Document Detail


Ultra-Sensitive Broadband Probing of Molecular Vibrational Modes with Multifrequency Optical Antennas.
MedLine Citation:
PMID:  23199257     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
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 microns, as many molecules present informative fingerprint spectra in the mid-infrared between 2.5 and 10 microns. 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 microns with attomolar concentrations of molecules, providing new opportunities for ultra-sensitive broadband detection of molecular species via vibrational spectroscopy techniques.
Authors:
Heykel Aouani; Hana Sipova; Mohsen Rahmani; Miguel Navarro-Cia; Katerina Hegnerova; Jiri Homola; Minghui Hong; Stefan A Maier
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-12-2
Journal Detail:
Title:  ACS nano     Volume:  -     ISSN:  1936-086X     ISO Abbreviation:  ACS Nano     Publication Date:  2012 Dec 
Date Detail:
Created Date:  2012-12-3     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101313589     Medline TA:  ACS Nano     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
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