Low-Background Tip-Enhanced Raman Spectroscopy Enabled by a Plasmon Thin-Film Waveguide Probe
| Autor: | Xiang Wang, Maofeng Cao, Kaifeng Zhang, Kambayashi Takuya, Taniguchi Shinichi, Kei Kobayashi, Toshihiro Okamoto, Hirofumi Yamada, Yi-Fan Bao, Takehiro Tachizaki, Masanobu Haraguchi, Bin Ren, Masahiro Watanabe |
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| Rok vydání: | 2021 |
| Předmět: |
business.industry
Chemistry 010401 analytical chemistry Substrate (electronics) 010402 general chemistry Laser 01 natural sciences Signal Surface plasmon polariton 0104 chemical sciences Analytical Chemistry law.invention symbols.namesake law symbols Optoelectronics Thin film business Raman spectroscopy Waveguide Plasmon |
| Zdroj: | Analytical chemistry. 93(21) |
| ISSN: | 1520-6882 |
| Popis: | Tip-enhanced Raman spectroscopy (TERS) is a nano-optical approach to extract spatially resolved chemical information with nanometer precision. However, in the case of direct-illumination TERS, which is often employed in commercial TERS instruments, strong fluorescence or far-field Raman signals from the illuminated areas may be excited as a background. They may overwhelm the near-field TERS signal and dramatically decrease the near-field to far-field signal contrast of TERS spectra. It is still challenging for TERS to study the surface of fluorescent materials or a bulk sample that cannot be placed on an Au/Ag substrate. In this study, we developed an indirect-illumination TERS probe that allows a laser to be focused on a flat interface of a thin-film waveguide located far away from the region generating the TERS signal. Surface plasmon polaritons are generated stably on the waveguide and eventually accumulated at the tip apex, thereby producing a spatially and energetically confined hotspot to ensure stable and high-resolution TERS measurements with a low background. With this thin-film waveguide probe, TERS spectra with obvious contrast from a diamond plate can be acquired. Furthermore, the TERS technique based on this probe exhibits excellent TERS signal stability, a long lifetime, and good spatial resolution. This technique is expected to have commercial potential and enable further popularization and development of TERS technology as a powerful analytical method. |
| Databáze: | OpenAIRE |
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