Journal
ACS NANO
Volume 7, Issue 1, Pages 669-675Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn304860t
Keywords
plasmonic; nanoantenna; broadband optical antenna; field enhancement; vibrational spectroscopy; SEIRA
Categories
Funding
- U.S. Army International Technology Centre Atlantic (USAITC-A)
- Office of Naval Research (ONR)
- Office of Naval Research (ONR Global)
- Imperial College Junior Research Fellowship
- Engineering and Physical Sciences Research Council [EP/H000917/2, EP/D063329/1] Funding Source: researchfish
- EPSRC [EP/D063329/1, EP/H000917/2] Funding Source: UKRI
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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 mu m. 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 10(5) can be easily obtained in a spectral window of 3 mu m with attomolar concentrations of molecules, providing new opportunities for ultrasensitive broadband detection of molecular species via vibrational spectroscopy techniques.
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