Surface-enhanced terahertz spectroscopy using gold rod structures resonant with terahertz waves

Hiroaki Misawa, Nozawa Sho, Ueno Kosei

    研究成果: Article同行評審

    14 引文 斯高帕斯(Scopus)

    摘要

    Terahertz (THz) spectroscopy is a promising method to measure the spectrum of low-frequency modes of molecules or ensembles, such as crystals and polymers, including proteins. However, the main drawback of THz spectroscopy is its extremely low sensitivity. In the present study, we report on signal enhancement in THz spectroscopy achieved by depositing amino acid molecules or their derivatives on a gold rod structured silicon substrate whose localized surface plasmon resonance is exhibited in the THz frequency region. The distinct peaks derived from the enhancement of the inherent spectrum based on a molecular crystal were clearly observed when a longitudinal plasmon resonance mode of the gold rod structure was excited and the plasmon resonance band overlapped the molecular/intermolecular vibrational mode. We discuss the mechanism by which surface-enhanced THz spectroscopy was induced from the viewpoint of the enhancement of light-matter coupling due to plasmon excitation and the modulation of the plasmon band by dipole coupling between the plasmon dipole and molecular/intermolecular vibrational modes. (C) 2015 Optical Society of America
    原文English
    頁(從 - 到)28584-28592
    頁數9
    期刊Optics Express
    23
    發行號22
    DOIs
    出版狀態Published - 2 十一月 2015

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