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首页> 外文会议>International Semiconductor Device Research Symposium;ISDRS '09 >Surface plasmon polariton enhanced fluorescence from quantum dots on nanostructured metal surfaces
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Surface plasmon polariton enhanced fluorescence from quantum dots on nanostructured metal surfaces

机译：表面等离子体激元极化增强了纳米结构金属表面上量子点的荧光

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Over the course of the past decade surface plasmon polaritons (SPP's) have garnered increasing attention in the scientific community. These are surface wave solutions to Maxwell's Equations at the boundary between semi-infinite dielectric and metallic regions. They are localized and propagate in the plane of the interface and are characterized by strongly enhanced fields near the boundary, which decay exponentially away from the surface. Field enhancement near the boundary plays a critical role in surface enhanced effects with enhancements reaching up to 100 times or greater compared to propagating waves in either medium. Because of this strong local field enhancement, structures and surfaces supporting SPPs are capable of significant enhancements of optical effects taking place in the vicinity of the boundary. It is well known that the presence of a metal surface in close proximity to a fluorophore can significantly modify its emission. This modification has been attributed to several factors and depends strongly on the distance separating the fluorophore and metal. For large separations particle emission is not affected and approaches a steady state value representing the fluorophore emitting in the absence of any boundary. As the separation is decreased, nonradiative relaxation of the excited fluorophore occurs as energy is coupled into surface plasmons (SPPs or localized plasmons) on the surface of the metal. For very small separations, quenching of emission is well known and is attributed to damping of dipole oscillators and coupling of energy into evanescent waves at the surface of the metal. While coupling to surface plasmons is viewed as an undesirable loss mechanism for experiments that rely on emission from fluorophores, the interaction of surface plasmons with fluorophores may be used to modify and enhance their utility. Coupling of excited fluorophores into surface plasmons is well known to occur for intermediate metal-particle separations. This effect-n is the basis for surface plasmon coupled emission (SPCE) which takes advantage of coupling between excited emitters and surface plasmons to excite surface plasmons that are then scattered into photons and detected. Conversely, by placing emitters in close proximity to surface plasmon supporting substrates it is also possible to increase their emission by taking advantage of localized high surface fields.
机译：在过去的十年中，表面等离激元极化子（SPP）引起了科学界的越来越多的关注。这些是半无限电介质和金属区域之间边界处麦克斯韦方程组的表面波解决方案。它们在界面的平面内局部化并传播，其特征是边界附近的场强增强，场远离表面呈指数衰减。边界附近的场增强在表面增强效应中起着至关重要的作用，与在两种介质中传播的波相比，增强高达100倍甚至更高。由于这种强烈的局部场增强，支撑SPP的结构和表面能够显着增强边界附近发生的光学效应。众所周知，紧邻荧光团的金属表面的存在可以显着改变其发射。该修饰归因于几个因素，并且强烈取决于荧光团和金属之间的距离。对于较大的分离，粒子发射不会受到影响，并接近表示没有任何边界发射的荧光团的稳态值。随着分离的减小，当能量耦合到金属表面的表面等离激元（SPPs或局部等离激元）中时，激发的荧光团发生非辐射弛豫。对于非常小的分离，发射淬灭是众所周知的，这归因于偶极振荡器的阻尼以及能量在金属表面耦合成into逝波。尽管对于依赖于荧光团发射的实验，与表面等离子体激元的耦合被认为是不希望的损失机制，但是表面等离子体激元与荧光团的相互作用可用于修饰和增强其效用。对于中间金属-颗粒分离，众所周知发生激发的荧光团到表面等离子体激元的耦合。该效应n是表面等离激元耦合发射（SPCE）的基础，它利用激发的发射器和表面等离激元之间的耦合来激发表面等离激元，然后将其扩散到光子中并进行检测。相反，通过将发射器放置在紧邻表面等离激元支撑衬底的位置，也可以通过利用局部高表面场来增加其发射。

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