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Tracking Particles With Gold Rods

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HOUSTON, Feb. 8, 2010 – A group of Rice University researchers, led by Stephan Link, has found a way to use nanometer-scale gold rods as orientation sensors by combining their plasmonic properties with polarization-imaging techniques. The work may make it possible to see and perhaps track single nanoparticles over long periods and give other scientists new information about materials, including living systems, that incorporate nanoparticles. “With a spherical particle, you don’t have any information about how it’s oriented,” said Link, an assistant professor of chemistry and electrical...Read full article

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    Published: February 2010
    Glossary
    absorption
    The transfer of energy from an incident electromagnetic energy field with wavelength or frequency to an atomic or molecular medium.
    nano
    An SI prefix meaning one billionth (10-9). Nano can also be used to indicate the study of atoms, molecules and other structures and particles on the nanometer scale. Nano-optics (also referred to as nanophotonics), for example, is the study of how light and light-matter interactions behave on the nanometer scale. See nanophotonics.
    plasmonics
    Plasmonics is a field of science and technology that focuses on the interaction between electromagnetic radiation and free electrons in a metal or semiconductor at the nanoscale. Specifically, plasmonics deals with the collective oscillations of these free electrons, known as surface plasmons, which can confine and manipulate light on the nanometer scale. Surface plasmons are formed when incident photons couple with the conduction electrons at the interface between a metal or semiconductor...
    polarization
    Polarization refers to the orientation of oscillations in a transverse wave, such as light waves, radio waves, or other electromagnetic waves. In simpler terms, it describes the direction in which the electric field vector of a wave vibrates. Understanding polarization is important in various fields, including optics, telecommunications, and physics. Key points about polarization: Transverse waves: Polarization is a concept associated with transverse waves, where the oscillations occur...
    quantum dots
    A quantum dot is a nanoscale semiconductor structure, typically composed of materials like cadmium selenide or indium arsenide, that exhibits unique quantum mechanical properties. These properties arise from the confinement of electrons within the dot, leading to discrete energy levels, or "quantization" of energy, similar to the behavior of individual atoms or molecules. Quantum dots have a size on the order of a few nanometers and can emit or absorb photons (light) with precise wavelengths,...
    scattering
    Change of the spatial distribution of a beam of radiation when it interacts with a surface or a heterogeneous medium, in which process there is no change of wavelength of the radiation.
    absorptionBasic Sciencebiocompatiblebiological applicationsBiophotonicselectron microscopyfluorescentfluorophoresgoldHoustonImagingJennifer Westmaterials researchMicroscopynanonanoparticlesNanorodsNaomi HalasOpticsphotothermal imagingplasmonicsplasmonsPNASpolarizationpolarization-imagingprobe laserProceedings of the National Academy of Sciencesquantum dotsResearch & TechnologyRice Universityscanning tunneling microscopyscatteringSensors & DetectorssignalStephan LinkSTMsurface plasmonsTexasWei-Shun ChangLasers

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