Moderate fabrication and characterization of the microcrystalline Sr2CuO3 glass films with effective nonlinearities

Tao Xu,Weidong Xiang,Xiaojuan Liang,Jutao Jiang,Guangcai Hu,Run Xiang,Congfei Yin

doi:10.1038/s41598-018-27967-0

Tao Xu, Weidong Xiang + Show 5 more

Open Access

https://doi.org/10.1038/s41598-018-27967-0

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Journal: Scientific Reports	Publication Date: Jun 22, 2018
Citations: 1	License type: open-access

Affiliation: Wenzhou University

Abstract

Since nonlinear optical materials used in the ultrafast all-optical switching is an important part for the modern optical technology, cuprates have been widely investigated for their specific Cu-O chain structure and intriguing optical properties. We present a new preparation method of microcrystalline Sr2CuO3 glass films on glass substrates combining spin-coating and co-sintering techniques. Then, the as-prepared samples were polished for different times to obtain microcrystalline Sr2CuO3 glass films with varying thickness. The influence of polishing time on the structure, the valence state and the nonlinear optical response were discussed, respectively. The purity of the Sr2CuO3 phase, surface morphology and the chemical composites of these synthesized glass films were given with scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS), X-ray powder diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). Importantly, optical absorption spectroscopy and Z-scan technique were used to measure linear absorption and third-order optical nonlinearity of the films. The experiments showed that third-order nonlinear susceptibility of the 140 min polished film sample with a thickness of 18 μm was up to 1.23 × 10−12 esu, indicating its potential application in the nonlinear field.

Highlights

In recent decades, cuprates with one-dimensional electronic structure have been of particular importance in superconductivity and nonlinear optics due to the extreme CuO2 structure and the motion of electrons in a confined space[1,2,3]
The as-prepared films reveal that the gray microcrystalline Sr2CuO3 particles were tightly embedded in the Pb-glass layer, which were fabricated by using co-sintering the original materials, and they were adhered to the surfaces in the K9 glass substrates
The unique structure and steerable thickness of the as-synthesized film samples have a large impact on the valence state and the nonlinear optical response, which will be discussed below

Summary

Introduction

Cuprates with one-dimensional electronic structure have been of particular importance in superconductivity and nonlinear optics due to the extreme CuO2 structure and the motion of electrons in a confined space[1,2,3]. Sr2CuO3 powder is mostly synthesized through the traditional solid state method, and the electronic structure and superconductivity of the related materials are investigated[16,17,18,19,20]. These studies had been devoted to understand the structure and size of Sr2CuO3 particles, lacking the exploration in nonlinear applications field. The research of the thickness dependence of structure and optical property for the microcrystalline Sr2CuO3 films is seldom reported. Thickness dependence of structure and optical property for the microcrystalline Sr2CuO3 glass films were investigated in detail. The final Z-scan experiment showed that the 140 min polished microcrystalline Sr2CuO3 glass film with a thickness of 18 μm owned a fast nonlinear response, could be a suitable nonlinear optical candidate compared to some known materials[28]

Methods

Results

Conclusion