The Experts below are selected from a list of 271779 Experts worldwide ranked by ideXlab platform
A Kabashin - One of the best experts on this subject based on the ideXlab platform.
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plasmonic nanorod metamaterials for biosensing
Nature Materials, 2009Co-Authors: A Kabashin, Paul R Evans, S Pastkovsky, William Hendren, Gregory A Wurtz, R Atkinson, R J Pollard, Viktor A PodolskiyAbstract:Plasmonic biosensors are either based on freely propagating surface Plasmons or Plasmons localized at nanostructures. Despite advantages such as quantitative detection, localized surface-plasmon sensors have shown lower overall sensitivities. A nanorod metamaterial supporting new plasmonic modes is now shown to considerably outperform earlier plasmonic biosensors by combining and expanding their respective advantages.
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plasmonic nanorod metamaterials for biosensing
Nature Materials, 2009Co-Authors: A Kabashin, Paul R Evans, S Pastkovsky, William Hendren, Gregory A Wurtz, R Atkinson, Robert Pollard, Viktor A PodolskiyAbstract:Plasmonic biosensors are either based on freely propagating surface Plasmons or Plasmons localized at nanostructures. Despite advantages such as quantitative detection, localized surface-plasmon sensors have shown lower overall sensitivities. A nanorod metamaterial supporting new plasmonic modes is now shown to considerably outperform earlier plasmonic biosensors by combining and expanding their respective advantages. Label-free plasmonic biosensors rely either on surface plasmon polaritons or on localized surface Plasmons on continuous or nanostructured noble-metal surfaces to detect molecular-binding events1,2,3,4. Despite undisputed advantages, including spectral tunability3, strong enhancement of the local electric field5,6 and much better adaptability to modern nanobiotechnology architectures7, localized Plasmons demonstrate orders of magnitude lower sensitivity compared with their guided counterparts3. Here, we demonstrate an improvement in biosensing technology using a plasmonic metamaterial that is capable of supporting a guided mode in a porous nanorod layer. Benefiting from a substantial overlap between the probing field and the active biological substance incorporated between the nanorods and a strong plasmon-mediated energy confinement inside the layer, this metamaterial provides an enhanced sensitivity to refractive-index variations of the medium between the rods (more than 30,000 nm per refractive-index unit). We demonstrate the feasibility of our approach using a standard streptavidin–biotin affinity model and record considerable improvement in the detection limit of small analytes compared with conventional label-free plasmonic devices.
Viktor A Podolskiy - One of the best experts on this subject based on the ideXlab platform.
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plasmonic nanorod metamaterials for biosensing
Nature Materials, 2009Co-Authors: A Kabashin, Paul R Evans, S Pastkovsky, William Hendren, Gregory A Wurtz, R Atkinson, R J Pollard, Viktor A PodolskiyAbstract:Plasmonic biosensors are either based on freely propagating surface Plasmons or Plasmons localized at nanostructures. Despite advantages such as quantitative detection, localized surface-plasmon sensors have shown lower overall sensitivities. A nanorod metamaterial supporting new plasmonic modes is now shown to considerably outperform earlier plasmonic biosensors by combining and expanding their respective advantages.
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plasmonic nanorod metamaterials for biosensing
Nature Materials, 2009Co-Authors: A Kabashin, Paul R Evans, S Pastkovsky, William Hendren, Gregory A Wurtz, R Atkinson, Robert Pollard, Viktor A PodolskiyAbstract:Plasmonic biosensors are either based on freely propagating surface Plasmons or Plasmons localized at nanostructures. Despite advantages such as quantitative detection, localized surface-plasmon sensors have shown lower overall sensitivities. A nanorod metamaterial supporting new plasmonic modes is now shown to considerably outperform earlier plasmonic biosensors by combining and expanding their respective advantages. Label-free plasmonic biosensors rely either on surface plasmon polaritons or on localized surface Plasmons on continuous or nanostructured noble-metal surfaces to detect molecular-binding events1,2,3,4. Despite undisputed advantages, including spectral tunability3, strong enhancement of the local electric field5,6 and much better adaptability to modern nanobiotechnology architectures7, localized Plasmons demonstrate orders of magnitude lower sensitivity compared with their guided counterparts3. Here, we demonstrate an improvement in biosensing technology using a plasmonic metamaterial that is capable of supporting a guided mode in a porous nanorod layer. Benefiting from a substantial overlap between the probing field and the active biological substance incorporated between the nanorods and a strong plasmon-mediated energy confinement inside the layer, this metamaterial provides an enhanced sensitivity to refractive-index variations of the medium between the rods (more than 30,000 nm per refractive-index unit). We demonstrate the feasibility of our approach using a standard streptavidin–biotin affinity model and record considerable improvement in the detection limit of small analytes compared with conventional label-free plasmonic devices.
