Few-Molecule Strong Coupling with Dimers of Plasmonic Nanoparticles Assembled on DNA,ACS Nano

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Few-Molecule Strong Coupling with Dimers of Plasmonic Nanoparticles Assembled on DNA
ACS Nano ( IF 15.8 ) Pub Date : 2021-09-01 , DOI: 10.1021/acsnano.1c04552
Jeanne Heintz ₁ , Nemanja Markešević ₁ , Elise Y Gayet ₁ , Nicolas Bonod ₂ , Sébastien Bidault ₁

Affiliation

Hybrid nanostructures, in which a known number of quantum emitters are strongly coupled to a plasmonic resonator, should feature optical properties at room temperature such as few-photon nonlinearities or coherent superradiant emission. We demonstrate here that this coupling regime can only be reached with dimers of gold nanoparticles in stringent experimental conditions, when the interparticle spacing falls below 2 nm. Using a short transverse DNA double-strand, we introduce five dye molecules in the gap between two 40 nm gold particles and actively decrease its length down to sub-2 nm values by screening electrostatic repulsion between the particles at high ionic strengths. Single-nanostructure scattering spectroscopy then evidence the observation of a strong-coupling regime in excellent agreement with electrodynamic simulations. Furthermore, we highlight the influence of the planar facets of polycrystalline gold nanoparticles on the probability of observing strongly coupled hybrid nanostructures.

中文翻译：

与组装在 DNA 上的等离子体纳米粒子二聚体的少分子强偶联

混合纳米结构，其中已知数量的量子发射器与等离子体共振器强耦合，在室温下应具有光学特性，例如少光子非线性或相干超辐射发射。我们在这里证明，当粒子间距低于 2 nm 时，只有在严格的实验条件下，金纳米粒子的二聚体才能达到这种耦合机制。使用短的横向 DNA 双链，我们在两个 40 nm 金颗粒之间的间隙中引入了五个染料分子，并通过在高离子强度下筛选颗粒之间的静电排斥，主动将其长度降低到亚 2 nm 值。然后，单纳米结构散射光谱证明了强耦合机制的观察与电动模拟非常吻合。此外，

更新日期：2021-09-28

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