Nondestructive Probing of a Photoswitchable Dithienylethene Coupled to Plasmonic Nanostructures
Nondestructive Probing of a Photoswitchable Dithienylethene Coupled to Plasmonic Nanostructures
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DOI：
10.1021/acs.jpcc.7b05558
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发表时间：
2017-07
影响因子：
3.7
通讯作者：
Christian Schörner;D. Wolf;T. Schumacher;Peter Bauer;M. Thelakkat;M. Lippitz
中科院分区：
文献类型：
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作者：
Christian Schörner;D. Wolf;T. Schumacher;Peter Bauer;M. Thelakkat;M. Lippitz
我们展示了光开关分子的构象状态的读出，而不修改该状态的读出过程本身。开环和闭环反应不仅改变分子层的吸收光谱，而且改变其折射率。将二噻吩基乙烯衍生物的薄层与精心设计的金纳米结构结合。这些纳米结构的粒子等离子体共振对环境中的光致变化极其敏感，因此可以用于探测光致变色开关的状态。探测波长现在询问等离子体结构，而不是分子膜，并且因此可以方便地放置在透明光谱范围内，例如，近红外线我们发现实验和数值模拟之间的等离子体共振的光谱签名很好的协议。
We demonstrate the read-out of the conformational state of photoswitchable molecules, without modifying that state by the read-out process itself. The ring-opening and ring-closing reactions change not only the absorption spectrum of a molecular layer but also its index of refraction. A thin layer of a dithienylethene derivative was combined with well-designed gold nanostructures. The particle plasmon resonance of these nanostructures is extremely sensitive to the photoinduced change in the environment and can therefore be used to probe the state of the photochromic switch. The probing wavelength now interrogates the plasmonic structure, not the molecular film, and can thus be conveniently placed in a transparent spectral range, e.g., the near-infrared. We find good agreement between experiments and numerical simulations with regard to spectral signatures of the plasmon resonance.