Open AccessEnhancement of refractive index sensing for an infrared plasmonic metamaterial absorber with a nanogap
Author(s) -
Jae Hee Jung,
Jihye Lee,
Jun-Hyuk Choi,
DaeGeun Choi,
JunHo Jeong
Publication year - 2021
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.432392
Subject(s) - materials science , metamaterial , refractive index , figure of merit , plasmon , nanoimprint lithography , optics , optoelectronics , metamaterial absorber , high refractive index polymer , absorption (acoustics) , fabrication , tunable metamaterials , medicine , alternative medicine , physics , pathology , composite material
An infrared plasmonic metamaterial absorber with a nanogap was numerically and experimentally investigated as a refractive index sensor. We experimentally demonstrated large enhancements of both sensitivity (approximately 1091 nm/refractive index unit) and figure of merit (FOM*; approximately 273) owing to the nanogap formation in the metamaterial absorber to achieve perfect absorption (99%). The refractive index sensing platform was fabricated by producible nanoimprint lithography and isotropic dry etching processes to have a large area and low cost while providing a practical solution for high-performance plasmonic biosensors.