High sensitivity infrared gas sensing and filtering using metasurfaces plasmonic ring resonators
7 affiliations
- 1Laboratory of Materials, Waves, Energy and Environment, Team of Waves, Acoustics, Photonics and Materials, Mohamed I University, Oujda, Morocco
- 2Deanship of Scientific Research, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia
- 3Department of Mathematics and Statistics, College of Science, Imam Mohammad Ibn Saud Islamic University (IMSIU), Riyadh, Saudi Arabia
- 4Engineering Sciences Laboratory (LSI), Multidisciplinary Faculty of Taza, Sidi Mohamed Ben Abdellah University, Taza Gare, Morocco
- 5Department of Physics, Al-Qunfudah University College, Umm Al-Qura University, Makkah, Saudi Arabia
- 6Physics Department, Faculty of Science, Beni-Suef University, Beni Suef, Egypt
- 7Department of Mathematics and Natural Sciences, Gulf University for Science and Technology, Mishref, Kuwait
Abstract
This work investigates a plasmonic metal–insulator–metal (MIM) ring structure periodically coupled to dual resonators and a defect cell, engineered for infrared filtering and gas sensing. The optical response is modeled numerically using the finite element method in COMSOL Multiphysics, enabling accurate analysis of strong field confinement and loss in the subwavelength MIM geometry. By tuning the geometrical parameters of the rectangular and lateral resonators and of the defect cavity, we show that the transmission spectrum, band-gap position, and defect resonance wavelength can be precisely controlled, and that introducing a defect resonator into a periodic dual-resonator array generates a sharp, highly localized mode inside the plasmonic band gap. Small variations of the refractive index in the gas-filled device lead to clear, nearly linear shifts of this defect resonance, yielding a high sensitivity of about 1920 nm/RIU together with a Q-factor above 100 and a low detection limit, so that sensitivity, spectral selectivity, and detection capability are simultaneously enhanced. These results highlight the novelty of combining periodic band-gap engineering, dual-resonator coupling, and defect optimization in a single MIM platform, and demonstrate that the proposed structure can function as both a narrowband photonic filter and a high-performance infrared gas sensor in a compact, integrated configuration.
Related
- Sliding metasurfaces: a two-in-one meta-device for frequency filtering and beam steering
- Ultrafast dual-band all-optical logic gate design using CMOS compatible alternative plasmonic materials with IMI geometry and nanoring resonators
- Finding a small cytokine inside complex biological matrices using nanobody-functionalized plasmonic metasurfaces
- Ge ₂ Sb ₂ Te ₅ -enabled nonvolatile switching of symmetry-engineered chiral q-BIC states in mid-infrared metasurfaces
- Near-Unity and Narrowband Light Absorption in Mid-Infrared α-MoO3-Based Metasurfaces
BibTeX
@article{mimoun2026high,
title = {{High sensitivity infrared gas sensing and filtering using metasurfaces plasmonic ring resonators}},
author = {El-Aouni Mimoun and Ali Hennache and Mahmoud A. Zaky and Ben-Ali Youssef and Essahlaoui Abdelouahed and Bria Driss and Ali Alzahrani and Zaky A. Zaky},
journal = {PLOS One},
year = {2026},
month = oct,
doi = {10.1371/journal.pone.0353973},
url = {https://doi.org/10.1371/journal.pone.0353973},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - High sensitivity infrared gas sensing and filtering using metasurfaces plasmonic ring resonators
AU - El-Aouni Mimoun
AU - Ali Hennache
AU - Mahmoud A. Zaky
AU - Ben-Ali Youssef
AU - Essahlaoui Abdelouahed
AU - Bria Driss
AU - Ali Alzahrani
AU - Zaky A. Zaky
PY - 2026
DA - 2026/10/27
JO - PLOS One
DO - 10.1371/journal.pone.0353973
UR - https://doi.org/10.1371/journal.pone.0353973
AB - This work investigates a plasmonic metal–insulator–metal (MIM) ring structure periodically coupled to dual resonators and a defect cell, engineered for infrared filtering and gas sensing. The optical response is modeled numerically using the finite element method in COMSOL Multiphysics, enabling accurate analysis of strong field confinement and loss in the subwavelength MIM geometry. By tuning the geometrical parameters of the rectangular and lateral resonators and of the defect cavity, we show that the transmission spectrum, band-gap position, and defect resonance wavelength can be precisely controlled, and that introducing a defect resonator into a periodic dual-resonator array generates a sharp, highly localized mode inside the plasmonic band gap. Small variations of the refractive index in the gas-filled device lead to clear, nearly linear shifts of this defect resonance, yielding a high sensitivity of about 1920 nm/RIU together with a Q-factor above 100 and a low detection limit, so that sensitivity, spectral selectivity, and detection capability are simultaneously enhanced. These results highlight the novelty of combining periodic band-gap engineering, dual-resonator coupling, and defect optimization in a single MIM platform, and demonstrate that the proposed structure can function as both a narrowband photonic filter and a high-performance infrared gas sensor in a compact, integrated configuration.
SN - 1932-6203
ER -