Abstract
Abstract While infrared spectroscopy is a powerful technique that provides molecular information such as chemical constituents and chemical structures of analytes, it suffers from low absorption cross-section resulting in low sensitivity and poor signal-to-noise or signal-to-background ratios. Surface-enhanced infrared absorption (SEIRA) spectroscopy, which is supported by nanometer scale structures, is a promising technology to overcome these problems in conventional infrared (IR) spectroscopy and enhances IR signals using the field enhancement properties of surface plasmon resonance. Recently resonant SEIRA technique was proposed, and signal enhancement factor was significantly improved. In this review, we present an overview of the recent progresses on resonant SEIRA technologies including nanoantenna- and metamaterial-based SEIRA, and also SEIRA techniques with nanoimaging capabilities.
Highlights
Spectroscopy is a powerful optical and photonic technique
We present an overview of the recent progresses on resonant Surface-enhanced infrared absorption (SEIRA) technologies including nanoantenna- and metamaterial-based SEIRA, and SEIRA techniques with nanoimaging capabilities
Conventional SEIRAs using metallic or dielectric nanostructures boosts the signal amplitude of IR absorption of molecules; it cannot probe IR vibrational information with the nanoscale spatial resolution since, in such enhanced IR spectroscopy, optical signals derived from multiple nanostructures within a diffraction-limited laser spot are detected
Summary
Spectroscopy is a powerful optical and photonic technique. It provides large amounts of information. It is difficult to measure a small number of analyte molecules To solve this problem, several efforts have been made, and many signal-enhancing techniques, such as attenuated total reflectance (ATR) and grazing incidence reflectance, have been developed. Reflection absorption spectroscopy (RAS) is a grazing incidence reflectance technique It uses metal plates/films, and the incident light is introduced to the metal surface at a large incident angle with a p-polarized orientation. Using a 6 nm-thick silver (Ag) film, which was randomly arranged Ag nanoislands, deposited on the surface of a silicon ATR prism, an enhancement factor of 20 was achieved Both theoretical and experimental studies on SEIRA have been intensively conducted by Osawa [2]. We review SEIRA-based techniques that have imaging capabilities with nanoscale high spatial resolutions
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