Open AccessEffective-zero-thickness terahertz slot antennas using stepped structures
Author(s) -
Hyeong Seok Yun,
Dukhyung Lee,
DaiSik Kim
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.427061
Subject(s) - terahertz radiation , materials science , fabrication , optics , optoelectronics , electromagnetic radiation , near and far field , transmission (telecommunications) , terahertz spectroscopy and technology , electromagnetic field , nanostructure , physics , nanotechnology , computer science , telecommunications , medicine , alternative medicine , pathology , quantum mechanics
Metallic nanostructures play an essential role in electromagnetic manipulations due to the localization and enhancement of electromagnetic waves in nanogaps. Scaling down the dimensions of the gap, such as the gap width and the thickness, is an effective way to enhance light-matter interaction with colossal field enhancement. However, reducing the thickness below 10 nanometers still suffers from fabrication difficulty and unintended direct transmission through metals. Here, we fabricate effective-zero-thickness slot antennas by stepping metals in the vicinity of the gaps to confine electromagnetic waves in tiny volumes. We analyze and simulate terahertz transmission, and demonstrate the absorption enhancement of molecules in the slot antennas. Our fabrication technique provides a simple but versatile tool for maximum field enhancement and molecular sensing.