Gregory A Wurtz - One of the best experts on this subject based on the ideXlab platform.
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plasmonic nanorod metamaterials for biosensing
Nature Materials, 2009Co-Authors: A Kabashin, Paul R Evans, S Pastkovsky, William Hendren, Gregory A Wurtz, R Atkinson, R J Pollard, Viktor A PodolskiyAbstract:Plasmonic biosensors are either based on freely propagating surface Plasmons or Plasmons localized at nanostructures. Despite advantages such as quantitative detection, localized surface-plasmon sensors have shown lower overall sensitivities. A nanorod metamaterial supporting new plasmonic modes is now shown to considerably outperform earlier plasmonic biosensors by combining and expanding their respective advantages.
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plasmonic nanorod metamaterials for biosensing
Nature Materials, 2009Co-Authors: A Kabashin, Paul R Evans, S Pastkovsky, William Hendren, Gregory A Wurtz, R Atkinson, Robert Pollard, Viktor A PodolskiyAbstract:Plasmonic biosensors are either based on freely propagating surface Plasmons or Plasmons localized at nanostructures. Despite advantages such as quantitative detection, localized surface-plasmon sensors have shown lower overall sensitivities. A nanorod metamaterial supporting new plasmonic modes is now shown to considerably outperform earlier plasmonic biosensors by combining and expanding their respective advantages. Label-free plasmonic biosensors rely either on surface plasmon polaritons or on localized surface Plasmons on continuous or nanostructured noble-metal surfaces to detect molecular-binding events1,2,3,4. Despite undisputed advantages, including spectral tunability3, strong enhancement of the local electric field5,6 and much better adaptability to modern nanobiotechnology architectures7, localized Plasmons demonstrate orders of magnitude lower sensitivity compared with their guided counterparts3. Here, we demonstrate an improvement in biosensing technology using a plasmonic metamaterial that is capable of supporting a guided mode in a porous nanorod layer. Benefiting from a substantial overlap between the probing field and the active biological substance incorporated between the nanorods and a strong plasmon-mediated energy confinement inside the layer, this metamaterial provides an enhanced sensitivity to refractive-index variations of the medium between the rods (more than 30,000 nm per refractive-index unit). We demonstrate the feasibility of our approach using a standard streptavidin–biotin affinity model and record considerable improvement in the detection limit of small analytes compared with conventional label-free plasmonic devices.
Philippe Lalanne - One of the best experts on this subject based on the ideXlab platform.
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plasmon switching observation of dynamic surface plasmon steering by selective mode excitation in a sub wavelength slit
Optics Express, 2012Co-Authors: Shreyas B Raghunathan, Philippe Lalanne, Hugo F Schouten, W Ubachs, Choon How Gan, T Van Dijk, Ea B Kim, Taco D VisserAbstract:We report a plasmon steering method that enables us to dynamically control the direction of surface Plasmons generated by a two-mode slit in a thin metal film. By varying the phase between different coherent beams that are incident on the slit, individual waveguide modes are excited. Different linear combinations of the two modes lead to different diffracted fields at the exit of the slit. As a result, the direction in which surface Plasmons are launched can be controlled. Experiments confirm that it is possible to distribute an approximately constant surface plasmon intensity in any desired proportion over the two launching directions. We also find that the anti-symmetric mode generates surface Plasmons more efficiently than the fundamental symmetric mode.
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plasmon switching observation of dynamic surface plasmon steering by selective mode excitation in a sub wavelength slit
Optics Express, 2012Co-Authors: Shreyas B Raghunathan, Philippe Lalanne, T Van Dijk, Hugo F Schouten, W Ubachs, Taco D VisserAbstract:We report a plasmon steering method that enables us to dynamically control the direction of surface Plasmons generated by a two-mode slit in a thin metal film. By varying the phase between different coherent beams that are incident on the slit, individual waveguide modes are excited. Different linear combinations of the two modes lead to different diffracted fields at the exit of the slit. As a result, the direction in which surface Plasmons are launched can be controlled. Experiments confirm that it is possible to distribute an approximately constant surface plasmon intensity in any desired proportion over the two launching directions. We also find that the anti-symmetric mode generates surface Plasmons more efficiently than the fundamental symmetric mode.
