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Dual-band in situ molecular spectroscopy using single-sized Al-disk perfect absorbers
| 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) |
| URI: | http://hdl.handle.net/2115/77459 |
| 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)
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Submitter: 長尾 忠昭
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