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https://doi.org/10.1021/nn304860t
Title: | Ultrasensitive broadband probing of molecular vibrational modes with multifrequency optical antennas | Authors: | Aouani, H. Šípová, H. Rahmani, M. Navarro-Cia, M. Hegnerová, K. Homola, J. Hong, M. Maier, S.A. |
Keywords: | broadband optical antenna field enhancement nanoantenna plasmonic SEIRA vibrational spectroscopy |
Issue Date: | 22-Jan-2013 | Citation: | Aouani, H., Šípová, H., Rahmani, M., Navarro-Cia, M., Hegnerová, K., Homola, J., Hong, M., Maier, S.A. (2013-01-22). Ultrasensitive broadband probing of molecular vibrational modes with multifrequency optical antennas. ACS Nano 7 (1) : 669-675. ScholarBank@NUS Repository. https://doi.org/10.1021/nn304860t | Abstract: | Optical antennas represent an enabling technology for enhancing the detection of molecular vibrational signatures at low concentrations and probing the chemical composition of a sample in order to identify target molecules. However, efficiently detecting different vibrational modes to determine the presence (or the absence) of a molecular species requires a multispectral interrogation in a window of several micrometers, as many molecules present informative fingerprint spectra in the mid-infrared between 2.5 and 10 μm. As most nanoantennas exhibit a narrow-band response because of their dipolar nature, they are not suitable for such applications. Here, we propose the use of multifrequency optical antennas designed for operating with a bandwidth of several octaves. We demonstrate that surface-enhanced infrared absorption gains in the order of 105 can be easily obtained in a spectral window of 3 μm with attomolar concentrations of molecules, providing new opportunities for ultrasensitive broadband detection of molecular species via vibrational spectroscopy techniques. © 2012 American Chemical Society. | Source Title: | ACS Nano | URI: | http://scholarbank.nus.edu.sg/handle/10635/83242 | ISSN: | 19360851 | DOI: | 10.1021/nn304860t |
Appears in Collections: | Staff Publications |
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