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Plasmon switching: observation of dynamic surface plasmon steering by selective mode excitation in a subwavelength slit
Optics Express, 2012Co-Authors: Shreyas B Raghunathan, Philippe Lalanne, Hugo F Schouten, W Ubachs, Choon How Gan, T Van Dijk, Buntha Ea-kim, Taco D VisserAbstract:We report a plasmon steering method that enables us to dynamically control the direction of surface Plasmons generated by a two-mode slit in a thin metal film. By varying the phase between different coherent beams that are incident on the slit, individual waveguide modes are excited. Different linear combinations of the two modes lead to different diffracted fields at the exit of the slit. As a result, the direction in which surface Plasmons are launched can be controlled. Experiments confirm that it is possible to distribute an approximately constant surface plasmon intensity in any desired proportion over the two launching directions. We also find that the anti-symmetric mode generates surface Plasmons more efficiently than the fundamental symmetric mode.
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Negative Role of Surface Plasmons in the Transmission of Metallic Gratings with Very Narrow Slits
Physical Review Letters, 2002Co-Authors: Qing Cao, Philippe LalanneAbstract:It is generally admitted that the extraordinary transmission of metallic grating with very narrow slits is mainly due to the excitation of surface Plasmons on the upper and lower interfaces of the grating. We show that the surface plasmon contribution is not the prime effect and that waveguide mode resonance and diffraction are responsible for the extraordinary transmission. Additionally and surprisingly, we reveal that the transmittance of subwavelength metallic gratings is always nearly zero for frequencies corresponding to surface plasmon excitation. This finding implies that surface Plasmons play a negative role in the transmission.
Taco D Visser - One of the best experts on this subject based on the ideXlab platform.
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plasmon switching observation of dynamic surface plasmon steering by selective mode excitation in a sub wavelength slit
Optics Express, 2012Co-Authors: Shreyas B Raghunathan, Philippe Lalanne, T Van Dijk, Hugo F Schouten, W Ubachs, Taco D VisserAbstract:We report a plasmon steering method that enables us to dynamically control the direction of surface Plasmons generated by a two-mode slit in a thin metal film. By varying the phase between different coherent beams that are incident on the slit, individual waveguide modes are excited. Different linear combinations of the two modes lead to different diffracted fields at the exit of the slit. As a result, the direction in which surface Plasmons are launched can be controlled. Experiments confirm that it is possible to distribute an approximately constant surface plasmon intensity in any desired proportion over the two launching directions. We also find that the anti-symmetric mode generates surface Plasmons more efficiently than the fundamental symmetric mode.
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plasmon switching observation of dynamic surface plasmon steering by selective mode excitation in a sub wavelength slit
Optics Express, 2012Co-Authors: Shreyas B Raghunathan, Philippe Lalanne, Hugo F Schouten, W Ubachs, Choon How Gan, T Van Dijk, Ea B Kim, Taco D VisserAbstract:We report a plasmon steering method that enables us to dynamically control the direction of surface Plasmons generated by a two-mode slit in a thin metal film. By varying the phase between different coherent beams that are incident on the slit, individual waveguide modes are excited. Different linear combinations of the two modes lead to different diffracted fields at the exit of the slit. As a result, the direction in which surface Plasmons are launched can be controlled. Experiments confirm that it is possible to distribute an approximately constant surface plasmon intensity in any desired proportion over the two launching directions. We also find that the anti-symmetric mode generates surface Plasmons more efficiently than the fundamental symmetric mode.
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Plasmon switching: observation of dynamic surface plasmon steering by selective mode excitation in a subwavelength slit
Optics Express, 2012Co-Authors: Shreyas B Raghunathan, Philippe Lalanne, Hugo F Schouten, W Ubachs, Choon How Gan, T Van Dijk, Buntha Ea-kim, Taco D VisserAbstract:We report a plasmon steering method that enables us to dynamically control the direction of surface Plasmons generated by a two-mode slit in a thin metal film. By varying the phase between different coherent beams that are incident on the slit, individual waveguide modes are excited. Different linear combinations of the two modes lead to different diffracted fields at the exit of the slit. As a result, the direction in which surface Plasmons are launched can be controlled. Experiments confirm that it is possible to distribute an approximately constant surface plasmon intensity in any desired proportion over the two launching directions. We also find that the anti-symmetric mode generates surface Plasmons more efficiently than the fundamental symmetric mode.
