Localized surface plasmon resonance (LSPR) excitation on the photochromic reaction of a diarylethene derivative (DE) was studied by surface enhanced Raman scattering (SERS). UV and visible light irradiations transform reversibly DE between open‐form (OF) and closed‐form (CF) isomers, respectively. A mixture of PMMA and DE (either OF or CF isomer) was spin‐coated onto gold nanorods (GNRs) arrays, designed by electron beam lithography, with two localized surface plasmon resonances (LSPR) at distinct wavelengths, due to their anisotropy. The photochromic reaction rates from CF to OF isomers, under LSPR excitation, were monitored from SERS spectral changes under different polarizations, on the same GNR substrate to compare the effect of LSPR field strength. It appears that the photoisomerization rate was faster when LSPR was excited with the polarization parallel to the GNR long axis. The present results highlight a potential genuine mechanism, from near field LSPR excitation, involved in the photochromic enhancement of diarylethene photochromes.

中文翻译：

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金纳米粒子的规则阵列上的局部表面等离子体共振激发引起的二芳基乙烯增强的光致变色现象。

通过表面增强拉曼散射（SERS）研究了对二芳基乙烯衍生物（DE）的光致变色反应的局部表面等离子体激元共振（LSPR）激发。紫外线和可见光辐射分别在开放形式（OF）和封闭形式（CF）异构体之间可逆地转化DE。将PMMA和DE（OF或CF异构体）的混合物旋涂到金纳米棒（GNR）阵列上，该阵列由电子束光刻设计，由于它们的各向异性，在不同的波长具有两个局部表面等离子体共振（LSPR）。在相同的GNR底物上，通过不同极化下的SERS光谱变化监测LSPR激发下CF到OF异构体的光致变色反应速率，以比较LSPR场强的影响。当LSPR以平​​行于GNR长轴的偏振态激发时，光异构化速率似乎更快。目前的结果突出了潜在的真正机制，来自近场LSPR激发，参与了二芳基乙烯光致变色剂的光致变色增强。