论文标题
等离子增强金属光致发光的purcell因子
Purcell factor for plasmon-enhanced metal photoluminescence
论文作者
论文摘要
我们提出了一个分析模型，用于在金属纳米结构中具有特征大小低于衍射极限的金属光致发光（MPL）的等离子体增强。在这样的系统中，MPL增强的主要机制是通过重组载体，然后由于LSP辐射衰减而引起的光子发射来激发局部表面等离子体（LSP）。对于任意形状的等离子体纳米结构，我们获得了MPL percell因子的通用表达，它描述了MPL在金属介电函数，LSP频率和系统体积方面的等离子体增强。我们发现，MPL光谱的线形受到直接载体重组过程与血浆天线介导的载体之间的干扰，这导致MPL光谱带相对于LSP光谱带的蓝光相对于LSP谐振在许多实验中观察到的散射光谱。
We present an analytical model for plasmonic enhancement of metal photoluminescence (MPL) in metal nanostructures with characteristic size below the diffraction limit. In such systems, the primary mechanism of MPL enhancement is excitation of localized surface plasmons (LSP) by recombining carriers followed by a photon emission due to LSP radiative decay. For plasmonic nanostructures of arbitrary shape, we obtain a universal expression for MPL Purcell factor that describes the plasmonic enhancement of MPL in terms of metal dielectric function, LSP frequency, and the system volume. We find that the lineshape of MPL spectrum is affected by the interference between direct carrier recombination processes and those mediated by plasmonic antenna which leads to a blueshift of MPL spectral band relative to LSP resonance in scattering spectra observed in numerous experiments.
