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Exploiting plasmons in 2D metals for refractive index sensing: Simulation study.
- Source :
- Journal of Applied Physics; 12/14/2022, Vol. 132 Issue 22, p1-8, 8p
- Publication Year :
- 2022
-
Abstract
- Ultrathin and two-dimensional (2D) metals can support strong plasmons, with concomitant tight field confinement and large field enhancement. Accordingly, 2D-metal nanostructures exhibiting plasmonic resonances are highly sensitive to the environment and intrinsically suitable for optical sensing. Here, based on a proof-of-concept numerical study, nano-engineered ultrathin 2D-metal films that support infrared plasmons are demonstrated to enable highly responsive refractive index (RI) sensing. For 3 nm-Au nanoribbons exhibiting plasmonic resonances at wavelengths around 1600 nm, a RI sensitivity of S<subscript>RI</subscript> > 650 nm per refractive index unit (RIU) is observed for a 100 nm-thick analyte layer. A parametric study of the 2D-Au system indicates the strong dependence of the RI sensitivity on the 2D-metal thickness. Furthermore, for an analyte layer as thin as 1 nm, a RI sensitivity up to 110 (90 nm/RIU) is observed in atomically thin 2D-In (2D-Ga) nanoribbons exhibiting highly localized plasmonic resonances at mid-infrared wavelengths. Our results not only reveal the extraordinary sensing characteristics of 2D-metal systems but also provide insight into the development of 2D-metal-based plasmonic devices for enhanced IR detection. [ABSTRACT FROM AUTHOR]
- Subjects :
- REFRACTIVE index
THIN films
PLASMONICS
METALS
NANORIBBONS
METALLIC films
SENSES
Subjects
Details
- Language :
- English
- ISSN :
- 00218979
- Volume :
- 132
- Issue :
- 22
- Database :
- Complementary Index
- Journal :
- Journal of Applied Physics
- Publication Type :
- Academic Journal
- Accession number :
- 160822683
- Full Text :
- https://doi.org/10.1063/5.0123648