Second-order nonlinear optical switching with a record-high contrast for a photochromic and thermochromic bistable crystal

Chemical Science
Xiu-Shuang XingGuo-Cong Guo

Abstract

Nonlinear optical (NLO) switchable materials are important for photonic and optoelectronic technologies. One important issue for NLO photoswitching, the most studied physical switching approach, is how to improve the switching contrast of second harmonic generation (SHG) in crystals, because the known values are generally below 3 times. Thermoswitching, as another approach, has shown impressive high SHG-switching contrasts (4-∞ times), but the fast decay of thermally induced states demands constant heat sources to maintain specific SHG intensities. We have synthesized a photochromic and thermochromic bistable acentric compound, β-[(MQ)ZnCl3] (MQ+ = N-methyl-4,4'-bipyridinium), which represents the first crystalline compound with both photo- and heat-induced SHG-switching behavior and the first example of a thermoswitchable NLO crystal that can maintain its expected second-order NLO intensity without any heat source. The SHG-switching contrast can reach about 8 times after laser irradiation or 2 times after thermal annealing. The former value is the highest recorded for photoswitchable NLO crystals. This work also indicates that higher SHG-switching contrasts may be obtained through increasing electron-transfer efficiency, varia...Continue Reading

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Citations

Mar 19, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Jun-Ju ShenYun-Long Fu
Nov 28, 2017·Dalton Transactions : an International Journal of Inorganic Chemistry·Xiaonan XueHongwei Hou
Jun 23, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Li SunJie Zhang
Sep 5, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Shu-Biao XiaJian-Jun Liu
Aug 14, 2018·Dalton Transactions : an International Journal of Inorganic Chemistry·Tan-Lai YuYun-Long Fu
Aug 24, 2019·Chemical Communications : Chem Comm·Zhichao ShaoHongwei Hou
Jan 27, 2021·Inorganic Chemistry·Masaya KomineShin-Ichi Ohkoshi
Dec 23, 2020·Dalton Transactions : an International Journal of Inorganic Chemistry·Song-De HanGuo-Ming Wang
Apr 21, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Meng-Hua LiMei-Jin Lin
Jul 10, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Jia Yun ZouGuo-Dong Li
Dec 30, 2017·ACS Applied Materials & Interfaces·Ning-Ning YangEn-Qing Gao
Jan 21, 2020·Journal of the American Chemical Society·Yu-Juan MaGuo-Ming Wang
Oct 8, 2021·Dalton Transactions : an International Journal of Inorganic Chemistry·Gao-Peng LiYunlong Fu
Jan 14, 2022·Chemical Communications : Chem Comm·Xiu-Ni HuaPing-Ping Shi

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Methods Mentioned

BETA
EFISH
X-ray
irradiate
differential scanning calorimetry
ESR
electron spin resonance

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