Surface-Enhanced Infrared Spectroscopy Using Nanometer-Sized Gaps
Abstract
We report on the near-field coupling of individual gold nanoantennas arranged in tip-to-tip dimer configuration, leading to strong electromagnetic field enhancements in the infrared, which is of great interest for sensing applications such as surface-enhanced infrared spectroscopy. We quantitatively evaluated the enhancement of vibrational excitations of a 5 nm thick test layer of 4,4′-bis(N-carbazolyl)-1,1′-biphenyl as a function of different gap sizes. The dimers with the smallest gaps under investigation (∼3 nm) lead to more than 1 order of magnitude higher signal enhancement with respect to gaps of 50 nm width. The comparison of experimental data and finite-difference time-domain simulations reveals a nonperfect filling of the gaps with sizes below 10 nm, which means that morphological information on the nanoscale is obtained additionally to chemical information.
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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 [29]
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Nanogapped Au Antennas for Ultrasensitive Surface-Enhanced Infrared Absorption Spectroscopy
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- Authors
- Huck, C., Neubrech, F., Vogt, J., Toma, A., Gerbert, D., Katzmann, J., Härtling, T., & Pucci, A.
- Affiliations
- Heidelberg University (DE)
- University of Stuttgart (DE)
- Istituto Italiano di Tecnologia , Via Morego 30, ,
- Fraunhofer Institute for Ceramic Technologies and Systems (DE)
- Fraunhofer Institute for Ceramic Technologies and Systems, Materials Diagnostics , Maria-Reiche-Str. 2, ,
- Corresponding author
- Pucci, Annemarie
- Venue
- ACS Nano
- Publisher
- American Chemical Society (ACS)
- Published
- 2014-04-11
- Volume
- 8
- Issue
- 5
- Pages
- 4908-4914
- ISSN
- 1936-0851 (ISSN-L)
- 1936-086X
- OpenAlex
- W2318240307
- Cited by
- 225
- References
- 40
- Citations by year
- 2026: 8 · 2025: 12 · 2024: 13 · 2023: 12 · 2022: 16 · 2021: 15 · 2020: 16 · 2019: 19 · 2018: 29 · 2017: 32 · 2016: 18 · 2015: 30 · 2014: 5
- FWCI
- 14.72
- Type
- journal article
- Language
- en
- Open access
- closed
- Licence
- Locations
- ACS Nano (publishedVersion)
- PubMed (publishedVersion)
- Fraunhofer-Publica (Fraunhofer-Gesellschaft) (submittedVersion)
- 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 › Engineering › Biomedical Engineering › Near-Field Optical Microscopy
- Keywords
- surface-enhanced infrared absorption, gold nanoantennas, near-field coupling, electromagnetic field enhancement, vibrational excitation, finite-difference time-domain simulation, gap filling, nanoscale morphology
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