| Authors | Esmat Jafari, Mohammad Ali Mansouri-Birjandi, Alireza Tavousi |
|---|---|
| Journal | Materials Science and Engineering: B |
| Paper Type | Full Paper |
| Published At | 2024 |
| Journal Grade | ISI |
| Journal Type | Typographic |
| Journal Country | Iran, Islamic Republic Of |
Abstract
This report demonstrates a subwavelength plasmonic metasurface for a refractive index sensor at near-infrared (NIR) wavelengths. This sensor includes a two-dimensional periodic array of gold nano-rings and nano-holes in a gold film. The structure's potential for high-sensitivity sensing in reflection configuration has been demonstrated. We use a TiN layer in this structure. It prevents light transmission from the resonators, making the transmission spectrum near zero and causing a deeper reflection dip. This sensor can be suitable for biosensing applications like poliovirus sensing. Generally, high sensitivity is obtained for poliovirus of over 817 nm/RIU. It is shown that making ledges around nano-holes increases the resonance wavelength shift and, therefore, the sensitivity by more than 33 times.