Ultrasensitive detection and characterization of molecules with infrared plasmonic metamaterials View Full Text


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Article Info

DATE

2015-11

AUTHORS

Fei Cheng, Xiaodong Yang, Jie Gao

ABSTRACT

Infrared vibrational spectroscopy is an effective technique which enables the direct probe of molecular fingerprints, and such detection can be further enhanced by the emerging engineered plasmonic metamaterials. Here we experimentally demonstrate ultrasensitive detection and characterization of polymer molecules based on an asymmetric infrared plasmonic metamaterial, and quantitatively analyze the molecule detection sensitivity and molecule-structure interactions. A sharp, non-radiative Fano resonance supported by the plasmonic metamaterial exhibits strongly enhanced near-field, and the resonance frequency is tailored to match the vibrational fingerprint of the target molecule. By utilizing the near-field nature of the plasmonic excitation, significantly enhanced absorption signal of molecules in the infrared spectroscopy are obtained, enabling ultrasensitive detection of only minute quantities of organic molecules. The enhancement of molecular absorption up to 10(5) fold is obtained, and sensitive detection of molecules at zeptomole levels (corresponding to a few tens of molecules within a unit cell) is achieved with high signal-to-noise ratio in our experiment. The demonstrated infrared plasmonic metamaterial sensing platform offers great potential for improving the specificity and sensitivity of label-free, biochemical detection. More... »

PAGES

14327

Identifiers

URI

http://scigraph.springernature.com/pub.10.1038/srep14327

DOI

http://dx.doi.org/10.1038/srep14327

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1042587611

PUBMED

https://www.ncbi.nlm.nih.gov/pubmed/26388404


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Turtle is a human-readable linked data format.

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RDF/XML is a standard XML format for linked data.

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