Abstract

Surface-enhanced infrared absorption (SEIRA) spectroscopy is a powerful technique that overcomes the issue of low molecular absorption cross-sections in infrared spectroscopy. Due to the collective oscillations of electrons in the infrared regime, SEIRA using resonant metamaterial provides greatly enhanced (up to 10⁷) electromagnetic fields extending up to tens of nanometers from the metamaterial. The enhanced near-field enables spectroscopic analysis and ultrasensitive on-chip sensing of molecules. This interesting characteristic has aroused widespread attention from researchers to SEIRA technology, and various SEIRA-based sensing applications have been continuously emerging. Optimization of the signal enhancement to obtain high sensing performance is the developing main thread of SEIRA technology. In this Review, we provide a basic understanding of SEIRA’s sensing mechanism and theoretical model. With this background, several SEIRA optimizing methods are discussed, ranging from design, materials to algorithms. Additionally, perspectives about the future development trends of SEIRA technologies are discussed.

摘要

表面增强红外吸收 (SEIRA) 光谱是一种强大的技术，可以克服红外光谱中分子吸收截面低的问题。由于电子在红外区域的集体振荡，使用共振超材料的 SEIRA 提供了极大的增强（高达 10 ⁷) 电磁场从超材料延伸到数十纳米。增强的近场能够实现分子的光谱分析和超灵敏的片上传感。这一有趣的特性引起了研究人员对SEIRA技术的广泛关注，各种基于SEIRA的传感应用不断涌现。优化信号增强以获得高传感性能是 SEIRA 技术的发展主线。在这篇综述中，我们提供了对 SEIRA 传感机制和理论模型的基本了解。在此背景下，讨论了几种 SEIRA 优化方法，从设计、材料到算法。此外，还讨论了有关 SEIRA 技术未来发展趋势的观点。