Chiral plasmonic DNA nanostructures with switchable circular dichroism.
Chiral plasmonic DNA nanostructures with switchable circular dichroism.
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DOI：
10.1038/ncomms3948
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发表时间：
2013
影响因子：
16.6
通讯作者：
Liedl, Tim
中科院分区：
文献类型：
--
作者：
Schreiber, Robert;Ngoc Luong;Fan, Zhiyuan;Kuzyk, Anton;Nickels, Philipp C.;Zhang, Tao;Smith, David M.;Yurke, Bernard;Kuang, Wan;Govorov, Alexander O.;Liedl, Tim
自然产生的分子的圆二色谱和等离子体粒子的合成手性排列的圆二色谱通常表现出特征的双符号形状。这种光谱由靠近凹陷的峰组成(反之亦然)，并且由来自溶液中随机取向的许多单独的手性物体的信号叠加而成。在这里，我们表明，通过首先对齐然后切换附着在底物上的DNA折纸支架纳米颗粒螺旋的取向，我们能够在对应于相对于光束的垂直或平行螺旋取向的两个不同的圆形二向色性光谱之间可逆地切换光学响应。我们观测到的可开关等离子体材料的定向圆二向色性与基于偶极近似理论的预测很好地一致。这种动态超材料将功能引入基于软物质的光学设备，并可实现新颖的数据存储方案或信号调制器。用DNA折纸方法排列的纳米螺旋中的等离子体激元共振可以在可见光波长处产生强烈的圆二向色性。Schreiber等人。结果表明，对齐然后切换这种纳米螺旋的取向能够实现二向色性响应的可逆切换。
Circular dichroism spectra of naturally occurring molecules and also of synthetic chiral arrangements of plasmonic particles often exhibit characteristic bisignate shapes. Such spectra consist of peaks next to dips (or vice versa) and result from the superposition of signals originating from many individual chiral objects oriented randomly in solution. Here we show that by first aligning and then toggling the orientation of DNA-origami-scaffolded nanoparticle helices attached to a substrate, we are able to reversibly switch the optical response between two distinct circular dichroism spectra corresponding to either perpendicular or parallel helix orientation with respect to the light beam. The observed directional circular dichroism of our switchable plasmonic material is in good agreement with predictions based on dipole approximation theory. Such dynamic metamaterials introduce functionality into soft matter-based optical devices and may enable novel data storage schemes or signal modulators. Plasmonic resonances in nanoparticle helices arranged by the DNA origami method can give rise to strong circular dichroism at visible wavelengths. Schreiber et al. show that aligning and then toggling the orientation of such nanoparticle helices enables reversible switching of the dichroic response.
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