Beyond-hot-spot absorption enhancement on top of terahertz nanotrenches.

ABSTRACT: Metallic nanogaps are being widely used for sensing applications, owing to their ability to confine and enhance electromagnetic field within the hot spots. Since the enhanced field does not confine itself perfectly within the gap, however, fringe fields well away from the gap are of potential use as well in real systems. Here, we extend the concept of near field absorption enhancement by quantitatively analyzing terahertz absorption behavior of water molecules outside the hot spots of sub-20 nm-wide, ∼100 μm-long nanotrenches. Contrary to point-gaps which show negligible field enhancement at distances larger than the gap width, our extended nanogap act as a line source, incorporating significant amount of absorption enhancement at much longer distances. We observe absorption enhancement fa

SUBMITTER: Jeong J 

PROVIDER: S-EPMC11501868 | biostudies-literature | 2022 Jun

REPOSITORIES: biostudies-literature