The Experts below are selected from a list of 78585 Experts worldwide ranked by ideXlab platform

Xiang Zhang - One of the best experts on this subject based on the ideXlab platform.

  • large positive and negative lateral optical beam displacements due to Surface Plasmon Resonance
    Applied Physics Letters, 2004
    Co-Authors: Lambertus Hesselink, Nicholas X Fang, Xiang Zhang
    Abstract:

    We report abnormally large positive and negative lateral optical beam shifts at a metal–air interface when the Surface Plasmon Resonance of the metal is excited. The optimal thickness for minimal resonant reflection is identified as the critical thickness above which a negative beam displacement is observed. Experimental results show good agreement with theoretical predictions and the large observed bidirectional beam displacements also indicate the existence of forward and backward Surface propagating waves at the Surface Plasmon Resonance of the metal.

  • large positive and negative lateral optical beam displacements due to Surface Plasmon Resonance
    Applied Physics Letters, 2004
    Co-Authors: Xiaobo Yin, Lambertus Hesselink, Nicholas X Fang, Zhaowei Liu, Xiang Zhang
    Abstract:

    We report abnormally large positive and negative lateral optical beam shifts at a metal–air interface when the Surface Plasmon Resonance of the metal is excited. The optimal thickness for minimal resonant reflection is identified as the critical thickness above which a negative beam displacement is observed. Experimental results show good agreement with theoretical predictions and the large observed bidirectional beam displacements also indicate the existence of forward and backward Surface propagating waves at the Surface Plasmon Resonance of the metal.

Lambertus Hesselink - One of the best experts on this subject based on the ideXlab platform.

  • large positive and negative lateral optical beam displacements due to Surface Plasmon Resonance
    Applied Physics Letters, 2004
    Co-Authors: Lambertus Hesselink, Nicholas X Fang, Xiang Zhang
    Abstract:

    We report abnormally large positive and negative lateral optical beam shifts at a metal–air interface when the Surface Plasmon Resonance of the metal is excited. The optimal thickness for minimal resonant reflection is identified as the critical thickness above which a negative beam displacement is observed. Experimental results show good agreement with theoretical predictions and the large observed bidirectional beam displacements also indicate the existence of forward and backward Surface propagating waves at the Surface Plasmon Resonance of the metal.

  • large positive and negative lateral optical beam displacements due to Surface Plasmon Resonance
    Applied Physics Letters, 2004
    Co-Authors: Xiaobo Yin, Lambertus Hesselink, Nicholas X Fang, Zhaowei Liu, Xiang Zhang
    Abstract:

    We report abnormally large positive and negative lateral optical beam shifts at a metal–air interface when the Surface Plasmon Resonance of the metal is excited. The optimal thickness for minimal resonant reflection is identified as the critical thickness above which a negative beam displacement is observed. Experimental results show good agreement with theoretical predictions and the large observed bidirectional beam displacements also indicate the existence of forward and backward Surface propagating waves at the Surface Plasmon Resonance of the metal.

Amanda J Haes - One of the best experts on this subject based on the ideXlab platform.

  • localized Surface Plasmon Resonance biosensors
    Nanomedicine: Nanotechnology Biology and Medicine, 2006
    Co-Authors: Jing Zhao, Xiaoyu Zhang, Chanda Ranjit Yonzon, Amanda J Haes
    Abstract:

    In this review, the most recent progress in the development of noble metal nano-optical sensors based on localized Surface Plasmon Resonance (LSPR) spectroscopy is summarized. The sensing principle relies on the LSPR spectral shifts caused by the surrounding dielectric environmental change in a binding event. Nanosphere lithography, an inexpensive and simple nanofabrication technique, has been used to fabricate the nanoparticles as the LSPR sensing platforms. As an example of the biosensing applications, the LSPR detection for a biomarker of Alzheimer's disease, amyloid-derived diffusable ligands, in human brain extract and cerebrospinal fluid samples is highlighted. Furthermore, the LSPR sensing method can be modified easily and used in a variety of applications. More specifically, a LSPR chip capable of multiplex sensing, a combined electrochemical and LSPR protocol and a fabrication method of solution-phase nanotriangles are presented here.

  • localized Surface Plasmon Resonance spectroscopy near molecular Resonances
    Journal of the American Chemical Society, 2006
    Co-Authors: Amanda J Haes, Jing Zhao, Shengli Zou, George C Schatz
    Abstract:

    The peak location of the localized Surface Plasmon Resonance (LSPR) of noble metal nanoparticles is highly dependent upon the refractive index of the nanoparticles' surrounding environment. In this study, new phenomena are revealed by exploring the influence of interacting molecular Resonances and nanoparticle Resonances. The LSPR peak shift and line shape induced by a resonant molecule vary with wavelength. In most instances, the oscillatory dependence of the peak shift on wavelength tracks with the wavelength dependence of the real part of the refractive index, as determined by a Kramers−Kronig transformation of the molecular Resonance absorption spectrum. A quantitative assessment of this shift based on discrete dipole approximation calculations shows that the Kramers−Kronig index must be scaled in order to match experiment.

