Spectral modulation of molecular/intermolecular vibrational mode by infrared plasmon

摘要

Terahertz (THz) spectroscopy is a promising way 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 spoof surface plasmon resonance is exhibited in the THz frequency region.