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424 results on '"Zhao, Sangen"'

15. A Ferroelectric Nonlinear Optical Crystal for Deep‐UV Quasi‐Phase‐Matching.

Author

Song, Yipeng, Yu, Hongwei, Li, Bingxuan, Li, Xiaoqi, Zhou, Yang, Li, Yanqiang, He, Chao, Zhang, Ge, Luo, Junhua, and Zhao, Sangen

Subjects
SINGLE crystals, CRYSTALS, NONLINEAR optical materials, LASER damage, REFRACTIVE index
Abstract

Phase matching is indispensable for high efficiency of second‐order nonlinear optical (NLO) crystals. Thousands of these crystals rely on birefringence phase matching, whereas only a few of them are quasi‐phase matching without the restriction of birefringence. Herein, using oriented seeds inch‐sized LiNH4SO4 (LAS) single crystals are successfully grown. LAS is NLO‐active with a very short deep‐UV absorption edge of 171 nm and high laser damage threshold up to 1.47 GW cm−2 at 1064 nm, 10 ns, but its birefringence is merely 0.0078@532 nm, which is too small to realize birefringence phase matching in deep‐UV region. Fortunately, P−E hysteresis loop, variable‐temperature NLO tests, and ferroelectric domain observations confirm that LAS is ferroelectric. Furthermore, LAS exhibits small refractive index dispersion resulting in a relatively long periodic length of 1.4 µm and its single domain structure can be easily obtained by electrical poling. These attributes make LAS a scarce NLO candidate for deep‐UV quasi‐phase matching. This work highlights the longly overlooked potential of sulfates and provides new opportunities for deep‐UV NLO materials. [ABSTRACT FROM AUTHOR]

Published
2024
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30. Maximizing the linear and nonlinear optical responses of alkaline tricyanomelaminate

Author

Li, Yanqiang, Wu, Qingchen, Lin, Zheshuai, Liu, Youchao, Zhou, Yang, Chen, Xin, Li, Minjuan, Hong, Maochun, Luo, Junhua, and Zhao, Sangen

Abstract

High-performance bi-functional materials are in urgent demand for the next-generation integrated optical devices. In this work, we successfully synthesized the first tricyanomelaminate with bi-functional optical responses, namely Cs3C6N9•H2O (I), from its analogue Na3C6N9•3H2O by a facile ion exchange method. In contrast to Na3C6N9•3H2O, Irealizes an optimal arrangement of π-conjugated (C6N9)3−anion groups in its crystal structure. As a result, the second-order nonlinear optical (NLO) response is greatly enhanced from nearly zero of Na3C6N9•3H2O to ∼9.8 × KH2PO4of I. Furthermore, Iexhibits a giant linear optical anisotropic response (i.e. birefringence) of 0.52 at the wavelength of 550 nm. Both responses are almost the largest among the inorganic compounds of π-conjugated rings, which indicates that Ihas great potential as a bi-functional optical crystal. Structural and theoretical analyses reveal the microscopic origin of excellent optical properties. This work would attract a lot of interest to the persistently neglected potential of tricyanomelaminates as linear optical and NLO crystals.

Published
2023
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40. C10H6NO2Cd(NO3)·2H2O: a birefringent crystal with an enlarged band-gap derived from covalent edge-sharing connection.

Author

Wang, Yu, Shen, Yaoguo, Huang, Weiqi, and Zhao, Sangen

Subjects
CRYSTALS, BAND gaps, RAW materials, POLYHEDRA, COORDINATION polymers
Abstract

A new birefringent crystal, C10H6NO2Cd(NO3)·2H2O, was designed by combining a π-conjugated [C10H6NO2]− group with a CdO7N polyhedron. Notably, the experimental energy gap is 0.02 eV higher than that of the organic raw material, which resulted from a covalent edge-sharing connection, implying a new strategy to improve the band-gap of birefringent materials. [ABSTRACT FROM AUTHOR]

Published
2023
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45. A Hybrid Halide Perovskite Birefringent Crystal

Author

Huang, Weiqi, primary, Zhang, Xu, additional, Li, Yanqiang, additional, Zhou, Yang, additional, Chen, Xin, additional, Li, Xiaoqi, additional, Wu, Fafa, additional, Hong, Maochun, additional, Luo, Junhua, additional, and Zhao, Sangen, additional

Published
2022
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49. A High‐Performance Nonlinear Optical Crystal with a Building Block Containing Expanded π‐Delocalization.

Author

Li, Yanqiang, Huang, Weiqi, Zhou, Yang, Song, Xianyu, Zheng, Jieyu, Wang, Han, Song, Yipeng, Li, Minjuan, Luo, Junhua, and Zhao, Sangen

Subjects
CRYSTALS, BAND gaps, OPTICAL properties, BIREFRINGENCE
Abstract

Common nonlinear optical (NLO) crystals consist of traditional functional building blocks with inherent optical limitation. Herein, inspired by traditional (B3O6)3− inorganic building block, we theoretically identified a new type of organic functional building blocks and then successfully synthesized the first cyamelurate NLO crystal, Ba(H2C6N7O3)2 ⋅ 8 H2O. To our surprise, the constituent (H2C6N7O3)− building block is not in structurally optimal arrangement, but Ba(H2C6N7O3)2 ⋅ 8 H2O exhibits excellent optical properties including wide band gap of 4.10 eV, very large birefringence of 0.24@550 nm, and exceptionally strong second‐harmonic generation (SHG) response of about 12×KH2PO4. Both the SHG response and birefringence are much larger than those of commercial NLO crystal β‐BaB2O4 with optimally aligned (B3O6)3− building block. Theoretical calculations suggest that the expanded π‐conjugation delocalization within (H2C6N7O3)−vs (B3O6)3− should be responsible to the enhanced performance. This work implies that there is still much room to develop new NLO crystals with excellent functional building blocks that may be longly neglected. [ABSTRACT FROM AUTHOR]

Published
2023
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