  • a unified view of propagating and localized Surface Plasmon Resonance biosensors
    Analytical and Bioanalytical Chemistry, 2004
    Co-Authors: Amanda J Haes, Richard P Van Duyne
    Abstract:

    The intense colors of noble metal nanoparticles have inspired artists and fascinated scientists for hundreds of years. In this review, we describe refractive index sensing platforms based on the tunability of the localized Surface Plasmon Resonance (LSPR) of arrays of silver nanoparticles and of single nanoparticles. Specifically, the color associated with single nanoparticles and Surface-confined nanoparticle arrays will be shown to be tunable and useful as platforms for chemical and biological sensing. Finally, the LSPR nanosensor will be compared to traditional, flat Surface, propagating Surface Plasmon Resonance sensors.

  • preliminary studies and potential applications of localized Surface Plasmon Resonance spectroscopy in medical diagnostics
    Expert Review of Molecular Diagnostics, 2004
    Co-Authors: Amanda J Haes
    Abstract:

    Miniature optical sensors that specifically identify low concentrations of environmental and biological substances are in high demand. Currently, there is no optical sensor that provides identification of the aforementioned species without amplification techniques at naturally occurring concentrations. Recently, it has been demonstrated that triangular silver nanoparticles have remarkable optical properties and that their enhanced sensitivity to their nanoenvironment has been used to develop a new class of optical sensors using localized Surface Plasmon Resonance spectroscopy. The examination of both model and nonmodel biological assays using localized Surface Plasmon Resonance spectroscopy will be presented in this review. It will be demonstrated that the use of a localized Surface Plasmon Resonance nanosensor rivals the sensitivity and selectivity of, and provides a low-cost alternative to, commercially available sensors.

Jiri Ctyroky - One of the best experts on this subject based on the ideXlab platform.

  • Novel spectral fiber optic sensor based on Surface Plasmon Resonance
    Europt(r)ode V-Opt(r)ode 2000, 2001
    Co-Authors: Radan Slavik, Jiří Tyroký, Jiri Ctyroky, Eduard Brynda
    Abstract:

    A novel fiber optic Surface Plasmon Resonance (SPR) sensing device based on spectral interrogation of SPR in a miniature fiber optic sensing element using depolarized light is reported. Optimization analysis of the sensor based on the equivalent planar waveguide approach and the mode expansion and propagation method is presented. A laboratory prototype of the sensor has been proved to be able to measure refractive index variations as small as 510-7. Suitability of the sensor for biosensing has been demonstrated by detecting IgG via respective monoclonal antibodies immobilized on the SPR sensor Surface

  • single mode optical fiber Surface Plasmon Resonance sensor
    Sensors and Actuators B-chemical, 1999
    Co-Authors: Radan Slavik, Jiři Homola, Jiri Ctyroky
    Abstract:

    Abstract A fiber optic Surface Plasmon Resonance (SPR) sensor utilizing the resonant interaction between a guided mode of a single-mode optical fiber and a Surface plasma wave supported by a thin metal film is described. Theoretical analysis of the SPR sensing structure based on the equivalent planar waveguide approach and the mode expansion and propagation method is presented. A detailed analysis of the effect of the major parameters of the SPR sensing structure on the sensor performance is carried out. Experimental results obtained with fabricated laboratory prototypes of the SPR sensing device for measurement of the refractive index of analyte are reported. It has been demonstrated that the fiber optic SPR sensing device may be used as a spectral as well as an amplitude sensor.

  • tuning of spectral operation range of a waveguide Surface Plasmon Resonance sensor
    Electronics Letters, 1997
    Co-Authors: Jiri Ctyroky, Jiři Homola, M Skalsky
    Abstract:

    The spectral properties of a Surface Plasmon Resonance sensor based on a planar ion-exchange glass waveguide with a thin gold layer are investigated both theoretically and experimentally. It is demonstrated that the spectral operation region of the sensor can be adjusted in quite a large range by a thin high-index overlayer.

Radan Slavik - One of the best experts on this subject based on the ideXlab platform.

  • Novel spectral fiber optic sensor based on Surface Plasmon Resonance
    Europt(r)ode V-Opt(r)ode 2000, 2001
    Co-Authors: Radan Slavik, Jiří Tyroký, Jiri Ctyroky, Eduard Brynda
    Abstract:

    A novel fiber optic Surface Plasmon Resonance (SPR) sensing device based on spectral interrogation of SPR in a miniature fiber optic sensing element using depolarized light is reported. Optimization analysis of the sensor based on the equivalent planar waveguide approach and the mode expansion and propagation method is presented. A laboratory prototype of the sensor has been proved to be able to measure refractive index variations as small as 510-7. Suitability of the sensor for biosensing has been demonstrated by detecting IgG via respective monoclonal antibodies immobilized on the SPR sensor Surface

  • single mode optical fiber Surface Plasmon Resonance sensor
    Sensors and Actuators B-chemical, 1999
    Co-Authors: Radan Slavik, Jiři Homola, Jiri Ctyroky
    Abstract:

    Abstract A fiber optic Surface Plasmon Resonance (SPR) sensor utilizing the resonant interaction between a guided mode of a single-mode optical fiber and a Surface plasma wave supported by a thin metal film is described. Theoretical analysis of the SPR sensing structure based on the equivalent planar waveguide approach and the mode expansion and propagation method is presented. A detailed analysis of the effect of the major parameters of the SPR sensing structure on the sensor performance is carried out. Experimental results obtained with fabricated laboratory prototypes of the SPR sensing device for measurement of the refractive index of analyte are reported. It has been demonstrated that the fiber optic SPR sensing device may be used as a spectral as well as an amplitude sensor.