Ultrasensitive and Selective Gas Sensor Based on a Channel Plasmonic Structure with an Enormous Hot Spot Region
Abstract
We present experimental and theoretical studies of a metamaterial-based plasmonic structure to build a plasmonic–molecular coupling detection system. High molecular sensitivity is realized only when molecules are located in the vicinity of the enhanced field (hot spot region); thus, introducing target molecules in the hot spot region to maximize plasmonic–molecular coupling is crucial to developing the sensing technology. We design a metamaterial consisting of a vertically oriented metal insulator metal (MIM) structure with a 25 nm channel sandwiched between two metal films, which enables the delivery of molecules into the large ravinelike hot spot region, offering an ultrasensitive platform for molecular sensing. This metamaterial is applied to carbon dioxide and butane detection. We design the structure to exhibit resonances at 4033 and 2945 cm –1, which overlap with the C═O and −CH 2 vibration modes, respectively. The mutual coupling of these two resonance modes creates a Fano resonance, and their distinct peaks are clearly observed in the corresponding transmission dips. In addition, owing to its small footprint, such a vertical-oriented MIM structure enables us to increase the integration density and allows the detection of a 20 ppm concentration with negligible background noise and high selectivity in the mid-infrared region.
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Squeezing the gap between adjacent plasmonic nanoantennas to the nanometer scale increases electric field intensity but ruins sensing performance by decreasing active area and increasing fabrication cost.
“The other method to improve the sensitivity is to increase the intensity of the electric field by squeezing the gap between adjacent PNA into the nanometer scale29–31. However, the narrow gap ruins the sensing performance by a decrement in the active area and increases fabrication cost.”
From Wavelength-multiplexed hook nanoantennas for machine learning enabled mid-infrared spectroscopy (2022) · cites this paper as [31]
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Wavelength-multiplexed hook nanoantennas for machine learning enabled mid-infrared spectroscopy
Ren, Z., Zhang, Z., Wei, J., Dong, B., & Lee, C. (2022) · Nature Communications · doi:10.1038/s41467-022-31520-z · Cited by 132 · see citing works
- Authors
- Su, D.-S., Tsai, D. P., Yen, T.-J., & Tanaka, T.
- Affiliations
- National Tsing Hua University (TW)
- National Taiwan University (TW)
- RIKEN (JP)
- Corresponding author
- Yen, Ta-Jen
- Tanaka, Takuo
- Venue
- ACS Sensors
- Publisher
- American Chemical Society (ACS)
- Published
- 2019-10-11
- Volume
- 4
- Issue
- 11
- Pages
- 2900-2907
- ISSN
- 2379-3694 (ISSN-L)
- OpenAlex
- W2980136893
- Cited by
- 39
- References
- 40
- Citations by year
- 2026: 2 · 2025: 7 · 2024: 5 · 2023: 4 · 2022: 7 · 2021: 12 · 2020: 2
- FWCI
- 1.85
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- ACS Sensors (publishedVersion)
- PubMed (publishedVersion)
- Funders
- Ministry of Science and Technology, Taiwan (MOST-107-2221-E- 007-016-MY3, MOST-106-2221-E-007-038-MY3)
- Topics
- Physical Sciences › Engineering › Biomedical Engineering › Plasmonic and Surface Plasmon Research
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Gold and Silver Nanoparticles Synthesis and Applications
- Physical Sciences › Materials Science › Electronic, Optical and Magnetic Materials › Metamaterials and Metasurfaces Applications
- Keywords
- metamaterials, metal-insulator-metal structures, hot spots, Fano resonance, carbon dioxide detection, butane detection, mid-infrared detection, vibrational modes
- MeSH terms
- Butanes, Carbon Dioxide, Gold, Silicon Dioxide, Molecular Structure, Surface Plasmon Resonance, Nanotechnology, Metal Nanoparticles
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