Resonant Coupling between Molecular Vibrations and Localized Surface Plasmon Resonance of Faceted Metal Oxide Nanocrystals

• DOI: 10.1021/acs.nanolett.7b00404
• Publication Date: 2017-03-25T12:58:13Z
• Authors: Ankit Agrawal; Ajay Singh; Sadegh Yazdi; Amita Singh; Gary K. Ong; Karen Bustillo; Robert W. Johns; Emilie Ringe; Delia J. Milliron
• Keywords: Localized surface plasmon; Fano resonance

Doped metal oxides are plasmonic materials that boast both synthetic and postsynthetic spectral tunability. They have already enabled promising smart window optoelectronic technologies been proposed for use in surface enhanced infrared absorption spectroscopy (SEIRA) sensing applications. Herein, we report the first step toward realization of former utilizing cubic F Sn codoped In2O3 nanocrystals (NCs) to couple C-H vibration surface-bound oleate ligands. Electron energy loss is used map strong near-field enhancement around these NCs enables localized plasmon resonance (LSPR) coupling between adjacent LSPR-molecular coupling. Fourier transform measurements finite element simulations applied observe explain nature phenomena, specifically addressing mesoscale assembled films. The Fano line shape signatures LSPR-coupled molecular vibrations rationalized with two-port temporal coupled mode theory. With this combined theoretical experimental approach, describe influence strength relative detuning LSPR on factor further basis observed by deconvoluting response transmission, reflection. This study therefore illustrates various factors involved determining LSPR-LSPR oxide provides a fundamental design or SEIRA substrates.