2010
DOI: 10.1021/nl101165r
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Using the Angle-Dependent Resonances of Molded Plasmonic Crystals To Improve the Sensitivities of Biosensors

Abstract: This paper describes how angle-dependent resonances from molded plasmonic crystals can be used to improve real-time biosensing. First, an inexpensive and massively parallel approach to create single-use, two-dimensional metal nanopyramidal gratings was developed. Second, although constant in bulk dielectric environments, the sensitivities (resonance wavelength shift and resonance width) of plasmonic crystals to adsorbed molecular layers of varying thickness were found to depend on incident excitation angle. Th… Show more

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Cited by 77 publications
(71 citation statements)
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“…The degeneracy of plasmonic modes occurring at non-zero incident angles 16,43,44 can be further controlled by the azimuthal rotation of the nanohole arrays. By rotating the crystal azimuthally, we observed a broadband resonance of 150 nm bandwidth at 4 from the plasmonic crystal, which was in excellent agreement with the predictions (Fig.…”
Section: Resultsmentioning
confidence: 99%
“…The degeneracy of plasmonic modes occurring at non-zero incident angles 16,43,44 can be further controlled by the azimuthal rotation of the nanohole arrays. By rotating the crystal azimuthally, we observed a broadband resonance of 150 nm bandwidth at 4 from the plasmonic crystal, which was in excellent agreement with the predictions (Fig.…”
Section: Resultsmentioning
confidence: 99%
“…Nanoscale apertures in metallic films are the most commonly used structures to spectroscopically study membranes, however, metal nanoparticles, 22 spherical micro-resonators, 2 and conventional surface plasmon spectroscopy (SPR) have also been employed for label-free detection of biomolecules (un)binding to the metal or associated membranes. High-sensitivity plasmonic devices can be created with inexpensive colloidal lithography 10 or precisely nanostructured surfaces for greater capabilities, 23 and through-aperture microfluidics. 43 …”
Section: Surface Plasmons For Optical Enhancementmentioning
confidence: 99%
“…These applications are dependent on the sensitivity of surface plasmon polaritons (SPPs) to the refractive index (RI) of the medium adjacent to the metal surface. 3,4,13,18 Among the various types, grating structure can be compact and robust, which are desirable characteristics for integration into other devices 6 apart from the tunability of the spectral response through geometrical parameters. [10][11][12][19][20][21] Especially, 1D grating can support waveguide, propagating SPPs and/or surface wave modes.…”
Section: Introductionmentioning
confidence: 99%
“…The asymmetric grating depicts minima in the reflection spectrum corresponding to the SPPs due to the interaction between longitudinal and transverse resonant modes. 10,19,23 The applications of gratings are not limited to the detection of RI, 5,[10][11][12][13]18 but extends to the estimation of analyte height (h) 10,24 where the latter is quite interesting, and the least explored as far as we can ascertain. In the context of detection of h, the spectral shift of surface wave resonance can be quantified, similar to that of RI.…”
Section: Introductionmentioning
confidence: 99%