基于多波长共振的表面等离激元传感的研究

Ultra-high sensitive and ultra-small sensors attract tremendous attention in the area of integrated optical sensing recently. Surface plasmon polaritons (SPPs) are electromagnetic fields confined along the metal surface. Because of their subwavelength confinements and enormous field enhancements, the SPPs have important applications in the biological and chemical sensor technology. The optical sensors based on the SPPs exhibited high sensitivities, but they could not eliminate the influence and disturbance of the environment noise. This largely affects the measurement accuracy and limits the applications of the SPP sensors. Aiming at the environment noise, this project will mainly focus on how to use the multi-wavelength resonances and their strong coupling effects in the metal nano-resonator to realize ultra-high sensitive SPP sensors, which are immune to the environment noise. This strategy can broaden the applications of the SPP sensors in real complicated environments. Moreover, these ultra-small SPP sensors can be integrated into chips. Thus, they may find important applications in many areas of the national economy, such as the food industry, medicine engineering, material engineering, and environmental protection. The content of the project contains the theoretical study of the multi-wavelength resonances and coupling effect in the metal nano-resonator, the fabrications of the metal nano-resonator on the metal surface, the optical measurement of the metal nano-resonator, and the accurate sensing measurement immune to the environment noise.

超高灵敏度、超小尺寸的传感器件是目前集成光学传感领域的研究热点之一。表面等离激元是局域在金属表面的电磁波，具有亚波长束缚和巨大的局部场增强效应，因此被广泛应用于生物化学传感技术中。目前基于表面等离激元的高灵敏度传感器件易受环境噪声的干扰，从而影响了它们的测量精度和应用前景。本项目拟针对环境噪声问题，重点瞄准如何利用金属纳米腔中的多波长共振及其耦合效应来实现对环境噪声免疫的、高灵敏度的、高精度的传感测量，从而拓展表面等离激元传感器件在实际复杂环境中的应用范围。这种超小的传感器件容易在芯片内集成，可为国民经济中食品工业、医学工程、材料工程、环境保护等领域提供高灵敏度的、高精度的微剂量检测。研究内容包括：金属表面上纳米腔结构中多波导模式和多共振模式的产生及相互耦合机制的理论研究，金属表面上纳米腔结构的加工和制备，金属纳米腔的光学表征，对环境噪声免疫的高灵敏度、高精度的传感测量。

超高灵敏度、超小尺寸的传感器件是目前集成光学传感领域的研究热点之一。本项目针对高灵敏度表面等离激元碰到的环境噪声问题，重点瞄准如何利用金属纳米腔中的多波长共振及其耦合效应来实现对环境噪声免疫的、高灵敏度的、高精度的传感测量。主要研究内容包括：金属膜上非对称纳米腔、缺陷纳米腔和耦合纳米腔等结构中多波长共振、耦合的物理机制及原理的研究；金属非对称纳米腔、缺陷纳米腔和耦合纳米腔结构的设计和优化；金属纳米腔的加工制备，金属纳米腔结构的多波长共振光学表征；自参考传感测量，在实验上实现微型化、低成本、高灵敏度、对环境噪声免疫、易于集成的高精度传感器件。..在国家基金委面上项目的资助下，该项目严格按照申请书进行，在理论和实验方面取得了一定的成果，已发表SCI论文24篇，影响因子大于6的论文11篇，6篇被选为期刊的正内封面文章，包括一篇包括1篇Advanced Materials (扉页插图)、1篇Laser & Photonics Reviews (内封面)、3篇Advanced Optical Materials (1篇正封面，1篇内封面)、3篇ACS Photonics、2篇Nanoscale (1篇为封底文章)、1篇Nanophotonics；本项目利用金属光栅中表面等离激元产生的双Fano共振在实验上实现了超小的、高灵敏度的自参考传感器，能够从实验上监控并消除由于光强起伏以及局域温度改变带来的误差。这些工作获得了国内外同行的关注和认可，被Chemical Reviews, Advanced Optical Materials, Progress in Quantum Electronics等综述文章正面引用报道。因为申请者在表面等离激元传感器件方面的贡献，申请者最近受Advanced Optical Materials期刊邀请以第一作者身份发表一篇Plasmonic devices综述文章(Plasmonic sensing and modulation based on Fano resonances)，被选为该期刊的正封面文章，并在该期刊的名人堂(Hall of Fame)重点报道。