3) and potassium deuterium phosphate (DKDP), showing great prospects for application in the field of electro-optics. Professor Xu Zhuo of Xi’an Jiaotong University introduced, “However, there are often ferroelectric domain walls that scatter light in the single crystal of engineering domains, which significantly weakens the crystal transmittance and makes it difficult to obtain high light transmittance and high electro-optical properties at the same time.” ”

“In addition, the walls of such ferroelectric domains are easily movable under the external electric field, which affects the stability of electro-optical properties, thus limiting the application of engineering domain structure ferroelectric crystals in the field of electro-optical.” Xu Zhuo further pointed out.

In view of the above problems, the research team of Xu Zhuo and Professor Li Fei of Xi’an Jiaotong University cooperated with Harbin Institute of Technology, the University of Wollongong in Australia, Soochow University, the University of New South Wales and other units to obtain the ideal layered domain structure through the collaborative design of crystal cutting, crystal composition and polarization process in lead niobium indiumate-lead niobium magnesiumate-lead titanate (PIN-PMN-PT) relaxation ferroelectric single crystal.

On April 22, its latest research results were published in science (scienceJournals are published online.

According to the paper, the domain structure is both preserved to be able to make[011]The oriented crystal has a high electro-optical effect of the 710 ferroelectric domain wall, while eliminating the 1090 ferroelectric domain wall in the crystal that has a scattering effect on light. The PIN-PMN-PT relaxation ferroelectric single crystal primary electro-optical coefficient r33 reaches 900pm/V, which is more than 30 times that of the current lithium niobate electro-optical crystal; the crystal transmittance can reach 99.6% (coated with anti-reflection film samples).

In addition, the research team also used PIN-PMN-PT relaxation ferroelectric single crystal to develop a new type of electro-optical Q switch, in the output of optical energy, optical pulse width and other performance indicators and commercial DKDP and LiNbO3 crystal electro-optical opening, PIN-PMN-PT single crystal electro-optical switch size and driving voltage has been greatly reduced.

Experts and reviewers in this field believe that this research work is a solid step forward for the application of relaxation ferroelectric single crystals in the field of electro-optical technology. In addition to low drive voltage, miniaturized electro-optical switches, PIN-PMN-PT crystals are also expected to promote the development of many other high-performance electro-optical devices, including new high-speed optical phased arrays, electronically controlled beam scanners, small electro-optical modulators in fiber optic gyroscopes, frequency conversion devices, and autonomous driving lidar.

It is understood that Xi’an Jiaotong University is the first unit of the paper, and the first author of the paper is Liu Xin, postdoctoral fellow of the School of Electronics, Faculty of Telecommunications, Xi’an Jiaotong University, and Associate Professor Tan Peng of Harbin Institute of Technology. Professor Li Fei of Xi’an Jiaotong University, Professor Tian Hao of Harbin Institute of Technology and Professor Zhang Shujun of the University of Wollongong in Australia are the corresponding authors of the paper. Professor Xu Zhuo and Wei Xiaoyong of Xi’an Jiaotong University, Professor Xu Bin of Soochow University, Professor Wang Danyang of the University of New South Wales, and Professor Chen Longqing of Pennsylvania State University are the co-authors of the paper

This research work is supported by the National Natural Science Foundation of China, the National Key Research and Development Program, and the Young Top Talents Program of Xi’an Jiaotong University. (Source: China Science Daily, Zhang Xingyong, Cui Kejia)

Related paper information:https://doi.org/10.1126/science.abn7711



Source link

Related Articles

Leave a Reply

Your email address will not be published. Required fields are marked *

Back to top button