Polarization-sensitive optoionic membranes from chiral plasmonic nanoparticles
Polarization-sensitive optoionic membranes from chiral plasmonic nanoparticles
复制标题
手性等离子体纳米粒子极化敏感光离子膜
DOI：
10.1038/s41565-022-01079-3
复制
发表时间：
2022-03-14
影响因子：
38.3
通讯作者：
Kuang, Hua
中科院分区：
文献类型：
--
作者：
Cai, Jiarong;Zhang, Wei;Kuang, Hua
涂有对映体纯苯丙氨酸的手性金纳米颗粒被组装成纳米多孔膜，其离子电导率取决于入射圆偏振光的手性。手性材料薄膜中左右圆偏振光子吸收的光电效应对于直接光电流观察来说通常小得令人望而却步。手性超表面提高了电子对圆偏振的敏感性，但其面外结构需要在制造和性能上进行权衡。在这里，我们表明，由于光诱导的偏振依赖性离子在纳米颗粒界面上的积累，手性纳米颗粒的纳米多孔薄膜能够对圆偏振具有高灵敏度。 L-苯丙氨酸修饰的自组装多层金纳米颗粒在右旋圆偏振光下产生的光电流比左旋圆偏振光下高出2.41倍。产生平面手性等离子体模式的多个纳米粒子之间的强等离子体耦合促进了电子的喷射，厚厚的对映体纯苯丙氨酸层促进了电子在膜-电解质界面处的捕获。所展示的在所有入射角度下以相同灵敏度检测光椭圆率的方法模拟了海洋动物偏振视觉的现象学方面。光电膜中自组装的简单性和偏振检测的敏感性为手性光子学的小型化流体器件系列打开了大门。
Chiral gold nanoparticles coated with enantiomerically pure phenylalanine were assembled into nanoporous membranes, whose ionic conductivity depends on the handedness of the incident circularly polarized light.Optoelectronic effects differentiating absorption of right and left circularly polarized photons in thin films of chiral materials are typically prohibitively small for their direct photocurrent observation. Chiral metasurfaces increase the electronic sensitivity to circular polarization, but their out-of-plane architecture entails manufacturing and performance trade-offs. Here, we show that nanoporous thin films of chiral nanoparticles enable high sensitivity to circular polarization due to light-induced polarization-dependent ion accumulation at nanoparticle interfaces. Self-assembled multilayers of gold nanoparticles modified with l-phenylalanine generate a photocurrent under right-handed circularly polarized light as high as 2.41 times higher than under left-handed circularly polarized light. The strong plasmonic coupling between the multiple nanoparticles producing planar chiroplasmonic modes facilitates the ejection of electrons, whose entrapment at the membrane-electrolyte interface is promoted by a thick layer of enantiopure phenylalanine. Demonstrated detection of light ellipticity with equal sensitivity at all incident angles mimics phenomenological aspects of polarization vision in marine animals. The simplicity of self-assembly and sensitivity of polarization detection found in optoionic membranes opens the door to a family of miniaturized fluidic devices for chiral photonics.