Kluczyk-Korch Katarzyna, Jacak Lucjan, Jacak Witold Aleksander, David Christin
Department of Quantum Technologies, Faculty of Fundamental Problems of Technology,Wrocław University of Science and Technology, 50-370 Wrocław, Poland.
Department of Electronics Engineering, University of Rome Tor Vergata, Via del Politecnico 1,00133 Rome, Italy.
Nanomaterials (Basel). 2019 Aug 27;9(9):1206. doi: 10.3390/nano9091206.
We study strong optical coupling of metal nanoparticle arrays with dielectric substrates. Based on the Fermi Golden Rule, the particle-substrate coupling is derived in terms of the photon absorption probability assuming a local dipole field. An increase in photocurrent gain is achieved through the optical coupling. In addition, we describe light-induced, mesoscopic electron dynamics via the nonlocal hydrodynamic theory of charges. At small nanoparticle size (<20 nm), the impact of this type of spatial dispersion becomes sizable. Both absorption and scattering cross sections of the nanoparticle are significantly increased through the contribution of additional nonlocal modes. We observe a splitting of local optical modes spanning several tenths of nanometers. This is a signature of semi-classical, strong optical coupling via the dynamic Stark effect, known as Autler-Townes splitting. The photocurrent generated in this description is increased by up to 2%, which agrees better with recent experiments than compared to identical classical setups with up to 6%. Both, the expressions derived for the particle-substrate coupling and the additional hydrodynamic equation for electrons are integrated into COMSOL for our simulations.
我们研究了金属纳米颗粒阵列与介电基底的强光学耦合。基于费米黄金定则，在假设局部偶极场的情况下，根据光子吸收概率推导出颗粒 - 基底耦合。通过光学耦合实现了光电流增益的增加。此外，我们通过电荷的非局部流体动力学理论描述了光致介观电子动力学。在纳米颗粒尺寸较小（<20 nm）时，这种空间色散类型的影响变得显著。通过额外非局部模式的贡献，纳米颗粒的吸收和散射截面都显著增加。我们观察到跨越十分之几纳米的局部光学模式的分裂。这是通过动态斯塔克效应实现的半经典强光学耦合的特征，即奥特勒 - 汤斯分裂。在此描述中产生的光电流增加了高达2%，与最近的实验相比，这比相同的经典设置（高达6%）更吻合。为了我们的模拟，颗粒 - 基底耦合的推导表达式和电子的附加流体动力学方程都被集成到了COMSOL中。
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