Abstract

Plasmonic nanostructures have played a crucial role in surface-enhanced infrared absorption (SEIRA) for its direct (far-field) inspection of an extremely small amount of molecule [1]. Recent efforts to reach atto/zeptomole sensitivity of SEIRA have focused on hot-spot engineering to improve the near-field enhancement and its spatial and spectral mode overlapping between the plasmons and molecular vibrations [2]. Plasmonic metamaterials, on the other hand, have introduced new degree of freedom to manipulate optical field from nano to macroscopic scale, where not only near-field enhancement, but also far-field spectral responses can be engineered, thus offering an attractive platform for sensing applications.

© 2016 Japan Society of Applied Physics, Optical Society of America