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Dual-band in situ molecular spectroscopy using single-sized Al-disk perfect absorbers

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Title: Dual-band in situ molecular spectroscopy using single-sized Al-disk perfect absorbers
Authors: Dao, Thang Duy Browse this author
Chen, Kai Browse this author
Nagao, Tadaaki Browse this author →KAKEN DB
Issue Date: 21-May-2019
Publisher: Royal Society of Chemistry
Journal Title: Nanoscale
Volume: 11
Issue: 19
Start Page: 9508
End Page: 9517
Publisher DOI: 10.1039/c9nr00904c
Abstract: We propose antenna-enhanced infrared vibrational spectroscopy by adopting single-sized Al disks on Al2O3-Al films fabricated by colloidal-mask lithography. The precisely designed plasmonic resonator with dual-band perfect absorption (DPA) shows strongly-enhanced nearfield intensity and polarization independence, at both resonances, providing a powerful antenna platform for the multi-band vibrational sensing. As a proof of concept, we experimentally apply the plasmonic DPAs in bond-selective dual-band infrared sensing of an ultrathin polydimethylsiloxane (PDMS) film, simultaneously amplifying two representative vibrational bands (asymmetric C-H stretching of CH3 at 2962 cm(-1) and CH3 deformation of Si-CH3 at 1263 cm(-1)) by surface-enhanced infrared absorption spectroscopy (SEIRA). The plasmonic DPA was successfully adopted for the in situ monitoring of reaction kinetics, by recording the spectral changes in C-H stretching and Si-CH3 deformation modes of a 10 nm PDMS elastomer, which are selectively enhanced by the two antenna resonances, during its gelation process. Our systematic study of the SEIRA spectra has demonstrated mode splitting and a clear avoided-crossing in the dispersion curve as a function of resonance frequency of DPA, manifesting itself as a promising basis for future polaritonic devices utilizing the hybridization between the molecular vibrational states and the enhanced light field.
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 長尾 忠昭

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