| Asymmetric split ring resonators for optical sensing of organic materials. | |
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MedLine Citation:
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PMID: 19158928 Owner: NLM Status: PubMed-not-MEDLINE |
Abstract/OtherAbstract:
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Asymmetric Split Ring Resonators are known to exhibit resonant modes where the optical electric field is strongest near the ends of the arms, thereby increasing the sensitivity of spectral techniques such as surface enhanced Raman scattering (SERS). By producing asymmetry in the structures, the two arms of the ring produce distinct plasmonic resonances related to their lengths - but are also affected by the presence of the other arm. This combination leads to a steepening of the slope of the reflection spectrum between the resonances that increases the sensitivity of the resonant behavior to the addition of different molecular species. We describe experimental results, supported by simulation, on the resonances of a series of circular split ring resonators with different gap and section lengths--at wavelengths in the mid-infra red regions of the spectrum--and their utilization for highly sensitive detection of organic compounds. We have used thin films of PMMA with different thicknesses, resulting in characteristic shifts from the original resonance. We also demonstrate matching of asymmetric split ring resonators to a molecular resonance of PMMA. |
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Authors:
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Basudev Lahiri; Ali Z Khokhar; Richard M De La Rue; Scott G McMeekin; Nigel P Johnson |
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Publication Detail:
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Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Optics express Volume: 17 ISSN: 1094-4087 ISO Abbreviation: Opt Express Publication Date: 2009 Jan |
Date Detail:
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Created Date: 2009-01-22 Completed Date: 2009-06-25 Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101137103 Medline TA: Opt Express Country: United States |
Other Details:
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Languages: eng Pagination: 1107-15 Citation Subset: - |
Affiliation:
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Department of Electronics and Electrical Engineering, University of Glasgow, Glasgow, G12 8LT, UK. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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