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Rationally designing plasmonic devices using imaging and simulation

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Hank Hogan, [email protected]

Researchers intent on building plasmonic sensors to a set of specifications now have a new tool to help in that quest, according to a group of investigators. The team has demonstrated that electron tomography and electrodynamic simulations can create an accurate optical model of highly irregular gold nanoparticles, the heart of many plasmonic sensors. The method could prove a powerful aid in designing devices to detect the faintest of substances, said researcher Eduardo A. Coronado. “The ultimate goal is to have a very precise optical characterization of real nanoparticles to...Read full article

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    Published: August 2010
    Glossary
    atomic force microscope
    An atomic force microscope (AFM) is a high-resolution imaging and measurement instrument used in nanotechnology, materials science, and biology. It is a type of scanning probe microscope that operates by scanning a sharp tip (usually a few nanometers in diameter) over the surface of a sample at a very close distance. The tip interacts with the sample's surface forces, providing detailed information about the sample's topography and properties at the nanoscale. Key features and principles of...
    fluorescence
    Fluorescence is a type of luminescence, which is the emission of light by a substance that has absorbed light or other electromagnetic radiation. Specifically, fluorescence involves the absorption of light at one wavelength and the subsequent re-emission of light at a longer wavelength. The emitted light occurs almost instantaneously and ceases when the excitation light source is removed. Key characteristics of fluorescence include: Excitation and emission wavelengths: Fluorescent materials...
    fluorescence microscopy
    Fluorescence microscopy is a specialized optical imaging technique used in biology, chemistry, and materials science to visualize and study specimens that exhibit fluorescence. Fluorescence is the phenomenon where a substance absorbs light at one wavelength and emits light at a longer wavelength. In fluorescence microscopy, fluorescent dyes or proteins are used to label specific structures or molecules within a sample. The basic principles of fluorescence microscopy involve illuminating the...
    nanometer
    A unit of length in the metric system equal to 10-9 meters. It formerly was called a millimicron.
    nanoparticle
    A small object that behaves as a whole unit or entity in terms of it's transport and it's properties, as opposed to an individual molecule which on it's own is not considered a nanoparticle.. Nanoparticles range between 100 and 2500 nanometers in diameter.
    optical
    Pertaining to optics and the phenomena of light.
    probe
    Acronym for profile resolution obtained by excitation. In its simplest form, probe involves the overlap of two counter-propagating laser pulses of appropriate wavelength, such that one pulse selectively populates a given excited state of the species of interest while the other measures the increase in absorption due to the increase in the degree of excitation.
    raman spectroscopy
    Raman spectroscopy is a technique used in analytical chemistry and physics to study vibrational, rotational, and other low-frequency modes in a system. Named after the Indian physicist Sir C.V. Raman who discovered the phenomenon in 1928, Raman spectroscopy provides information about molecular vibrations by measuring the inelastic scattering of monochromatic light. Here is a breakdown of the process: Incident light: A monochromatic (single wavelength) light, usually from a laser, is...
    sensor
    1. A generic term for detector. 2. A complete optical/mechanical/electronic system that contains some form of radiation detector.
    3-DArgentinaatomic force microscopeBasic ScienceBiophotonicschemicaldipoleDNADNA sequencingEduardo Coronadoelectrodynamicelectrodynamic simulationelectron microscopyelectron tomographyfluorescencefluorescence microscopygold nanoparticleHank HoganImagingMicroscopymoleculenanometernanoparticleopticalOpticsparticlePaul MidgleyPCRplasmonic sensorspolymerase chain reactionprobeRaman spectroscopyResearch & TechnologysensorSensors & DetectorssequencesignalSPHEREspheroidTech Pulsethree-dimensionalUniversity of Cambridge

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