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A plasmonic 'ac Wheatstone bridge' circuit for high-sensitivity phase measurement and single-molecule detection

Davis, Tim, Vernon, Kristy, & Gomez, Daniel (2009) A plasmonic 'ac Wheatstone bridge' circuit for high-sensitivity phase measurement and single-molecule detection. Journal of Applied Physics, 106(4), pp. 1-6.

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Abstract

In this paper, a plasmonic “ac Wheatstone bridge” circuit is proposed and theoretically modeled for the first time. The bridge circuit consists of three metallic nanoparticles, shaped as rectangular prisms, with two nanoparticles acting as parallel arms of a resonant circuit and the third bridging nanoparticle acting as an optical antenna providing an output signal. Polarized light excites localized surface plasmon resonances in the two arms of the circuit, which generate an optical signal dependent on the phase-sensitive excitations of surface plasmons in the antenna. The circuit is analyzed using a plasmonic coupling theory and numerical simulations. The analyses show that the plasmonic circuit is sensitive to phase shifts between the arms of the bridge and has the potential to detect the presence of single molecules.

Impact and interest:

9 citations in Scopus
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9 citations in Web of Science®

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13 since deposited on 24 Aug 2011
13 in the past twelve months

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ID Code: 44701
Item Type: Journal Article
DOI: 10.1063/1.3195071
ISSN: 0021-8979
Subjects: Australian and New Zealand Standard Research Classification > MATHEMATICAL SCIENCES (010000)
Australian and New Zealand Standard Research Classification > PHYSICAL SCIENCES (020000)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000)
Copyright Owner: Copyright 2009 American Institute of Physics
Deposited On: 25 Aug 2011 08:13
Last Modified: 27 Mar 2014 14:29

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