Second-order nonlinear optical switching with a record-high contrast for a photochromic and thermochromic bistable crystal.
Second-order nonlinear optical switching with a record-high contrast for a photochromic and thermochromic bistable crystal.
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光致变色和热致变色双稳态晶体具有创纪录高对比度的二阶非线性光学开关
DOI：
10.1039/c7sc01228d
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发表时间：
2017-11-01
期刊：
影响因子：
8.4
通讯作者：
Guo GC
中科院分区：
文献类型：
--
作者：
Xing XS;Sa RJ;Li PX;Zhang NN;Zhou ZY;Liu BW;Liu J;Wang MS;Guo GC
第一个同时具有光致和热致shg开关行为的双稳态NLO晶体化合物显示出创纪录的高光致shg开关对比度。非线性光学（NLO）可切换材料在光子和光电子技术中具有重要意义。作为研究最多的物理开关方法，NLO光电开关的一个重要问题是如何提高晶体中二次谐波产生（SHG）的开关对比度，因为已知值通常低于3倍。热开关作为另一种方法，已经显示出令人印象深刻的高SHG开关对比度（4 -∞倍），但是热诱导状态的快速衰减需要恒定的热源来维持特定的SHG强度。我们合成了一种光致变色和热致变色双稳定的非中心化合物β-[(MQ)ZnCl3] （MQ+ = n -甲基-4,4 ' -联吡啉），它代表了第一个具有光致和热致shg开关行为的晶体化合物，也是第一个在没有任何热源的情况下可以保持其预期的二阶NLO强度的热可切换NLO晶体的例子。激光辐照后shg开关对比度可达8倍左右，热退火后可达2倍左右。前者的值是光开关NLO晶体的最高记录。这项工作还表明，通过提高电子转移效率、改变永久偶极矩和自吸收，可以获得更高的shg开关对比度。
The first bistable NLO crystalline compound with both photo- and heat-induced SHG-switching behavior shows a record-high photoinduced SHG-switching contrast. 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, variation of permanent dipole moment, and self-absorption.
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影响因子：
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作者：
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影响因子：
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通讯作者：
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