Surface-enhanced infrared spectroscopy using nanometer-sized gaps
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...
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| Main Authors: | , , , , , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
April 11, 2014
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| In: |
ACS nano
Year: 2014, Volume: 8, Issue: 5, Pages: 4908-4914 |
| ISSN: | 1936-086X |
| DOI: | 10.1021/nn500903v |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1021/nn500903v
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| Author Notes: | Christian Huck, Frank Neubrech, Jochen Vogt, Andrea Toma, David Gerbert, Julia Katzmann, Thomas Härtling, and Annemarie Pucci |
| Summary: | 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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| Item Description: | Gesehen am 01.09.2020 |
| Physical Description: | Online Resource |
| ISSN: | 1936-086X |
| DOI: | 10.1021/nn500903v |