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Single Nanoparticle Detected

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ST. LOUIS, Dec. 21, 2009 -- Nanoparticles can be found just about everywhere these days: in makeup, sunscreen, home pregnancy tests, anti-odor socks, plastic beer bottles, antibacterial doorknobs, and plastic bags for storing vegetables, just to name a few of the 800 or so products on the market. But how safe are they really? A research group at Washington University aims to assess the impact of nanoparticles on the environment and human health before they are sent to market. As part of this effort, a team led by Lan Yang, PhD, assistant professor of electrical and systems engineering, has devised a sensor on a chip...Read full article

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    Published: December 2009
    Glossary
    frequency
    With reference to electromagnetic radiation, the number of crests of waves that pass a fixed point in a given unit of time, in light or other wave motion. Expressed in hertz or cycles per second.
    light
    Electromagnetic radiation detectable by the eye, ranging in wavelength from about 400 to 750 nm. In photonic applications light can be considered to cover the nonvisible portion of the spectrum which includes the ultraviolet and the infrared.
    mode
    1. The characteristic of how light propagates through a waveguide that can be designated by a radiation pattern in a plane transverse to the direction of travel. 2. The state of an oscillating system such as a laser that corresponds to both a particular field pattern the system generates as well as one of the possible resonant frequencies of the system. In a laser system, the field pattern produced as described above is referred to as a transverse mode and takes the common name(s) Gaussian,...
    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.
    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.
    nanotechnology
    The use of atoms, molecules and molecular-scale structures to enhance existing technology and develop new materials and devices. The goal of this technology is to manipulate atomic and molecular particles to create devices that are thousands of times smaller and faster than those of the current microtechnologies.
    optical
    Pertaining to optics and the phenomena of light.
    photonics
    The technology of generating and harnessing light and other forms of radiant energy whose quantum unit is the photon. The science includes light emission, transmission, deflection, amplification and detection by optical components and instruments, lasers and other light sources, fiber optics, electro-optical instrumentation, related hardware and electronics, and sophisticated systems. The range of applications of photonics extends from energy generation to detection to communications and...
    resonator
    A resonator is a device or system that exhibits resonance, which is a phenomenon that occurs when an external force or stimulus is applied at a specific frequency, causing the system to oscillate with increased amplitude. Resonators are found in various fields and can take different forms depending on the type of waves involved, such as mechanical waves, acoustic waves, electromagnetic waves, or optical waves. Key points about resonators: Resonance: Resonance is a condition where a...
    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.
    BiophotonicsBusinessDaren Chendetectionfiber opticsfrequencyImagingJiangang ZhuLan YanglightmicroresonatormodenanonanoparticlenanotechnologyNature PhotonicsNews & Featuresopticalphotonicspulsed lasersResearch & Technologyresonatorscatteringsensor on a chipSensors & DetectorssplittingTest & Measurementultrahigh-QWashington Universitywhispering galleryLasers

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