Plasmon-Enhanced Infrared Spectroscopy Based on Metamaterial Absorbers with Dielectric Nanopedestals
Abstract
In this study, we introduce a sensing platform based on plasmonic metamaterial absorbers (MAs) with dielectric nanopedestals for the ultrasensitive detection of monolayer biomolecules. MAs with nanopedestals, which allow access to extremely high near-field intensities forming on the top and bottom of nanoantennas that further enhance molecular sensing signals, consist of cross-shaped gold (Au) nanoantennas on dielectric nanopedestals and an Au layer as a mirror layer. The sensing characteristics of the MAs with nanopedestals are compared with control MAs using an unetched dielectric spacer. To provide strong coupling between the molecular vibrations of the target 1-octacanethiol (ODT) molecules and plasmonic resonance from the MAs, the dimensions of the cross-antennas are properly designed and the MAs fabricated by using nanoimprint lithography. Temporal coupled-mode theory is used to analyze the experimentally measured absorption spectra containing the enhanced vibrational signatures of molecules of the ODT monolayer. Based on MAs with nanopedestals, the molecular sensing signal is enhanced over four times compared with that of the control MAs. The proposed structure based on MAs with nanopedestals may provide a promising sensing platform for future applications of ultrasensitive biological and chemical sensing and detection.
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Molecular enrichment strategies bring additional working requirements for specific molecules, impeding global molecular recognition.
“The molecular enrichment strategies, including functionalized chemical bonding17,18, chemical reaction19,20, physical adsorption21–23, optical trapping24 as well as passive trapping by undercut structure25–28 bring in the additional working requirements (e.g., chemical stimuli, temperature, pressure, pump power, etc.) for specific molecules, impeding the system for global molecular recognition.”
From Wavelength-multiplexed hook nanoantennas for machine learning enabled mid-infrared spectroscopy (2022) · cites this paper as [26]
Three approaches to optimize nanoantenna sensing by increasing coupling efficiency μ are hotspot release, molecule enrichment, and squeezing adjacent nanoantennas into a nanogap.
“Figure 2b summarizes three approaches to optimize nanoantenna sensing by increasing μ. Hotspots release is proposed to increase accessible sensing areas for analytes, which are usually blocked by the substrate, to further enhance the coupling efficiency25–28.”
From Wavelength-multiplexed hook nanoantennas for machine learning enabled mid-infrared spectroscopy (2022) · cites this paper as [26]
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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
- Hwang, I., Yu, J., Lee, J., Choi, J.-H., Choi, D.-G., Jeon, S., Lee, J., & Jung, J.-Y.
- Affiliations
- Ulsan National Institute of Science and Technology (KR)
- Korea Institute of Machinery & Materials (KR)
- Corresponding author
- Lee, Jongwon
- Jung, Joo-Yun
- Venue
- ACS Photonics
- Publisher
- American Chemical Society (ACS)
- Published
- 2018-08-20
- Volume
- 5
- Issue
- 9
- Pages
- 3492-3498
- ISSN
- 2330-4022 (ISSN-L)
- OpenAlex
- W2888573981
- Cited by
- 63
- References
- 38
- Citations by year
- 2026: 5 · 2025: 10 · 2024: 5 · 2023: 8 · 2022: 10 · 2021: 7 · 2020: 8 · 2019: 10
- FWCI
- 2.50
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- ACS Photonics (publishedVersion)
- Scholarworks@UNIST (Ulsan National Institute of Science and Technology) (submittedVersion)
- Funders
- Ulsan National Institute of Science and Technology (1.150141.01)
- Korea Institute of Machinery and Materials (NK 211D)
- National Research Foundation of Korea (2016R1C1B2009604)
- Ministry of Science, ICT and Future Planning (2014M3A6B3063707)
- 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
- plasmonic metamaterial absorber, infrared plasmonics, gold nanoantennas, molecular detection, temporal coupled-mode theory, nanoimprint lithography, near-field enhancement, ultrasensitive detection
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