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      Sensitivity comparison of localized plasmon resonance structures and prism coupler

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      Author(s)
      Kaya, Y.
      Ayas S.
      Topal, A. E.
      Guner, H.
      Dana, A.
      Date
      2014
      Source Title
      Sensors and Actuators B: Chemical
      Print ISSN
      0925-4005
      Volume
      191
      Pages
      516 - 521
      Language
      English
      Type
      Article
      Item Usage Stats
      172
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      Abstract
      Plasmon resonances are widely used in biomolecular sensing and continue to be an active research field due to the rich variety of surface and measurement configurations, some of which exhibit down to single molecule level sensitivity. The resonance wavelength shift of the plasmonic structure upon binding of molecules, strongly depends, among other parameters, on how well the field of the resonant mode is confined to the binding site. Here it is shown that, by using properly designed metal-insulator-metal type resonators, improved wavelength response can be achieved with localized surface plasmon resonators (LSPRs) compared to that of the commonly used Kretschmann geometry. Using computational tools we investigate theoretically the refractive index response of several LSPR structures to a 2 nm thin film of binding molecules. LSPR resonators are shown to feature improved sensitivity over conventional Kretschmann geometry in the wavelength interrogation scheme for such a thin film. Moreover, some of the LSPR modes are quasi-omnidirectional and such angular independence (up to 30 angle of incidence) allows higher numerical apertures to be used in colorimetric imaging. Results highlight the potential of LSPRs for biomolecular sensing with high sensitivity and high spatial resolution.
      Keywords
      Biomolecular sensing
      Localized plasmon resonance sensors
      Surface plasmon resonance
      Biomolecular sensing
      High spatial resolution
      Localized plasmon resonance
      Localized surface plasmon
      Measurement configuration
      Metal insulator metals
      Resonance wavelengths
      Wavelength interrogation
      Metal insulator boundaries
      Molecules
      Plasmons
      Refractive index
      Resonators
      Thin films
      Surface plasmon resonance
      Permalink
      http://hdl.handle.net/11693/26632
      Published Version (Please cite this version)
      http://dx.doi.org/10.1016/j.snb.2013.09.098
      Collections
      • Department of Electrical and Electronics Engineering 4016
      • Institute of Materials Science and Nanotechnology (UNAM) 2258
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