Presentation Information
[19p-A33-15]SEIRA control using of mid-infrared metasurfaces with multiple wavelength resonances
〇(DC)Tang Dang1, Jiaqi Yang1, Yan Ding1, Shuting Ma1, Hitoshi Tabata1, Hiroaki Matsui1 (1.Univ. of Tokyo)
Keywords:
surface-enhanced infrared absorptions,multiple-resonant,metasurface
Mid-infrared (IR) spectroscopy is a powerful tool for identifying molecules through their unique absorption fingerprints, providing detailed information about molecular composition, chemical bonds, and structures. However, IR light absorption is weak due to the size mismatch between IR wavelengths and molecules. Surface-enhanced infrared absorption (SEIRA) spectroscopy has advanced using plasmonic nanostructures and microstructures, which effectively confine IR light and amplify light-matter interactions. By positioning target molecules near these concentrated electric fields, SEIRA significantly boosts molecular vibrational absorptions. This enhancement allows for highly specific and detailed structural information about molecular vibrations to be obtained in a nondestructive manner.
Current SEIRA devices based on plasmonic metasurfaces mainly utilize single nanostructures with a single resonance. However, their narrow resonant bandwidth limits the effective detection of molecular fingerprints for precise identification. For instance, when detecting changes in lipids through methyl absorption, it's challenging to precisely identify whether they involve phospholipids, cholesterol, or fatty acids. In the previous report, we report IR metasurfaces with dual resonances for monitoring biological interactions. This cleared the dynamic analysis of the biological interactions under the molecular recognition. In this presentation, we introduce SEIRA devices with multiple resonances that are placed in the wavenumbers corresponding to the methyl, amide and PO4 related vibrations. In this study, we achieved a metasurface with three distinct resonance peaks using three different sizes of nanocross structures.
Current SEIRA devices based on plasmonic metasurfaces mainly utilize single nanostructures with a single resonance. However, their narrow resonant bandwidth limits the effective detection of molecular fingerprints for precise identification. For instance, when detecting changes in lipids through methyl absorption, it's challenging to precisely identify whether they involve phospholipids, cholesterol, or fatty acids. In the previous report, we report IR metasurfaces with dual resonances for monitoring biological interactions. This cleared the dynamic analysis of the biological interactions under the molecular recognition. In this presentation, we introduce SEIRA devices with multiple resonances that are placed in the wavenumbers corresponding to the methyl, amide and PO4 related vibrations. In this study, we achieved a metasurface with three distinct resonance peaks using three different sizes of nanocross structures.
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