金属-有机-金属电激发表面等离激元器件

在p型硅衬底上, 制备了金属-有机-金属(metal-organic-metal, MOM)电激发表面等离激元器件。器件结构是p-Si/Au/V₂O₅/NPB/Alq₃:DCM/Sm/Au, 掺杂DCM的Alq₃为发光层。高倍显微镜下, 器件侧面发光图像显示, 绝大部分光被限制在双金层结构波导中传播。采用微区共焦拉曼光谱仪, 分别测量了侧面出射的非偏振模式、TM模式和TE模式电致发光谱。TM模式强度约为TE模式强度的2倍。分析认为, 具有TM偏振特性的表面等离激元(surface plasmon polariton, SPP)在侧面电致发光中起重要作用。 发光体的能量耗散谱表明SPP模式能量约占总能量65%。利用时域有限差分法(finite-different time-domain, FDTD)对简化结构进行模拟, 得到了泄漏模和SPP模式的二维电场强度分布。

Electrically-Pumped Metal-Organic-Metal Plasmonic Emitter

A metal-organic-metal (MOM) plasmonic emitter with the p-type Si substrate and the active layer of Alq₃: DCM is reported. The device structure is p-Si/Au/V₂O₅/NPB/Alq₃:DCM/Sm/Au. The optical image of edge emission indicates that most of the light is well confined to the MOM waveguide. Light is collected with a confocal μ-Raman spectrometer. The TM mode is more intense than the TE mode by a factor of 2, which can be attributed to the contribution of surface plasmon polariton (SPP). The power dissipation spectrum is computed based on a simplified MOM structure of Au/organic/Au. By integrating the power of the SPP modes in the spectrum, the fraction of the total power coupled to SPP modes is 65%. The electric-field-intensity distribution and the loss coefficients are computed by finite-different time-domain (FDTD) method.